Patent | Date |
---|
Recurring Process For Laser Induced Forward Transfer And High Throughput And Recycling Of Donor Material By The Reuse Of A Plurality Of Target Substrate Plates Or Forward Transfer Of A Pattern Of Discrete Donor Dots App 20210339472 - SANDSTROM; Torbjorn ;   et al. | 2021-11-04 |
Switched Capacitor Arrangement For Tuning A Differential Circuit App 20210159854 - SJOLAND; Henrik ;   et al. | 2021-05-27 |
Switched capacitor arrangement for tuning a differential circuit Grant 10,951,165 - Sjoland , et al. March 16, 2 | 2021-03-16 |
Recurring process for laser induced forward transfer and high throughput and recycling of donor material by the reuse of a plurality of target substrate plates or forward transfer of a pattern of discrete donor dots Grant 10,857,732 - Sandstrom , et al. December 8, 2 | 2020-12-08 |
Switched Capacitor Arrangement For Tuning A Differential Circuit App 20200052648 - Sjoland; Henrik ;   et al. | 2020-02-13 |
Composition Of Solid-containing Paste App 20180257178 - Sandstrom; Torbjorn | 2018-09-13 |
Composition of solid-containing paste Grant 9,975,206 - Sandstrom May 22, 2 | 2018-05-22 |
Recurring Process For Laser Induced Forward Transfer And High Throughput And Recycling Of Donor Material By The Reuse Of A Plurality Of Target Substrate Plates Or Forward Transfer Of A Pattern Of Discrete Donor Dots App 20180015671 - SANDSTROM; Torbjorn ;   et al. | 2018-01-18 |
Mechanically produced alignment fiducial method and device Grant 9,459,540 - Sandstrom October 4, 2 | 2016-10-04 |
Lithographic Printing System With Placement Corrections App 20150323319 - SANDSTROM; Torbjorn | 2015-11-12 |
Method and device for writing photomasks with reduced mura errors Grant 9,164,373 - Sandstrom October 20, 2 | 2015-10-20 |
Optical writer for flexible foils Grant 9,090,095 - Sandstrom , et al. July 28, 2 | 2015-07-28 |
Multi-method and device with an advanced acousto-optic deflector (AOD) and a dense brush of flying spots Grant 8,958,052 - Sandstrom February 17, 2 | 2015-02-17 |
Method and device scanning a two-dimensional brush through an acousto-optic deflector (AOD) having an extended field in a scanning direction Grant 8,896,909 - Sandstrom , et al. November 25, 2 | 2014-11-25 |
Acousto-optic deflectors over one octave Grant 8,891,157 - Sandstrom November 18, 2 | 2014-11-18 |
Image reading and writing using a complex two-dimensional interlace scheme Grant 8,885,145 - Sandstrom November 11, 2 | 2014-11-11 |
Oversized micro-mechanical light modulator with redundant elements, device and method Grant 8,861,066 - Askebjer , et al. October 14, 2 | 2014-10-14 |
Mechanically Produced Alignment Fiducial Method And Device App 20140268088 - Sandstrom; Torbjorn | 2014-09-18 |
Method And Device For Writing Photomasks With Reduced Mura Errors App 20140272685 - SANDSTROM; Torbjorn | 2014-09-18 |
Writing apparatuses and methods Grant 8,822,879 - Stiblert , et al. September 2, 2 | 2014-09-02 |
Criss-cross writing strategy Grant 8,767,185 - Sandstrom July 1, 2 | 2014-07-01 |
1.5D SLM for lithography Grant 8,767,175 - Sandstrom July 1, 2 | 2014-07-01 |
Method and device using rotating printing arm to project or view image across a workpiece Grant 8,755,590 - Sandstrom , et al. June 17, 2 | 2014-06-17 |
Composition Of Solid-containing Paste App 20140150929 - Sandstrom; Torbjorn | 2014-06-05 |
Methods and device for laser processing Grant 8,743,165 - Sandstrom June 3, 2 | 2014-06-03 |
Lithographic Printing System With Placement Corrections App 20140049760 - Sandstrom; Torbjorn | 2014-02-20 |
Optical Writer For Flexible Foils App 20130335504 - Sandstrom; Torbjorn ;   et al. | 2013-12-19 |
Lithographic printing system with placement corrections Grant 8,570,613 - Sandstrom October 29, 2 | 2013-10-29 |
Method And Device Using Rotating Printing Arm To Project Or View Image Across A Workpiece App 20130250030 - Sandstrom; Torbjorn ;   et al. | 2013-09-26 |
Rotor optics imaging method and system with variable dose during sweep Grant 8,537,416 - Sandstrom , et al. September 17, 2 | 2013-09-17 |
SLM device and method combining multiple mirrors for high-power delivery Grant 8,531,755 - Sandstrom , et al. September 10, 2 | 2013-09-10 |
Image Reading And Writing Using A Complex Two-dimensional Interlace Scheme App 20130188166 - Sandstrom; Torbjorn | 2013-07-25 |
Rotor imaging system and method with variable-rate pixel clock Grant 8,472,089 - Sandstrom June 25, 2 | 2013-06-25 |
Method and apparatus for quantification of illumination non-uniformity in the mask plane of a lithographic exposure system Grant 8,456,613 - Sandstrom June 4, 2 | 2013-06-04 |
Method and device using rotating printing arm to project or view image across a workpiece Grant 8,442,302 - Sandstrom , et al. May 14, 2 | 2013-05-14 |
Image reading and writing using a complex two-dimensional interlace scheme Grant 8,351,020 - Sandstrom January 8, 2 | 2013-01-08 |
Criss-cross Writing Strategy App 20120307219 - Sandstrom; Torbjorn | 2012-12-06 |
Variable overlap method and device for stitching together lithographic stripes Grant 8,312,393 - Lindau , et al. November 13, 2 | 2012-11-13 |
Multi-Method and Device with an Advanced Acousto-Optic Deflector (AOD) and a Dense Brush of Flying Spots App 20120281195 - Sandstrom; Torbjorn | 2012-11-08 |
Method and Device Scanning a Two-Dimensional Brush Through an Acousto-Optic Deflector (AOD) Having an Extended Field in a Scanning Direction App 20120281271 - Sandstrom; Torbjorn ;   et al. | 2012-11-08 |
Acousto-optic Deflectors Over One Octave App 20120218623 - Sandstrom; Torbjorn | 2012-08-30 |
Method and apparatus for mura detection and metrology Grant 8,160,351 - Sandstrom , et al. April 17, 2 | 2012-04-17 |
Image forming method and apparatus Grant 8,144,307 - Sandstrom March 27, 2 | 2012-03-27 |
Platforms, apparatuses, systems and methods for processing and analyzing substrates Grant 8,122,846 - Stiblert , et al. February 28, 2 | 2012-02-28 |
Writing apparatuses and methods Grant 8,102,410 - Sandstrom January 24, 2 | 2012-01-24 |
Spatial light modulator with structured mirror surfaces Grant 8,077,377 - Sandstrom December 13, 2 | 2011-12-13 |
Method of iterative compensation for non-linear effects in three-dimensional exposure of resist Grant 8,067,134 - Sandstrom , et al. November 29, 2 | 2011-11-29 |
Method of compensation for bleaching of resist during three-dimensional exposure of resist Grant 8,057,971 - Sandstrom , et al. November 15, 2 | 2011-11-15 |
1.5d Slm For Lithography App 20110242514 - Sandstrom; Torbjorn | 2011-10-06 |
Methods and Device for Laser Processing App 20110240611 - Sandstrom; Torbjorn | 2011-10-06 |
Pattern generator Grant 7,957,055 - Sandstrom June 7, 2 | 2011-06-07 |
SLM lithography: printing to below K1=.30 without previous OPC processing Grant 7,934,172 - Ivonin , et al. April 26, 2 | 2011-04-26 |
Multi-focus method of enhanced three-dimensional exposure of resist Grant 7,923,182 - Sandstrom , et al. April 12, 2 | 2011-04-12 |
Writing apparatuses and methods App 20100308024 - Stiblert; Lars ;   et al. | 2010-12-09 |
Method and apparatus for personalization of semiconductor Grant 7,842,525 - Sandstrom November 30, 2 | 2010-11-30 |
Method and device for correcting SLM stamp image imperfections Grant 7,842,926 - Olsson , et al. November 30, 2 | 2010-11-30 |
Method and device for optical determination of physical properties of features, not much larger than the optical wavelength used, on a test sample Grant 7,808,648 - Sandstrom October 5, 2 | 2010-10-05 |
Pattern generator Grant 7,800,815 - Sandstrom September 21, 2 | 2010-09-21 |
Statistical Illuminator App 20100225236 - Luberek; Jarek ;   et al. | 2010-09-09 |
Rotor Imaging System And Method With Variable-rate Pixel Clock App 20100225979 - Sandstrom; Torbjorn | 2010-09-09 |
Variable Overlap Method and Device for Stitching Together Lithographic Stripes App 20100229146 - Lindau; Sten ;   et al. | 2010-09-09 |
Rotor Optics Imaging Method and System with Variable Dose During Sweep App 20100225943 - Sandstrom; Torbjorn ;   et al. | 2010-09-09 |
Oversized micro-mechanical light modulator with redundant elements, device and method App 20100225992 - Askebjer; Per ;   et al. | 2010-09-09 |
Lithographic Printing System With Placement Corrections App 20100225974 - Sandstrom; Torbjorn | 2010-09-09 |
Pattern generator Grant 7,787,174 - Sandstrom August 31, 2 | 2010-08-31 |
SLM Device and Method App 20100208329 - Sandstrom; Torbjorn ;   et al. | 2010-08-19 |
Pattern generator App 20100208327 - Sandstrom; Torbjorn | 2010-08-19 |
Method for high precision printing of patterns Grant 7,755,657 - Sandstrom , et al. July 13, 2 | 2010-07-13 |
Method And Device Using Rotating Printing Arm To Project Or View Image Across A Workpiece App 20100142757 - Sandstrom; Torbjorn ;   et al. | 2010-06-10 |
Image Reading And Writing Using A Complex Two-dimensional Interlace Scheme App 20100127431 - Sandstrom; Torbjorn | 2010-05-27 |
Graphics engine for high precision lithography Grant 7,715,641 - Olsson , et al. May 11, 2 | 2010-05-11 |
Pattern generator Grant 7,710,634 - Sandstrom May 4, 2 | 2010-05-04 |
Pupil improvement of incoherent imaging systems for enhanced CD linearity Grant 7,705,963 - Sandstrom , et al. April 27, 2 | 2010-04-27 |
Multi-focus Method Of Enhanced Three-dimensional Exposure Of Resist App 20100099051 - Sandstrom; Torbjorn ;   et al. | 2010-04-22 |
Method Of Iterative Compensation For Non-linear Effects In Three-dimensional Exposure Of Resist App 20100099035 - Sandstrom; Torbjorn ;   et al. | 2010-04-22 |
Method Of Compensation For Bleaching Of Resist During Three-dimensional Exposure Of Resist App 20100099034 - Sandstrom; Torbjorn ;   et al. | 2010-04-22 |
Graphics engine for high precision lithography Grant 7,646,919 - Olsson , et al. January 12, 2 | 2010-01-12 |
Spatial Light Modulator with Structured Mirror Surfaces App 20090303571 - Sandstrom; Torbjorn | 2009-12-10 |
RET for optical maskless lithography Grant 7,618,751 - Sandstrom , et al. November 17, 2 | 2009-11-17 |
Data path for high performance pattern generator Grant 7,590,966 - Sandstrom , et al. September 15, 2 | 2009-09-15 |
Dual layer workpiece masking and manufacturing process Grant 7,588,870 - Sandstrom September 15, 2 | 2009-09-15 |
Method And Apparatus For Projection Printing App 20090213354 - Sandstrom; Torbjorn ;   et al. | 2009-08-27 |
Pattern generator App 20090191489 - Sandstrom; Torbjorn | 2009-07-30 |
Pattern generator App 20090147345 - Sandstrom; Torbjorn | 2009-06-11 |
Patterning apparatuses and methods for the same Grant 7,542,129 - Sandstrom June 2, 2 | 2009-06-02 |
Method for error reduction in lithography App 20090104549 - Sandstrom; Torbjorn ;   et al. | 2009-04-23 |
Image Forming Method And Apparatus App 20090066926 - Sandstrom; Torbjorn | 2009-03-12 |
Method And Apparatus For Mura Detection And Metrology App 20090028423 - Sandstrom; Torbjorn ;   et al. | 2009-01-29 |
Method And Apparatus For Quantification Of Illumination Non-uniformity In The Mask Plane Of A Lithographic Exposure System App 20080316457 - Sandstrom; Torbjorn | 2008-12-25 |
Image forming method and apparatus Grant 7,446,857 - Sandstrom November 4, 2 | 2008-11-04 |
Method for error reduction in lithography Grant 7,444,616 - Sandstrom , et al. October 28, 2 | 2008-10-28 |
Method And Device For Data Integrity Checking App 20080244371 - Sandstrom; Torbjorn ;   et al. | 2008-10-02 |
Method and apparatus for patterning a workpiece Grant 7,405,414 - Sandstrom July 29, 2 | 2008-07-29 |
Dual Layer Workpiece Masking And Manufacturing Process App 20080131821 - Sandstrom; Torbjorn | 2008-06-05 |
Method and device for correcting SLM stamp image imperfections App 20080127031 - Olsson; Martin ;   et al. | 2008-05-29 |
Method and device for data integrity checking Grant 7,369,962 - Sandstrom , et al. May 6, 2 | 2008-05-06 |
Pattern generator Grant 7,365,901 - Sandstrom April 29, 2 | 2008-04-29 |
Graphics Engine For High Precision Lithography App 20080080782 - Olsson; Martin ;   et al. | 2008-04-03 |
Pattern generator App 20080079922 - Sandstrom; Torbjorn | 2008-04-03 |
Graphics Engine For High Precision Lithography App 20080074700 - Olsson; Martin ;   et al. | 2008-03-27 |
Method and apparatus for personalization of semiconductor App 20080062389 - Sandstrom; Torbjorn | 2008-03-13 |
Platforms, apparatuses, systems and methods for processing and analyzing substrates App 20080032066 - Stiblert; Lars ;   et al. | 2008-02-07 |
Method and device for correcting SLM stamp image imperfections Grant 7,328,425 - Olsson , et al. February 5, 2 | 2008-02-05 |
Dual layer workpiece masking and manufacturing process Grant 7,323,291 - Sandstrom January 29, 2 | 2008-01-29 |
Slm Structure Comprising Semiconducting Material App 20070279777 - Sandstrom; Torbjorn | 2007-12-06 |
Graphics engine for high precision lithography Grant 7,302,111 - Olsson , et al. November 27, 2 | 2007-11-27 |
Method And Process For Immersion Exposure Of A Substrate App 20070269724 - Sandstrom; Torbjorn | 2007-11-22 |
Method And Apparatus For Recording Of Images And Study Of Surfaces App 20070252986 - Sandstrom; Torbjorn | 2007-11-01 |
SLM Lithography: Printing to below K1=.30 without previous OPC processing App 20070209029 - Ivonin; Igor ;   et al. | 2007-09-06 |
Image Forming Method and Apparatus App 20070206264 - Sandstrom; Torbjorn | 2007-09-06 |
Writing apparatuses and methods App 20070188591 - Sandstrom; Torbjorn | 2007-08-16 |
Method and apparatus for printing patterns with improved cd uniformity App 20070186207 - Sandstrom; Torbjorn | 2007-08-09 |
Writing apparatuses and methods App 20070182808 - Stiblert; Lars ;   et al. | 2007-08-09 |
Method for high precision printing of patterns App 20070165098 - Sandstrom; Torbjorn ;   et al. | 2007-07-19 |
Dual Layer Workpiece Masking and Manufacturing Process App 20070105058 - Sandstrom; Torbjorn | 2007-05-10 |
Image forming method and apparatus Grant 7,215,409 - Sandstrom May 8, 2 | 2007-05-08 |
Method and apparatus for personalization of semiconductor Grant 7,211,453 - Sandstrom May 1, 2 | 2007-05-01 |
Pattern generator diffractive mirror methods and systems Grant 7,184,192 - Sandstrom February 27, 2 | 2007-02-27 |
Methods and systems for improved boundary contrast Grant 7,158,280 - Sandstrom January 2, 2 | 2007-01-02 |
Dual layer workpiece masking and manufacturing process Grant 7,153,634 - Sandstrom December 26, 2 | 2006-12-26 |
Methods and systems for improved boundary contrast Grant 7,106,490 - Sandstrom September 12, 2 | 2006-09-12 |
Pattern generator diffractive mirror methods and systems App 20060187524 - Sandstrom; Torbjorn | 2006-08-24 |
Method and apparatus for personalization of semiconductor App 20060161254 - Sandstrom; Torbjorn | 2006-07-20 |
Pattern generator App 20060103914 - Sandstrom; Torbjorn | 2006-05-18 |
Pattern generator mirror configurations Grant 7,034,986 - Sandstrom April 25, 2 | 2006-04-25 |
Methods and systems for improved boundary contrast App 20060077506 - Sandstrom; Torbjorn | 2006-04-13 |
Phase-shifting optical maskless lithography enabling asics at the 65 and 45 NM nodes App 20060068334 - Sandstrom; Torbjorn ;   et al. | 2006-03-30 |
Pupil improvement of incoherent imaging systems for enhanced CD linearity App 20060054781 - Sandstrom; Torbjorn ;   et al. | 2006-03-16 |
Pattern generator Grant 7,009,753 - Sandstrom March 7, 2 | 2006-03-07 |
Patterning apparatuses and methods for the same App 20060039651 - Sandstrom; Torbjorn | 2006-02-23 |
Pattern generator mirror configurations Grant 6,987,599 - Sandstrom January 17, 2 | 2006-01-17 |
Multi-beam pattern generator Grant 6,975,443 - Sandstrom December 13, 2 | 2005-12-13 |
Method and apparatus of calibrating multi-position SLM elements Grant 6,965,119 - Sandstrom , et al. November 15, 2 | 2005-11-15 |
Pattern generator mirror configurations App 20050225836 - Sandstrom, Torbjorn | 2005-10-13 |
RET for optical maskless lithography App 20050219502 - Sandstrom, Torbjorn ;   et al. | 2005-10-06 |
Mask blank and a method for producing the same App 20050221199 - Sandstrom, Torbjorn | 2005-10-06 |
Alignment sensor Grant 6,950,194 - Sandstrom September 27, 2 | 2005-09-27 |
Method and device for correcting SLM stamp image imperfections App 20050186692 - Olsson, Martin ;   et al. | 2005-08-25 |
Method and device for data integrity checking App 20050177326 - Sandstrom, Torbjorn ;   et al. | 2005-08-11 |
Image forming method and apparatus App 20050168851 - Sandstrom, Torbjorn | 2005-08-04 |
Method and device for coherence reduction App 20050141583 - Sandstrom, Torbjorn | 2005-06-30 |
Homogenizer Grant 6,903,859 - Sandstrom June 7, 2 | 2005-06-07 |
Method involving a mask or a reticle App 20050112474 - Sandstrom, Torbjorn | 2005-05-26 |
High energy, low energy density, radiation-resistant optics used with micro-electromechanical devices Grant 6,891,655 - Grebinski , et al. May 10, 2 | 2005-05-10 |
Method and apparatus for patterning a workpiece App 20050084766 - Sandstrom, Torbjorn | 2005-04-21 |
Method for error reduction in lithography Grant 6,883,158 - Sandstrom , et al. April 19, 2 | 2005-04-19 |
Method and apparatus for personalization of semiconductor App 20050047543 - Sandstrom, Torbjorn | 2005-03-03 |
Method for error reduction in lithography App 20040268289 - Sandstrom, Torbjorn ;   et al. | 2004-12-30 |
Method for high precision printing of patterns Grant 6,833,854 - Sandstrom December 21, 2 | 2004-12-21 |
Method For High Precision Printing Of Patterns App 20040251430 - Sandstrom, Torbjorn | 2004-12-16 |
Dual layer workpiece masking and manufacturing process App 20040229169 - Sandstrom, Torbjorn | 2004-11-18 |
Homogenization of a spatially coherent radiation beam and printing and inspection, respectively, of a pattern on a workpiece Grant 6,819,490 - Sandstrom , et al. November 16, 2 | 2004-11-16 |
Pattern generator Grant 6,816,302 - Sandstrom , et al. November 9, 2 | 2004-11-09 |
Defective pixel compensation method Grant 6,813,062 - Sandstrom November 2, 2 | 2004-11-02 |
Method and apparatus for personalization of semiconductor Grant 6,813,058 - Sandstrom November 2, 2 | 2004-11-02 |
Pattern generator App 20040165170 - Sandstrom, Torbjorn | 2004-08-26 |
Data path for high performance pattern generator App 20040159636 - Sandstrom, Torbjorn ;   et al. | 2004-08-19 |
High energy, low energy density, radiation-resistant optics used with micro-electromechical devices App 20040130775 - Grebinski, Thomas J. ;   et al. | 2004-07-08 |
Pattern generator Grant 6,747,783 - Sandstrom June 8, 2 | 2004-06-08 |
Data path for high performance pattern generator Grant 6,717,097 - Sandstrom , et al. April 6, 2 | 2004-04-06 |
Methods and systems for improved boundary contrast App 20040053143 - Sandstrom, Torbjorn | 2004-03-18 |
Defective pixel compensation method App 20040047023 - Sandstrom, Torbjorn | 2004-03-11 |
Pattern generation system using a spatial light modulator Grant 6,700,095 - Sandstrom , et al. March 2, 2 | 2004-03-02 |
Beam positioning in microlithography writing Grant 6,700,600 - Sandstrom , et al. March 2, 2 | 2004-03-02 |
Pattern generator using EUV Grant 6,687,041 - Sandstrom February 3, 2 | 2004-02-03 |
Methods and systems for process control of corner feature embellishment App 20030233630 - Sandstrom, Torbjorn ;   et al. | 2003-12-18 |
Dual layer reticle blank and manufacturing process Grant 6,645,677 - Sandstrom November 11, 2 | 2003-11-11 |
Pattern generator mirror configurations App 20030202233 - Sandstrom, Torbjorn | 2003-10-30 |
Laser writer Grant 6,624,878 - Sandstrom , et al. September 23, 2 | 2003-09-23 |
Method and apparatus for microlithography Grant 6,624,880 - Sandstrom , et al. September 23, 2 | 2003-09-23 |
Defective pixel compensation method Grant 6,618,185 - Sandstrom September 9, 2 | 2003-09-09 |
Graphics engine for high precision lithography App 20030160980 - Olsson, Martin ;   et al. | 2003-08-28 |
Reticle and direct lithography writing strategy Grant 6,605,816 - Sandstrom August 12, 2 | 2003-08-12 |
Multi-beam pattern generator App 20030140806 - Sandstrom, Torbjorn | 2003-07-31 |
Homogenizer App 20030123152 - Sandstrom, Torbjorn | 2003-07-03 |
Defective Pixel Compensation Method App 20030099026 - Sandstrom, Torbjorn | 2003-05-29 |
Method and apparatus using an SLM App 20030081303 - Sandstrom, Torbjorn ;   et al. | 2003-05-01 |
Homogenization of a spatially coherent radiation beam and printing and inspection, respectively, of a pattern on a workpiece App 20030071204 - Sandstrom, Torbjorn ;   et al. | 2003-04-17 |
Modulator design for pattern generator Grant 6,504,644 - Sandstrom January 7, 2 | 2003-01-07 |
Pattern generation system using a spatial light modulator App 20020153362 - Sandstrom, Torbjorn ;   et al. | 2002-10-24 |
Dual layer reticle blank and manufacturing process App 20020125443 - Sandstrom, Torbjorn | 2002-09-12 |
Method for microlithographic writing with improved precision Grant 6,448,999 - Utterback , et al. September 10, 2 | 2002-09-10 |
Method and apparatus for spatial light modulation App 20020122237 - Sandstrom, Torbjorn ;   et al. | 2002-09-05 |
Method and apparatus for microlithography App 20020105629 - Sandstrom, Torbjorn ;   et al. | 2002-08-08 |
Method for pattern generation with improved image quality Grant 6,428,940 - Sandstrom August 6, 2 | 2002-08-06 |
Pattern generator with improved precision Grant 6,399,261 - Sandstrom June 4, 2 | 2002-06-04 |
Pattern generator with improved address resolution Grant 6,373,619 - Sandstrom April 16, 2 | 2002-04-16 |
Pattern generator App 20020024714 - Sandstrom, Torbjorn ;   et al. | 2002-02-28 |
Pattern generator for avoiding stitching errors Grant 6,285,488 - Sandstrom September 4, 2 | 2001-09-04 |
Method and instrument for detection of change of thickness or refractive index for a thin film substrate Grant 5,631,171 - Sandstrom , et al. May 20, 1 | 1997-05-20 |
Devices and methods for detection of an analyte based upon light interference Grant 5,494,829 - Sandstrom , et al. February 27, 1 | 1996-02-27 |