Willkens; Craig A.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Willkens; Craig A..The latest application filed is for "partially stabilized zirconia materials".
- Willkens; Craig A. - Sterling MA
- Willkens; Craig A. - Fort Wayne IN
- Willkens; Craig A. - Worcester MA
- Willkens; Craig A. - Webster MA
| Patent | Date |
|---|---|
| Ceramic igniters Grant 8,193,469 - Willkens June 5, 2 | 2012-06-05 |
| Partially Stabilized Zirconia Materials App 20100035747 - Zhao; Qiang ; et al. | 2010-02-11 |
| Ceramic igniters App 20080314890 - Willkens; Craig A. | 2008-12-25 |
| Injection molding of ceramic elements App 20080145672 - Willkens; Craig A. ; et al. | 2008-06-19 |
| Injection molding of ceramic elements App 20080116192 - Annavarapu; Suresh ; et al. | 2008-05-22 |
| Ceramic igniters Grant 7,329,837 - Willkens February 12, 2 | 2008-02-12 |
| Ceramic heating elements App 20070295709 - Willkens; Craig A. | 2007-12-27 |
| Compositions for ceramic igniters Grant 7,195,722 - Lin , et al. March 27, 2 | 2007-03-27 |
| Ceramic igniters App 20060201925 - Yu; Taehwan ; et al. | 2006-09-14 |
| Compositions for ceramic igniters App 20030160220 - Lin, Roger J. ; et al. | 2003-08-28 |
| Ceramic igniters App 20020150851 - Willkens, Craig A. | 2002-10-17 |
| Multiple Hot Zone Igniters App 20020113051 - Willkens, Craig A. ; et al. | 2002-08-22 |
| Aging resistant, porous silicon carbide ceramic igniter App 20020010067 - Willkens, Craig A. ; et al. | 2002-01-24 |
| Method of heating a stovetop range using a continuously energized ceramic igniter having relight capability Grant 6,002,107 - Willkens , et al. December 14, 1 | 1999-12-14 |
| Method of heating a stovetop range using a ceramic igniter Grant 5,892,201 - Croucher , et al. April 6, 1 | 1999-04-06 |
| Ceramic igniter with hot zone thickness of 0.019 inches or less Grant 5,801,361 - Willkens , et al. September 1, 1 | 1998-09-01 |
| Match head ceramic igniter and method of using same Grant 5,786,565 - Willkens , et al. July 28, 1 | 1998-07-28 |
| Silicon nitride having a high tensile strength Grant 5,759,481 - Pujari , et al. June 2, 1 | 1998-06-02 |
| Silicon nitride having a high tensile strength Grant 5,571,760 - Pujari , et al. November 5, 1 | 1996-11-05 |
| Composition for small ceramic igniters Grant 5,514,630 - Willkens , et al. May 7, 1 | 1996-05-07 |
| Pressure casting ceramic slurries Grant 5,229,339 - Pujari , et al. July 20, 1 | 1993-07-20 |
| Process for the manufacture of friable silicon nitride bodies Grant 5,061,416 - Willkens , et al. October 29, 1 | 1991-10-29 |
| Reaction bonded silicon nitride filtration membranes Grant 5,004,544 - Hay , et al. April 2, 1 | 1991-04-02 |
| Silicon nitride vacuum furnace process Grant 4,970,057 - Willkens , et al. November 13, 1 | 1990-11-13 |
| Fiber-reinforced silicon nitride composite ceramics Grant 4,885,199 - Corbin , et al. December 5, 1 | 1989-12-05 |
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