| Patent | Date |
|---|
Naphtholactam dyes and optical recording medium containing these dyes
Grant 4,939,012 - Dust , et al. July 3, 1 | 1990-07-03 |
Magnetic recording media
Grant 4,668,586 - Kohl , et al. May 26, 1 | 1987-05-26 |
Tape cassette containing echo-erasing means
Grant 4,656,548 - Pfefferkorn , et al. April 7, 1 | 1987-04-07 |
Production of magnetic recording media
Grant 4,472,455 - Kohl , et al. September 18, 1 | 1984-09-18 |
Document identification employing exchange-anisotropic magnetic material
Grant 4,438,462 - Koester , et al. March 20, 1 | 1984-03-20 |
Document authentication by means of exchange-anisotropic magnetic material
Grant 4,396,886 - Koester , et al. August 2, 1 | 1983-08-02 |
Device for magnetically orienting the magnetizable particles or magnetic recording media in a preferred direction
Grant 4,382,244 - Koester , et al. May 3, 1 | 1983-05-03 |
Process of making a magnetic recording medium
Grant 4,287,225 - Kneller , et al. September 1, 1 | 1981-09-01 |
Apparatus for spin coating in the production of thin magnetic layers for magnetic discs
Grant 4,201,149 - Koester , et al. May 6, 1 | 1980-05-06 |
Process for the manufacture of magnetic recording media
Grant 4,201,486 - Huebner , et al. May 6, 1 | 1980-05-06 |
Manufacture of acicular ferromagnetic iron particles
Grant 4,178,171 - Steck , et al. December 11, 1 | 1979-12-11 |
Stabilization of chromium dioxide magnetic pigments
Grant 4,177,317 - Schoenafinger , et al. December 4, 1 | 1979-12-04 |
Manufacture of ferromagnetic metal particles essentially consisting of iron
Grant 4,165,232 - Jaeckh , et al. August 21, 1 | 1979-08-21 |
Manufacture of magnetic discs
Grant 4,133,911 - Koester , et al. January 9, 1 | 1979-01-09 |
Manufacture of cobalt-modified .gamma.-iron(III)oxides
Grant 4,064,292 - Schoenafinger , et al. December 20, 1 | 1977-12-20 |
Manufacture of ferromagnetic, acicular metallic iron particles by hydrogen reduction
Grant 4,050,962 - Koester , et al. September 27, 1 | 1977-09-27 |
Manufacture of acicular ferromagnetic metal pigments containing iron
Grant 4,017,303 - Koester , et al. April 12, 1 | 1977-04-12 |
Device for the magnetic orientation of magnetic recording media
Grant 4,003,336 - Koester , et al. January 18, 1 | 1977-01-18 |
Device for the non-destructive measurement of the remanent flux density of magnetic recording media, especially magnetic discs
Grant 3,984,763 - Koester , et al. October 5, 1 | 1976-10-05 |
Manufacture of magnetic materials which exhibit exchange anisotropy
Grant 3,961,990 - Koester , et al. June 8, 1 | 1976-06-08 |
Magnetic materials with exchange anisotropy and process for their manufacture
Grant 3,959,032 - Koester , et al. May 25, 1 | 1976-05-25 |
Method of making magnetic recordings which cannot be altered without it being noticed
Grant 3,883,892 - Kneller , et al. May 13, 1 | 1975-05-13 |
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