Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5859755 | Magnetic tape recording head cleaning apparatus | Edward E. Griffin, Jeffrey S. Thiessen, Edwin W. Hazzard, Stephen A. Nunn | 1999-01-12 |
| 5748418 | Magnetic tape recording head cleaning apparatus | Edward E. Griffin, Jeffrey S. Thiessen, Edwin W. Hazzard, Stephen A. Nunn | 1998-05-05 |
| 5703742 | Universal cassette cartridge | Jeffrey S. Thiessen, John M. Enga | 1997-12-30 |
| 5541794 | Magnetic tape recording head cleaning apparatus | Edward E. Griffen, Jeffrey S. Thiessen, Edwin W. Hazzard, Stephen A. Nunn | 1996-07-30 |