Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5080743 | Process for preparation of a wholly carbonaceous diaphragm for acoustic equipment use | — | 1992-01-14 |
| 5072806 | Diaphragm for acoustic equipment | — | 1991-12-17 |
| 4938829 | Process of making a diaphragm of vitreous hard carbonaceous material for an acoustic device | — | 1990-07-03 |
| 4921559 | Process of making an acoustic carbon diaphragm | — | 1990-05-01 |