Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4721739 | Erasable ink compositions | Richard S. Brenneman, Paul M. Drennan, Alice H. Pincus, Chaudhary M. Ramzan | 1988-01-26 |
| 4454611 | Heat resistant protective hand covering | Richard P. Tschirch, Kenneth R. Sidman | 1984-06-19 |
| 4433439 | Heat resistant protective hand covering | Kenneth R. Sidman | 1984-02-28 |
| 4294792 | Molded plastic parts, particularly spin-cast plastic parts for eyeglass frames | Richard E. Merrill, Arthur Paul Drennan, III | 1981-10-13 |