Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4728214 | Ink duct for tubular styluses | — | 1988-03-01 |
| 4645367 | Writing implement venting system | Albert Menrath | 1987-02-24 |
| 4493575 | Releasable protective holder for a writing implement | — | 1985-01-15 |
| 4461591 | Ink writing implement | — | 1984-07-24 |
| 4390299 | India ink drawing implement | — | 1983-06-28 |
| 4355726 | Stand for holding and sealingly retaining India ink drawing implements | — | 1982-10-26 |
| 4334622 | Stand for holding and sealingly retaining India ink drawing implements | — | 1982-06-15 |
| 4239408 | Fountain pen with improved ink flow control | — | 1980-12-16 |