Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4254537 | Line tightener | Richard J. Zenda | 1981-03-10 |
| 4224854 | Sheet cutting and scoring device and method | Richard J. Zenda | 1980-09-30 |
| 4222171 | Drafting instrument | — | 1980-09-16 |
| 4196603 | Combination push-button lock | Richard J. Zenda | 1980-04-08 |
| 4193165 | Hinge construction | Richard J. Zenda | 1980-03-18 |