Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4738373 | Cup cover having opening means | — | 1988-04-19 |
| 4202459 | Disposable cup cover | Edward P. Billitzer | 1980-05-13 |
| 4183443 | Reusable cup cover | Edward P. Billitzer | 1980-01-15 |