Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4955504 | Injection-moulded plastic lid for a container and a container having such an injection-moulded plastic lid | — | 1990-09-11 |
| D298379 | Drum | Edward H. Hamilton, Ralph M. Onstenk | 1988-11-01 |
| 4674650 | Container and cover fastening means | Edward H. Hamilton, Ralph M. Onstenk | 1987-06-23 |