Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4909410 | Protective cover for bulk container | Norwin C. Derby | 1990-03-20 |
| 4903859 | Container for flowable materials | Norwin C. Derby | 1990-02-27 |
| 4865218 | Protective cover for bulk container | Norwin C. Derby | 1989-09-12 |
| 4294079 | Insulated container and process for shipping perishables | — | 1981-10-13 |