Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5294132 | Semi-cartridge seal | Henry S. Duffee | 1994-03-15 |
| 5035436 | Housing seal chamber body | Robert E. Rockwood, Henry S. Duffee | 1991-07-30 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5294132 | Semi-cartridge seal | Henry S. Duffee | 1994-03-15 |
| 5035436 | Housing seal chamber body | Robert E. Rockwood, Henry S. Duffee | 1991-07-30 |