Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4561472 | Sliding blade closure apparatus with inflatable sealing ring | William R. McLennan | 1985-12-31 |
| 4491144 | Flexible seals for sliding blade dampers | Russell F. Rarick | 1985-01-01 |
| 4474205 | Sliding blade apparatus for closing conduits | William R. McLennan, Kenneth I. Conley | 1984-10-02 |