Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871181 | Reinforced squeak free seal for exhaust couplings | Peter P. Usher, John Slonksnes | 1989-10-03 |
| 4601476 | Squeak free seal for exhaust couplings | Peter P. Usher | 1986-07-22 |
| 4549741 | Combination metal and knitted wire mesh gasket | Peter P. Usher | 1985-10-29 |
| 4463959 | Composite gasket including rings of refractory sheet material and knitted wire mesh | Peter P. Usher | 1984-08-07 |
| 4462603 | Knitted wire mesh exhaust coupling seal with refractory metallic oxide impregnant | Peter P. Usher | 1984-07-31 |