Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852394 | Anti-extrusion sealing means | — | 1989-08-01 |
| 4838303 | Buoyancy operable liquid level sensor for controlling an alarm pressure fluid supply responsive to changes of liquid level in a pressure vessel | — | 1989-06-13 |
| 4831957 | First trip indicator for sensing devices of production control and safety systems | — | 1989-05-23 |