Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4630833 | Molded ring seal with end support rings | William G. Boyle | 1986-12-23 |
| 4489743 | Differential gas lift valve | Carlos R. Canalizo | 1984-12-25 |
| 4483543 | Seals | William G. Boyle | 1984-11-20 |
| 4436152 | Shifting tool | William R. Welch | 1984-03-13 |
| 4432416 | Well flow control apparatus | William R. Welch, John H. Yonker | 1984-02-21 |
| 4428557 | Single line deep depth safety valve | John H. Yonker | 1984-01-31 |
| 4381822 | Landing nipple | — | 1983-05-03 |
| 4378839 | Well tool | — | 1983-04-05 |
| 4362211 | Locking mandrel | — | 1982-12-07 |
| 4352366 | Velocity operated standing valve | — | 1982-10-05 |
| 4294315 | Landing nipple | John H. Yonker, David Bills | 1981-10-13 |
| 4193450 | Surface controlled subsurface safety valve | — | 1980-03-18 |