Patents per Year
Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5170008 | External cable grommet for cable entry of EMI protected cabinets | Richard E. Trogisch, Robert E. Wagner | 1992-12-08 | $8,349,000 |
| 4924495 | Enhanced communication services and apparatus | Philip Richards | 1990-05-08 | |
| 4696344 | Annulus pressure operated ratchet device | Theron A. Scott | 1987-09-29 | $8,882,000 |
| 4646829 | Hydraulically set and released bridge plug | Burchus Q. Barrington, Bernard L. Hackney | 1987-03-03 | $6,616,000 |
| 4590995 | Retrievable straddle packer | — | 1986-05-27 | $15,122,000 |
| 4405201 | Fiber optic connector | Frank P. Cefarelli | 1983-09-20 | $38,099,000 |
| 4312564 | Multi-fiber optic connector | Frank P. Cefarelli | 1982-01-26 | $10,360,000 |
| 4278130 | Access valve for drill stem testing | Richard L. Giroux | 1981-07-14 | $45,646,000 |