Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4651827 | Hydraulically controlled safety valves for incorporation in production tubes of hydrocarbon production wells | Paul M. Helderle | 1987-03-24 |
| 4588422 | Process and equipment for sampling a gaseous effluent and their application to chromatography | — | 1986-05-13 |