Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7257382 | High frequency amplifier circuit permitting variable gain control | Tomoyuki Arai | 2007-08-14 |
| 5012864 | Wellhead apparatus involving a free fall plunger in a well | — | 1991-05-07 |
| 4898235 | Wellhead apparatus for use with a plunger produced gas well having a shut-in timer, and method of use thereof | — | 1990-02-06 |