Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4711299 | Apparatus and methods for pumping solids and undesirable liquids from a well bore | Robert J. Spring | 1987-12-08 |
| 4621693 | Apparatus and methods for pumping solids and undesirable liquids from a well bore | Robert J. Spring | 1986-11-11 |
| 4478285 | Method and apparatus for removal of downhole well debris | — | 1984-10-23 |
| 4223073 | High-temperature damping composite | Thomas F. Gardeski | 1980-09-16 |