Issued Patents All Time
Showing 26–50 of 62 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5538292 | Rotary union | — | 1996-07-23 |
| 5487458 | Electrically energized oil shear drive system | — | 1996-01-30 |
| 5487456 | Press drive with oil shear clutch/brake drives with internal flywheel brake | — | 1996-01-30 |
| 5454765 | Electrically energized oil shear drive system | — | 1995-10-03 |
| 5360091 | Electrically actuated clutch brake apparatus | — | 1994-11-01 |
| 5323888 | Electrical actuated multi-speed drive apparatus | — | 1994-06-28 |
| 5291977 | Electrically actuated clutch brake apparatus | — | 1994-03-08 |
| 5285879 | Electrical actuated multi-speed drive apparatus | — | 1994-02-15 |
| 5195623 | Two speed drive with oil shear electro clutch/brake | — | 1993-03-23 |
| 5194057 | Two speed press drive | — | 1993-03-16 |
| 5190129 | Press drive with oil shear clutch/brake drives | — | 1993-03-02 |
| 5186288 | Electro-shear brake | — | 1993-02-16 |
| 4921078 | Electro-shear brake | — | 1990-05-01 |
| 4865172 | Combination brake and inching device | — | 1989-09-12 |
| 4781543 | Artificial lift system for oil wells | — | 1988-11-01 |
| 4765448 | Inching drive | — | 1988-08-23 |
| 4693350 | Clutch-brake unit | — | 1987-09-15 |
| 4616739 | Inching drive | — | 1986-10-14 |
| 4601640 | Oil well pump | — | 1986-07-22 |
| 4600368 | Pressure actuated downhole pump | — | 1986-07-15 |
| 4598804 | Motor drive system | — | 1986-07-08 |
| 4552255 | Multiple speed drive | — | 1985-11-12 |
| 4527681 | Variable speed drive unit with graduated increasing and decreasing speed profile | — | 1985-07-09 |
| 4506772 | Modular accesories for clutch/brake unit | — | 1985-03-26 |
| 4496032 | Brake unit | — | 1985-01-29 |