Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4916959 | Long stroke well pumping unit with carriage | — | 1990-04-17 |
| 4719811 | Well pumping unit with counterweight | Jerry M. Lang | 1988-01-19 |
| 4638676 | Reciprocating drive mechanism with positive pinion-to-rack gear engagement | Jerry M. Lang | 1987-01-27 |