Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4622840 | Method for drawing telescoping tubes for torque transmission | Harold R. Diffenderfer | 1986-11-18 |
| 4622022 | Telescoping tubes for torque transmission | Harold R. Diffenderfer | 1986-11-11 |
| 4568313 | Protective guard for articulated shafting | Harold R. Diffenderfer | 1986-02-04 |