Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33742 | Locking differential with electromagnetic actuated clutch | Martin Blessing, Richard L. Pifer | 1991-11-12 |
| 4795403 | Torsional sleeve coupling | Mark Charles Barnholt, Donald E. Hobson, Richard L. Pifer | 1989-01-03 |
| 4781078 | Locking differential with electromagnetic actuated clutch | Martin Blessing, Richard L. Pifer | 1988-11-01 |
| 4774857 | Two speed axle assembly | Richard L. Pifer, James A. Krisher | 1988-10-04 |
| 4628753 | Lightweight ring gear for a differential | Richard L. Pifer | 1986-12-16 |