Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9989164 | Air-operated, magnetic, non-stall air directional control valve | Cody L. Gehrke, Ronald Eugene Childers | 2018-06-05 |
| 5747135 | Thin film pretreatment for memory disks and associated methods | Dhruba J. Chakrabarti, Richard A. Hoffman | 1998-05-05 |
| 5601934 | Memory disk sheet stock and method | Charles W. Bartges, Stephen E. Baumann, Robert W. Hyland, Jr., Gary P. Tarcy, K. Dean Vinnedge +1 more | 1997-02-11 |
| 5055257 | Superplastic aluminum products and alloys | Dhruba J. Chakrabarti, James T. Staley, Stephen F. Baumann, Ralph R. Sawtell, Philip E. Bretz | 1991-10-08 |
| 4874440 | Superplastic aluminum products and alloys | Ralph R. Sawtell, Philip E. Bretz | 1989-10-17 |
| 4689090 | Superplastic aluminum alloys containing scandium | Ralph R. Sawtell, Philip E. Bretz | 1987-08-25 |