Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5734374 | Trackball contamination barriers | — | 1998-03-31 | |
| 5020008 | Method of calibrating vehicle speed signals | Duncan E. Estep, Walter E. Frankiewicz, Ronald W. Friend, James M. Lawson | 1991-05-28 | $5,208,000 |
| 4953783 | Mailbox signal device | — | 1990-09-04 |