Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6218956 | Gate operator with remote diagnostic capability | William R. Davis, John M. Hansen, John F. Ahlstrom, Richard P. Greenthal | 2001-04-17 |
| 5475741 | Telephone-entry system with electronic directory | William R. Davis, Dennis W. Mowers, Richard P. Greenthal, Paul Szymanski, Richard A. Davidson | 1995-12-12 |
| 5252955 | Liquid-crystal display unit for electronic directory | William R. Davis, Dennis W. Mowers, Richard P. Greenthal, Paul Szymanski, Richard A. Davidson | 1993-10-12 |
| 5027111 | Liquid-crystal display unit for electronic directory | William R. Davis, Dennis W. Mowers, Richard P. Greenthal, Paul Szymanski, Richard A. Davidson | 1991-06-25 |