Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6748061 | Access control system having a programmable automatic notification feature | Wayne B. Dow | 2004-06-08 |
| 6728351 | Access control system having tenant codes that may be selectively displayed | Harvey Stone | 2004-04-27 |
| 6606260 | Switch mode power supply for a telephone entry system or the like | — | 2003-08-12 |
| 6218956 | Gate operator with remote diagnostic capability | William R. Davis, John M. Hansen, Ronald A. Wray, Richard P. Greenthal | 2001-04-17 |
| 5416495 | Liquid-crystal display unit for electronic directory | William R. Davis, Richard P. Greenthal | 1995-05-16 |