Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7552801 | Elevator systems having display systems with pluralities of sequentially connected monitor units | — | 2009-06-30 |
| 6971480 | Elevator communication devices, systems and methods | — | 2005-12-06 |
| 5982862 | Dial inbound meter interface unit which derives power from telephone line when telephone is ringing | Benjamin Bradley | 1999-11-09 |
| 5815558 | Dial inbound meter interface unit which uses two elements for coupling to and isolating from meter | Benjamin Bradley | 1998-09-29 |