Issued Patents All Time
Showing 26–41 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8314390 | PIR motion sensor system | — | 2012-11-20 |
| 7755052 | PIR motion sensor | — | 2010-07-13 |
| 7622845 | Piezoelectric transducer signal processing circuit | — | 2009-11-24 |
| 7579595 | PIR motion sensor | — | 2009-08-25 |
| 7498576 | Temperature detecting system and method | — | 2009-03-03 |
| 7399969 | PIR motion sensor | — | 2008-07-15 |
| 7399970 | PIR motion sensor | — | 2008-07-15 |
| 7352107 | Transconductance circuit for piezoelectric transducer | — | 2008-04-01 |
| 7183912 | PIR motion sensor utilizing sum and difference sensor signals | — | 2007-02-27 |
| 7141910 | Transconductance circuit for piezoelectric transducer | — | 2006-11-28 |
| 7042134 | Transconductance circuit for piezoelectric transducer | — | 2006-05-09 |
| 6340816 | Pyroelectric detector with feedback amplifier for enhanced low frequency response | — | 2002-01-22 |
| 5589779 | Potentiometer circuit providing identifiable open wiper signals | — | 1996-12-31 |
| 4476706 | Remote calibration system | David M. Hadden | 1984-10-16 |
| 4305724 | Combustible gas detection system | — | 1981-12-15 |
| 4260950 | Automatic portable pH meter and method with calibration receptacle | David M. Hadden | 1981-04-07 |