Sentrol, Inc.
46Patents
0Active
46Granted
36Portfolio score
Filing activity: Oct 23, 1978 → Mar 31, 1997
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5546074A | Smoke detector system with self-diagnostic capabilities and replaceable smoke intake canopy | Physics | 221 | Expired |
| US4661804A | Supervised wireless security system | Physics | 83 | Expired |
| USD280494S | Housing for a personal transmitter for use in an emergency alarm system | General | 75 | Expired |
| US5428345A | Method of and apparatus for operating a security system to produce an alarm signal | Physics | 55 | Expired |
| US4523184A | Supervised wireless security system | Physics | 53 | Expired |
| US5233323A | Defeat resistant interlock/monitoring system | Electricity | 45 | Expired |
| US4745398A | Self-powered sensor for use in closed-loop security system | Physics | 39 | Expired |
| US5708414A | Sensitivity fault indication technique implemented in smoke detector system with self-diagnostic capabilities | Physics | 39 | Expired |
| US5534849A | Time multiplexed, false alarm resistant magnetically actuated security system | Electricity | 38 | Expired |
| US5192931A | Dual channel glass break detector | Physics | 31 | Expired |
| US4536754A | Magnetically retained connecting cable incorporating magnetically operated switch | Performing Operations; Transporting | 31 | Expired |
| US5565852A | Smoke detector with digital display | Physics | 29 | Expired |
| US5026990A | Method and apparatus for installing infrared sensors in intrusion detection systems | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4336518A | Plunger operated magnetic contact switch assembly | Electricity | 25 | Expired |
| US4943791A | Wide gap magnetic reed switch and method for manufacture of same | Electricity | 24 | Expired |
| US5311024A | Lens arrangement for intrusion detection device | Emerging Cross-Sectional Technologies | 24 | Expired |
| US4837558A | Glass break detector | Physics | 23 | Expired |
| USD281865S | Surface mount housing for a security system transmitter | General | 19 | Expired |
| USD359701S | Smoke detector cover | General | 18 | Expired |
| US5510767A | Glass break detector having reduced susceptibility to false alarms | Physics | 17 | Expired |
| USD255030S | Housing for a magnetic contact switch | General | 16 | Expired |
| USD361732S | Smoke detector housing | General | 15 | Expired |
| US4409577A | Switch housing having recessed conductor terminals | Electricity | 14 | Expired |
| US5777552A | Curtain door alarm | Physics | 14 | Expired |
| US4456897A | Plunger-operated switch unit | Electricity | 14 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.