Simplex Time Recorder Co.
53Patents
0Active
53Granted
37Portfolio score
Filing activity: Jul 23, 1974 → Feb 24, 2000
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6038289A | Redundant video alarm monitoring system | Electricity | 240 | Expired |
| US5862201A | Redundant alarm monitoring system | Electricity | 107 | Expired |
| US4796025A | Monitor/control communication net with intelligent peripherals | Electricity | 70 | Expired |
| US6033245A | Self-aligning electrical connector | Emerging Cross-Sectional Technologies | 60 | Expired |
| US6313744A | Alarm system with individual alarm indicator testing | Physics | 49 | Expired |
| US5552763A | Fire alarm system with sensitivity adjustment | Physics | 48 | Expired |
| US5559492A | Synchronized strobe alarm system | Physics | 47 | Expired |
| USD299316S | Clock | General | 30 | Expired |
| US5173683A | Apparatus and method for multiplexing multiple data and analog values in a peripheral device | Physics | 29 | Expired |
| US5710541A | Smoke/fire detector | Physics | 24 | Expired |
| US5818326A | Early fire detection using temperature and smoke sensing | Physics | 24 | Expired |
| US5751218A | Smoke detector housing for improved smoke collection | Physics | 24 | Expired |
| US6567001B1 | Fire control panel monitoring for degradation of wiring integrity during alarm state | Physics | 23 | Expired |
| USD388351S | Smoke detector | General | 22 | Expired |
| US4542286A | Time card and carrier | Physics | 21 | Expired |
| US5508977A | Service technician time recorder | Physics | 21 | Expired |
| USD377460S | Heat detector | General | 20 | Expired |
| US5622427A | Emergency strobe light | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US5808556A | Smoke/fire detector | Physics | 19 | Expired |
| US5886620A | Building alarm system with synchronized strobes | Physics | 19 | Expired |
| US5450066A | Fire alarm heat detector | Physics | 18 | Expired |
| USD265802S | Annunciator | General | 18 | Expired |
| US6281789A | Alarm system having improved control of notification appliances over common power lines | Physics | 17 | Expired |
| US6061303A | Programmable time recorder | Physics | 17 | Expired |
| US5966002A | Method and apparatus for adapting voltage control in alarm systems | Emerging Cross-Sectional Technologies | 15 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.