Cerberus AG
133Patents
0Active
133Granted
41Portfolio score
Filing activity: Jun 21, 1974 → Sep 30, 1998
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5451931A | Optical smoke detector | Physics | 79 | Expired |
| US4746910A | Passive infrared intrusion detector employing correlation analysis | Emerging Cross-Sectional Technologies | 68 | Expired |
| US4390869A | Gas sensing signaling system | Physics | 58 | Expired |
| US6006585A | Optoacoustic gas sensor | Physics | 56 | Expired |
| US4179691A | Infrared intrusion detector circuit | Emerging Cross-Sectional Technologies | 53 | Expired |
| US5381130A | Optical smoke detector with active self-monitoring | Physics | 43 | Expired |
| US5753797A | Photo-acoustic gas sensor and its manufacture and use | Physics | 38 | Expired |
| US4991123A | Alarm system | Physics | 37 | Expired |
| US4906978A | Optical smoke detector | Physics | 37 | Expired |
| US4429224A | Optical arrangement for an infrared intrusion detector | Emerging Cross-Sectional Technologies | 37 | Expired |
| US4447726A | Passive infrared intrusion detector | Emerging Cross-Sectional Technologies | 37 | Expired |
| US4418335A | Infrared intrusion detector with pyroelectric sensor and charge amplifier | Emerging Cross-Sectional Technologies | 35 | Expired |
| US3940753A | Detection of presence or absence of flames | Physics | 34 | Expired |
| US4627269A | Method of, and apparatus for, detecting reducing gases in a gas mixture | Physics | 34 | Expired |
| US4087688A | Infrared radiation-burglary detector | Emerging Cross-Sectional Technologies | 32 | Expired |
| US5045702A | Infrared intrustion detector | Emerging Cross-Sectional Technologies | 31 | Expired |
| US4975684A | Fire detecting system | Physics | 31 | Expired |
| US4757204A | Ceiling mounted passive infrared intrusion detector with dome shaped lens | Emerging Cross-Sectional Technologies | 30 | Expired |
| US3994603A | Detection system to determine the transmissivity of a medium with respect to radiation, particularly the light transmissivity of smoke-contaminated air, for fire detection | Physics | 30 | Expired |
| US4081680A | Infrared radiation-burglary detector | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4668635A | Method of detecting reative gases in a gas mixture | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4315594A | Connection apparatus for a fire alarm | Physics | 28 | Expired |
| US4181439A | Smoke detector with a conical ring-shaped radiation region | Physics | 28 | Expired |
| US5497144A | Testing and adjustment of scattered-light smoke detectors | Physics | 26 | Expired |
| US4356478A | Employing a shape memory alloy in a fire alarm temperature sensitive element | Physics | 24 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.