Assignee
BEYERSDORF HARTWIG
DE·7 granted patents·131 citations·filing 1975–1991
Top patents by PatentIndex Score
7 records- 0185US4207487AElectric machineBEYERSDORF HARTWIG·Filed 1976·Granted Jun 10, 1980·42 cites·8 claims
- 0279US4139770ASmoke alarmBEYERSDORF HARTWIG·Filed 1977·Granted Feb 13, 1979·32 cites·16 claims
- 0365US5008559AMethod for operating an optical smoke detector and optical smoke detector for the methodBEYERSDORF HARTWIG·Filed 1989·Granted Apr 16, 1991·31 cites·14 claims
- 0453US4037220ACircuit arrangement for monitoring interruptions in two closed-circuit loopsBEYERSDORF HARTWIG·Filed 1975·Granted Jul 19, 1977·12 cites·38 claims
- 0537US4213046AIonization fire-signal deviceBEYERSDORF HARTWIG·Filed 1978·Granted Jul 15, 1980·5 cites·11 claims
- 0633US5189399AMethod of operating an ionization smoke alarm and ionization smoke alarmBEYERSDORF HARTWIG·Filed 1991·Granted Feb 23, 1993·6 cites·30 claims
- 0732US4243981AIonization fire-signal deviceBEYERSDORF HARTWIG·Filed 1978·Granted Jan 6, 1981·3 cites·34 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →