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Kenneth J. Leff
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Halifax, MA, US
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last 30 patents
Information
Patent Grant
Electrical interference free projected beam smoke detector
Patent number
4,823,015
Issue date
Apr 18, 1989
ADT, Inc.
Aaron A. Galvin
G08 - SIGNALLING
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Patent Grant
Self-diagnostic projected-beam smoke detector
Patent number
4,749,871
Issue date
Jun 7, 1988
ADT, Inc.
Aaron A. Galvin
G08 - SIGNALLING
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Patent Grant
Modular transceiver with adjustable specular member
Patent number
4,687,924
Issue date
Aug 18, 1987
ADT Inc.
Aaron A. Galvin
G08 - SIGNALLING
Information
Patent Grant
Electrical interconnection apparatus and technique
Patent number
4,679,881
Issue date
Jul 14, 1987
American District Telegraph Company
Aaron A. Galvin
H01 - BASIC ELECTRIC ELEMENTS
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Patent Grant
Optically-based access control system
Patent number
4,544,836
Issue date
Oct 1, 1985
American District Telegraph Company
Aaron A. Galvin
G06 - COMPUTING CALCULATING COUNTING