Kenneth J. Leff

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Halifax, MA, US

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Patents Grantslast 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
Information 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
Information 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
Information 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