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Roy L. Harvey
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Lexington, MA, US
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last 30 patents
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Patent Grant
Multimode programmable stand-alone access control system
Patent number
4,634,846
Issue date
Jan 6, 1987
American District Telegraph Company
Roy L. Harvey
G07 - CHECKING-DEVICES
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
Information
Patent Grant
Integrated security system having a multiprogrammed controller
Patent number
4,538,138
Issue date
Aug 27, 1985
American District Telegraph Company
Roy L. Harvey
G08 - SIGNALLING
Information
Patent Grant
Two-wire multi-zone alarm system
Patent number
4,491,828
Issue date
Jan 1, 1985
American District Telegraph Company
Aaron A. Galvin
G08 - SIGNALLING
Information
Patent Grant
Non-home run zoning system
Patent number
4,468,664
Issue date
Aug 28, 1984
American District Telegraph Company
Aaron A. Galvin
G08 - SIGNALLING
Information
Patent Grant
Two-wire multi-zone alarm system
Patent number
4,423,410
Issue date
Dec 27, 1983
American District Telegraph Company
Aaron A. Galvin
G08 - SIGNALLING
Information
Patent Grant
Two-wire multi-zone alarm system
Patent number
4,359,721
Issue date
Nov 16, 1982
American District Telegraph Company
Aaron A. Galvin
G08 - SIGNALLING