Sheldon P. Apsell

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Nahant, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Multiple sensor intrusion detection system
- Patent number 4,321,592
- Issue date Mar 23, 1982
- American District Telegraph Company
- Richard E. Crandall
- G08 - SIGNALLING
Information Patent Grant
Methods of and apparatus for time clock recording and computation a...
- Patent number 4,270,043
- Issue date May 26, 1981
- Kronos Inc.
- Larry K. Baxter
- G07 - CHECKING-DEVICES
Information Patent Grant
Multiple sensor intrusion alarm system
- Patent number 4,206,449
- Issue date Jun 3, 1980
- American District Telegraph Company
- Aaron A. Galvin
- G08 - SIGNALLING