Alarm for signaling unauthorized door exit and entry

Details Alarm for signaling unauthorized door exit and entry Alarm for signaling unauthorized door exit and entry

1989-11-13

1993-10-12

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D10104

Patent

active

D03401995

REFERENCES:
patent: 3233054 (1966-02-01), Shoffstall
patent: 3340522 (1967-09-01), Chick et al.
patent: 3435643 (1969-04-01), Pollak et al.
patent: 3525830 (1970-08-01), Hawkins
patent: 3530262 (1970-09-01), Hawkins
patent: 3810091 (1974-05-01), Hoover
patent: 4038552 (1977-07-01), Ciofalo
patent: 4584856 (1986-04-01), Petersdorff et al.
patent: 5072212 (1991-12-01), Sorenson
Lectric Lites Co. p. 1 Nov. 19, 1979 upper left corner (stop sign).

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