Apparatus for photoelectric detection
United States Patent 2631273

Inventors:
Bagno, Samuel M.
Publication Date:
03/10/1953
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Assignee:
ALERTRONIC PROTECTIVE CORP OF
Primary Class:
340/555
Other Classes:
315/241R, 324/133, 250/214R, 340/556, 307/650, 315/245
International Classes:
G08B13/183; G08B13/18
US Patent References:
2080504Electrical apparatus
2202060Alarm system
2207540Method of and means for frequency comparison and measurement
2227147Photoelectric burglar alarm system
2302271Alarm system
2457502Signal system employing polarized light