Title:
Apparatus for photoelectric detection
United States Patent 2631273
Inventors:
Bagno, Samuel M.
Publication Date:
03/10/1953
Export Citation:
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Assignee:
ALERTRONIC PROTECTIVE CORP OF
Primary Class:
340/555
Other Classes:
250/214R, 307/650, 315/241R, 315/245, 324/133, 340/556
International Classes:
G08B13/183; G08B13/18
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US Patent References:
2457502Signal system employing polarized light
2302271Alarm system
2227147Photoelectric burglar alarm system
2207540Method of and means for frequency comparison and measurement
2202060Alarm system
2080504Electrical apparatus
2062274Power supply system
2044146Control system
1971191Light responsive circuit controller
1799993Neon-lamp stroboscope
1762725Method of and means for indicating synchronism