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Electro-optical system for detecting the presence of an object within a predetermined detection system
US 5,245,177 A
Filed
: 10/24/1991
Issued
: 09/14/1993
Est. Priority Date
: 10/24/1991
Status: Expired due to Fees
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Current Assignee
Norman H. Schiller
Original Assignee
Norman H. Schiller
Inventors
Schiller, Norman H.
Primary Examiner(s)
Nelms, David C.
Assistant Examiner(s)
Lee, John R.
Application Number
US07/782,292
Time in Patent Office
691 Days
Field of Search
250/221, 250/222.1, 250/208.2, 250/561, 356/1, 356/4, 340/555, 340/556, 340/557
US Class Current
250/221
CPC Class Codes
G01V 8/20
using multiple transmitters...
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