The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 1979
Filed:
Sep. 07, 1976
Applicant:
Inventor:
Terrence F Eberle, Scottsdale, AZ (US);
Assignee:
Solid State Devices, Inc., Phoenix, AZ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60Q / ;
U.S. Cl.
CPC ...
340 46 ; 340 / ; 340642 ;
Abstract
An error detecting circuit which senses the operating states of a plurality of traffic signal lights the energization of which is controlled by a single block of load switches and which circuit produces an error signal when certain predetermined relations exist for a predetermined period of time between the states of the lights, such as, if more than one traffic signal light of one traffic signal head is energized simultaneously or if none of the traffic signal lights of one traffic signal head is energized.