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:
Jul. 25, 1978
Filed:
Jun. 16, 1976
Applicant:
Inventor:
James R Haas, Norwalk, OH (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340603 ; 200 6121 ; 250229 ; 307118 ; 340606 ; 340617 ; 340619 ;
Abstract
A material sensing device comprising a flexible or collapsible tube with a light sensitive device therein which receives light through the tube from a spaced apart light emitting device. The signal from the light sensitive device is amplified and used to operate a silicon controlled rectifier that snap actuates a solenoid operated switch. The invention includes an amplifying circuit in which the amplifier is the load for the silicon controlled rectifier and a generally fixed bias is provided to the gate of the SCR with the result that the circuit automatically resets the SCR during normal operation.