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:
Mar. 17, 1987
Filed:
May. 29, 1985
Applicant:
Inventor:
Peter C Parsonage, Auckland, NZ;
Assignee:
Development Finance Corporation, Auckland, NZ;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
307117 ; 307116 ; 307311 ; 250551 ; 250209 ; 250210 ;
Abstract
An electronic switch has a pair of light dependent resistors forming part of a potential divider with the hysteresis of the circuit being high enough to prevent equally applied changes in light level from effecting the switch action. The divider controls the voltage to an operational amplifier which is switched off by covering the other resistor. The switch may be combined with an opto-isolator or a relay to control power circuits.