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:
Aug. 19, 1980
Filed:
Sep. 01, 1978
Applicant:
Inventor:
Kenneth C Kiesel, Wayland, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307311 ; 307308 ; 307318 ; 250552 ; 323 21 ;
Abstract
A sensor for producing an electrical signal parameter responsive to the mean square of an applied alternating voltage has a rectifier element, and has a zener diode element electrically in series with a light-emitting diode element across the direct voltage which the rectifier element produces. The polarity of the direct voltage applies reverse voltage to the zener diode element and applies forward voltage to the light-emitting diode element. A photoconductor is optically coupled to receive electroluminescense which the light-emitting diode element emits.