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:
Dec. 20, 1977
Filed:
Mar. 10, 1976
Applicant:
Inventors:
Thomas D McLaughlin, Thousand Oaks, CA (US);
Richard M Altman, Woodland Hills, CA (US);
Assignee:
Optigon Research & Development Corporation, Santa Monica, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 31 ; 354219 ; 354224 ;
Abstract
A light detecting system for a single lens reflex camera in which an image of the focusing screen is reflected to the normally unused surface of the pentaprism from a partially reflective surface in the viewfinder system. The reflective surface in one form may be glass-to-air interfaces on the viewfinder axis in the eyepiece, but also may be a thin partially reflecting coating.