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. 15, 1980
Filed:
Sep. 12, 1978
Applicant:
Inventor:
Zenichi Ohkura, Omiya, JP;
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
355 61 ; 354198 ; 355 63 ;
Abstract
An enlargement lens system has a light guide element positioned in the gap between the outer periphery of a rear lens group frame and a lens mount. A dispersion lens is provided on a portion of the rear lens and a transmission window is disposed on the rear lens frame. Light inside the effective area of the lens passes through the dispersion surface and the transmission window onto the light guide. The reflex surface on the guide reflects light onto the lens stop-value scale.
Ohkura, Zenichi. (1980). Enlarger lens system having stop-value scale illuminating mechanism (U.S. Patent No. 4183661). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4183661
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile