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:
Jun. 17, 1980
Filed:
Sep. 12, 1978
Zenichi Ohkura, Omiya, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An enlargement system has a light guide mounted inside the lens mount to reflect light from inside the enlarger on to a stop-value scale. A light shut-off ring is positioned relative to the light guide to selectively allow or cut-off the passage of light. In a first position a cut away portion allows light from inside the enlarger to pass through the light guide and illuminate the scale. When the system is used for close-up photography, the shut-off ring is rotated to prevent light that enters through the scale into the light guide from propagating into the enlarger.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile