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:
Apr. 20, 1982
Filed:
May. 14, 1981
Applicant:
Inventors:
Hiroshi Iwata, Nara, JP;
Tetsuo Yamaoka, Osaka, JP;
Assignee:
West Electric Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ;
U.S. Cl.
CPC ...
354145 ; 354286 ; 362 18 ;
Abstract
In an electronic flash device used as an artificial light source in photography, a liquid crystal plate or window is disposed in front of a flash unit comprising a flash lamp and a reflector and a voltage is applied or not applied to the liquid crystal plate or window depending upon the type; that is, the focal length or angle of view of a photographic lens attached to a camera body, whereby the angle of flash illumination can be varied suitably depending upon the lens type.
Iwata, Hiroshi. (1982). Electronic flash device (U.S. Patent No. 4325621). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4325621
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile