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:
Nov. 08, 1977
Filed:
Aug. 26, 1975
Applicant:
Inventors:
Shigeo Akasaka, Kodaira, JA;
Hiroaki Tanaka, Tokyo, JA;
Assignee:
Nippon Kogaku K.K., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
352141 ; 352121 ;
Abstract
An exposure time control device in a cinecamera comprises a rotatable shutter, an electric motor for driving the shutter, a power source for the motor, and changing means operatively associated with the rotatable shutter to change the number of revolutions of the motor within a period during which an aperture is opened and closed by the rotatable shutter.
Akasaka, Shigeo. (1977). Exposure time control device in a cinecamera (U.S. Patent No. 4057333). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4057333
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile