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:
Sep. 13, 1994
Filed:
Mar. 15, 1993
Shuichi Kikuchi, Miyagi, JP;
Toshiro Kobayashi, Kanagawa, JP;
Sony Corporation, Shinagawa, JP;
Abstract
A heating device used for production of a disc shutter made of synthetic resin and shaped into a U-form in section, arranged to heat a pair of corner portions of the shutter to extinguish residual stresses that exist in the corner portions that are formed where a connecting portion of the shutter connects a pair of shutter plates. The heating device comprises a movable support for fixedly supporting the free ends of the pair of shutter plates, a fixed heater which heats the corner portions of the shutter at a predetermined temperature, a pair of heating surfaces connected to form an acute angle, a temperature setting device, and a heating duration setting device.