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. 07, 1989
Filed:
Nov. 27, 1987
Junichiro Kudo, Miyagi, JP;
Yoshihiro Shimizu, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A method for molding a substrate for optical information record carrier is disclosed which results in small double refraction with superior transfer characteristics of a surface of a stamper. The method comprises the steps of injecting molten resin into a cavity formed by a stationary mold and movable mold under application of mold clamp pressure between said molds, releasing the mold clamp pressure at predetermined timing after injection of said molten resin is completed and the molten resin is partially solidified, holding said resin in the molds under the released mold clamp pressure condition until the resin is solidified, and taking out the molded substrate from the molds.