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. 21, 1992
Filed:
Apr. 17, 1989
Applicant:
Inventors:
Yoshio Onisawa, Hyogo, JP;
Yoshinobu Yukinaga, Hyogo, JP;
Assignee:
Daicel Chemical Industries, Ltd., Sakai, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264106 ; 2643281 ; 264334 ; 425556 ; 425810 ;
Abstract
Improvement in a method for molding a plastic substrate for an optical disk having a concave-convex pattern on a side surface thereof including a step of feeding liquid resin into a molding cavity defined by a pair of mold halves, characterized in that, when the molded plastic substrate is released from the mold halves, the molded plastic substrate is released at least simultaneously in time from both of the mold halves in a mold-opening stage.