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:
Mar. 26, 1991
Filed:
Apr. 18, 1989
Applicant:
Inventor:
Mitsuru Yamashita, Hyogo, JP;
Assignee:
Daicel Chemical Industries, Ltd., Sakai, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264-22 ; 264 405 ; 2643287 ; 425149 ; 425150 ;
Abstract
A process for molding a transparent plastic substrate for a high-density information recording-reading system by injecting molten resin into a molding cavity defined by a pair of mold halves, characterized in that an axial dimension of the molding cavity is increased at least two times between the start of a shot of the molten resin and the end of the pressure-holding stage in an injection molding cycle.