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:
Jul. 14, 1987
Filed:
Jul. 19, 1985
Applicant:
Inventors:
Assignee:
Idemitsu Petrochemical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264180 ; 264557 ; 264562 ; 2642103 ; 264235 ; 425 71 ;
Abstract
The invention provides a method for the preparation of a sheet of a crystalline thermoplastic resin, e.g. polypropylene, having excellent transparency and surface properties as well as thermoformability. The inventive method comprises quenching of a molten resin sheet extruded out of a T-die by introducing the same into a slit where cooling water is flowing at a velocity higher than the running velocity of the extruded molten resin sheet and then stretching the thus quenched resin sheet in a stretch ratio in the range from 1.02 to 1.5 times.
Quick Actions:
Fujii, Atsushi. (1987). Method for the preparation of a crystalline thermoplastic resin sheet (U.S. Patent No. 4680157). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4680157
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile