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. 27, 1993
Filed:
Sep. 11, 1991
Masaki Nishiguchi, Tokyo, JP;
Yoshiaki Ohishi, Tokyo, JP;
Kazuo Chiba, Tokyo, JP;
Michio Yamaguchi, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A method of manufacturing thermoplastic resin molded optical members comprising a thermoplastic resin material into a mold, defoaming thermoplastic resin material in vacuo at a specific temperature for causing the loaded thermoplastic resin material to melt and to flow, and producing a molded optical member by gradually cooling off the mold in the upward direction from the bottom side while pressurizing the interior of the mold with an inert gas. The inner surface of the mold is preferably preliminarily coated with a release material such as fluoroplastic containing either fluorinated alicyclic group or a fluorinated heterocyclic group in the main chain.