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. 21, 2017
Filed:
Jan. 19, 2016
Sumitomo Rubber Industries, Ltd., Kobe-shi, Hyogo, JP;
Hiroaki Nakano, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-shi, Hyogo, JP;
Abstract
When a laminated gasket product is demolded from a mold in production thereof by a conventional production process, the gasket product is rubbed against the mold and, therefore, minute scratches are formed on a surface of the gasket product. The minute scratches may impair the reliable sealability of a liquid drug. A method for producing a gasket () for use in a prefilled syringe () includes the steps of: preparing a gasket forming mold; molding a gasket () in the mold, the gasket having a surface laminated with a lamination film () and including a circumferential surface portion (); demolding the gasket () from the mold, and then simultaneously forming a groove () and a projection () each extending circumferentially of the gasket in a portion of the lamination film () present in the circumferential surface portion () of the gasket.