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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.:

US 10569023 B1

PDFFull Text
Date of Patent:
Feb. 25, 2020

Filed:

Jan. 22, 2015

Medical syringe, gasket used for syringe and method for producing same

Applicant:

Sumitomo Rubber Industries, Ltd., Kobe-shi, Hyogo, JP;

Inventors:

Hiroaki Nakano, Kobe, JP;

Seiji Hara, Kobe, JP;

Hiroyuki Kaneko, Kobe, JP;

Assignee:

SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-Shi, Hyogo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Emily L Schmidt

Assistant Examiner:

Tiffany Legette

Int. Cl.
CPC ...
A61M 5/315 (2006.01); B29B 13/08 (2006.01); B29C 35/00 (2006.01); B29C 35/02 (2006.01); B29C 59/00 (2006.01); B29C 59/02 (2006.01); B29C 59/16 (2006.01); B29L 31/00 (2006.01); B29C 45/14 (2006.01); B29K 105/24 (2006.01); B29L 31/26 (2006.01);
U.S. Cl.
CPC ...
A61M 5/31513 (2013.01); B29B 13/08 (2013.01); B29C 35/002 (2013.01); B29C 35/02 (2013.01); B29C 59/007 (2013.01); B29C 59/02 (2013.01); B29C 59/16 (2013.01); A61M 2207/00 (2013.01); B29C 45/14 (2013.01); B29K 2105/24 (2013.01); B29L 2031/265 (2013.01); B29L 2031/7544 (2013.01);
Abstract

In a conventional laminated gasket production method, when a product of a laminated gasket is demolded from a mold, the product is rubbed against the mold and, therefore, minute scratches are formed on a surface of the laminated gasket. These minute scratches are liable to prevent reliable sealing of a liquid drug. The present invention is a method for producing a gasket to be used for a medical syringe and is characterized by including the steps of: preparing a gasket molding mold; molding a gasket having a circumferential surface portion in the mold with the gasket being laminated with a lamination film; and demolding the gasket from the mold, and then forming a groove only in the lamination film circumferentially of the circumferential surface portion of the gasket.

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