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. 20, 2012
Filed:
Dec. 09, 2009
Makoto Hayashida, Susono, JP;
Nobuharu Hoshi, Numazu, JP;
Akira Suzuki, Naka-gun, JP;
Emi Watanabe, Suntou-gun, JP;
Kenji Aoki, Mishima, JP;
Makoto Hayashida, Susono, JP;
Nobuharu Hoshi, Numazu, JP;
Akira Suzuki, Naka-gun, JP;
Emi Watanabe, Suntou-gun, JP;
Kenji Aoki, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is a sealing member for preventing leakage of a developer from a developer containing portion of a process cartridge detachable from a main body of an electrophotographic image forming apparatus to an outside of the developer containing portion. The sealing member is made of a thermoplastic elastomer that contains at least a copolymer and a plasticizer. In a molecular weight distribution of a tetrahydrofuran soluble matter of the thermoplastic elastomer measured by gel permeation chromatography, at least one peak is present in each of a region of a molecular weight of 4,000 or less and a region of a molecular weight of 30,000 to 200,000, and a percentage of a component of a molecular weight of 800 or less in a region of a molecular weight of 5,000 or less is 30% or less.