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:
May. 24, 2022
Filed:
Oct. 25, 2018
Sumitomo Electric Industries, Ltd., Osaka, JP;
Sumitomo Electric Fine Polymer, Inc., Osaka, JP;
Atsushi Fukunaga, Osaka, JP;
Fumihiro Hayashi, Osaka, JP;
SUMITOMO ELETRIC INDUSTRIES, LTD., Osaka, JP;
SUMITOMO ELECTRIC FINE POLYMER, INC., Osaka, JP;
Abstract
A method of making an oil repellent sheet material according to an embodiment of the present disclosures includes a step of applying to a porous sheet a composition for forming an oil repellent layer, the composition containing a solvent and an amorphous fluorine resin dispersed therein, and a step of swaging the porous sheet after the step of applying, wherein the porous sheet has a fibrous skeleton composed mainly of polytetrafluoroethylene, the method of making an oil repellent sheet material further comprising a heat treatment step of heating the porous sheet to which the composition for forming an oil repellent layer is applied, before or after the step of swaging.