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. 22, 2007
Filed:
Aug. 18, 2003
Takahiro Kume, Touyo, JP;
Hidenori Takeda, Imabara, JP;
Takahiro Kume, Touyo, JP;
Hidenori Takeda, Imabara, JP;
Fuji Spinning Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a polishing sheet that can secure a flatness of a material to be polished and can improve a polishing efficiency. A polishing padhas a polyurethane sheetmade of polyurethane resin. The polyurethane sheethas large cellswith a generally triangular sectional configuration rounded along a thickness direction thereof. Polyurethane resin exists in the polyurethane sheetin a partition wall manner and fine foamsare formed in the polyurethane resin. Fine particlesadded during manufacture of the polyurethane sheetexist inside some of the fine foamsand the fine particlesare separable from the fine foams. By separating off fine particles positioned at a polishing face P by dummy polishing or the like, fine foams which evenly reserve a polishing liquid containing abrasive particles are formed at the polishing face P.