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:
Oct. 23, 2018
Filed:
Jan. 27, 2016
Kiyotaka Sawada, Kanagawa, JP;
Jun Zhang, Kanagawa, JP;
Hidekazu Masuo, Kanagawa, JP;
Wataru Kikuta, Tokyo, JP;
Tatsuya Tanaka, Kanagawa, JP;
Tomihiro Takahashi, Kanagawa, JP;
Tsuyoshi Hashiyada, Tokyo, JP;
Yutaro Hoshino, Kanagawa, JP;
Kyohta Koetsuka, Kanagawa, JP;
Kiyotaka Sawada, Kanagawa, JP;
Jun Zhang, Kanagawa, JP;
Hidekazu Masuo, Kanagawa, JP;
Wataru Kikuta, Tokyo, JP;
Tatsuya Tanaka, Kanagawa, JP;
Tomihiro Takahashi, Kanagawa, JP;
Tsuyoshi Hashiyada, Tokyo, JP;
Yutaro Hoshino, Kanagawa, JP;
Kyohta Koetsuka, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A polishing sheet includes a sheet including one side having a surface, a plurality of convex portions provided to project from the surface of the one side of the sheet, a plurality of first abrasive grains provided on an upper surface of each of the convex portions, and a plurality of second abrasive grains provided on the surface of the sheet. The second abrasive grains each have hardness higher than that of the first abrasive grains.