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:
Feb. 10, 2026
Filed:
Dec. 28, 2020
Sumco Corporation, Tokyo, JP;
Yuji Miyazaki, Saga, JP;
Masaru Morita, Saga, JP;
SUMCO CORPORATION, Tokyo, JP;
Abstract
In a double-side polishing apparatus includes at least one work thickness measuring instrument in real time during double-side polishing of the work; an inner circumferential surface defined by the through hole in said one of the upper plate and the lower plate is provided with a metal cylindrical member; and either of: a lower window provided in a lower part of the cylindrical member provided in the upper plate and an upper window provided in an upper part of the cylindrical member provided to cover the upper side of the through hole provided in the upper plate, or an upper window provided in an upper part of the cylindrical member provided in the lower plate and a lower window provided to cover the lower side of the through hole provided in the lower plate.