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. 03, 2023
Filed:
Sep. 08, 2021
Toto Ltd., Kitakyushu, JP;
Akihito Ono, Kitakyushu, JP;
Jumpei Uefuji, Kitakyushu, JP;
Toto Ltd., Fukuoka, JP;
Abstract
An electrostatic chuck includes a ceramic dielectric substrate; a base plate; and a heater unit which heats the ceramic dielectric substrate. The heater unit includes a first heater element. The first heater element has a plurality of sub-zones. The sub-zones include a first sub-zone. The first sub-zone includes a sub-heater line generating heat by allowing a current to flow, a first sub-power feeding portion feeding a power to the sub-heater line, and a second sub-power feeding portion feeding a power to the sub-heater line. The first sub-zone has a central region located centrally in the first sub-zone and an outer peripheral region located outside the central region when viewed along a Z-direction perpendicular to the first major surface. At least one of the first sub-power feeding portion and the second sub-power feeding portion is provided in the central region.