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. 10, 2023
Filed:
Feb. 27, 2020
Applicant:
Ngk Insulators, Ltd., Nagoya, JP;
Inventor:
Joyo Ito, Nagoya, JP;
Assignee:
NGK INSULATORS, LTD., Nagoya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 21/67 (2006.01); H01L 21/683 (2006.01);
U.S. Cl.
CPC ...
H01L 21/6831 (2013.01); H01L 21/67109 (2013.01);
Abstract
A wafer placement apparatus includes a ceramic plate having a top surface including a wafer placement surface, the ceramic plate allowing at least one of an electrostatic electrode and a heater electrode to be embedded therein; and a cooling plate disposed on an undersurface of the ceramic plate opposite to the wafer placement surface to cool the ceramic plate, wherein the cooling plate includes a coolant channel, and the coolant channel has a multi-layer structure at least partially including two or more layers stacked vertically, the two or more layers being spaced different distances apart from the wafer placement surface.