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. 15, 2022
Filed:
Oct. 03, 2018
Screen Holdings Co., Ltd., Kyoto, JP;
Yukio Ono, Kyoto, JP;
SCREEN Holdings Co., Ltd., Kyoto, JP;
Abstract
Before a start of a treatment of a semiconductor wafer to be treated first in a lot, a dummy wafer is transported into a chamber, and an atmosphere including a helium gas having high thermal conductivity is formed. When the dummy wafer is heated with light irradiation from halogen lamps, heat transfer from the dummy wafer the temperature of which has increased occurs at an upper chamber window and a lower chamber window, with the helium gas as a heating medium. At the time when the semiconductor wafer to be treated first is transported into the chamber, the upper chamber window and the lower chamber window are heated, which makes a temperature history of all the semiconductor wafers in the lot uniform. It is thus possible to omit dummy running.