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:
May. 14, 2019
Filed:
Jul. 28, 2016
Screen Holdings Co., Ltd., Kyoto, JP;
SCREEN Holdings Co., Ltd., , JP;
Abstract
After hydrophobization of surfaces of patterns, a liquid film of pure water or the like is formed on the surfaces of the substrate. At this stage, the liquid of the liquid film cannot be present between the patterns because of hydrophobization, and gas is present there. With the front surface of the substrate covered with the liquid film, a liquid to which ultrasonic waves are applied is supplied to the back surface of the substrate, whereby the back surface of the substrate is cleaned due to the cavitation collapse energy in the liquid caused by the ultrasonic waves. While collapse of cavitation occurs at the front surface of the substrate, the presence of the gas between the patterns prohibits collapse of cavitation between the patterns, the liquid film can prevent contamination while preventing collapse of the patterns, and the back surface of the substrate is cleaned favorably.