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:
Dec. 07, 2010
Filed:
Apr. 25, 2005
Keita Ishizuka, Kawasaki, JP;
Kazumasa Wakiya, Kawasaki, JP;
Kotaro Endo, Kawasaki, JP;
Masaaki Yoshida, Kawasaki, JP;
Keita Ishizuka, Kawasaki, JP;
Kazumasa Wakiya, Kawasaki, JP;
Kotaro Endo, Kawasaki, JP;
Masaaki Yoshida, Kawasaki, JP;
Tokyo Ohka Kogyo Co., Ltd., Kanagawa, JP;
Abstract
The liquid immersion lithography process is configured so that the resist pattern resolution is improved by exposing a resist film to the lithographic exposure light under the conditions in which the predetermined thickness of the liquid for liquid immersion lithography, of which the refractive index is higher than that of air and smaller than that of the resist film is intervened at least on the resist film in a path of the lithography exposure light reaching the resist film, a protective film is formed on the surface of the resist film to be used. Therefore, when various immersion liquid, water being the representative example is used in the liquid immersion lithography process can be formed, the deterioration of the resist film and the immersion liquid to be used are simultaneously prevented, and the number of the process steps are not increased, and then the resist pattern having higher resolving ability.