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. 19, 1993
Filed:
Mar. 20, 1992
Yoshiyuki Tani, Kadoma, JP;
Masayuki Endou, Kadoma, JP;
Kazufumi Ogawa, Kadoma, JP;
Yasuhisa Tanaka, Tokyo, JP;
Toshinobu Ishihara, Tokyo, JP;
Tohru Kubota, Tokyo, JP;
Abstract
There is disclosed a polymer having linear --Si--O--Si-- bonds and --Si--Si--Si-- bonds, or polysilane bonds that are greater than trisilane bonds, sensitive to far ultraviolet rays. The polymer is prepared by polymerizing a dichlorosiloxane alone or with at least one dichlorosilane in an inert solvent in the presence of sodium. The polymer undergoes oxidation with oxygen plasma to form SiO.sub.2 resistant to oxygen dry etching, exhibits absorption peaks only in far ultraviolet, and is suitable for preparing a single layered resist or an upper resist of a two-layered system.