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:
Mar. 06, 2012
Filed:
May. 12, 2005
David Cheung, Foster City, CA (US);
Kirk J Ostrowski, San Jose, CA (US);
David Cheung, Foster City, CA (US);
Kirk J Ostrowski, San Jose, CA (US);
Novellus Systems, Inc., San Jose, CA (US);
Abstract
A method of cleaning a low dielectric constant film in a lithographic process includes providing a dielectric film having thereover a resist composition, the dielectric film having a dielectric constant no greater than about 4.0, and stripping the resist composition to leave a substantially silicon-containing ash residue on the dielectric film. The method then includes contacting the ash residue with plasma comprising an ionized, essentially pure noble gas such as helium to remove the resist residue without substantially affecting the underlying dielectric film.