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. 25, 2007
Filed:
Feb. 24, 2005
Applicants:
Michael T. Sheehan, Corpus Christi, TX (US);
James R. Sounik, Corpus Christi, TX (US);
Inventors:
Michael T. Sheehan, Corpus Christi, TX (US);
James R. Sounik, Corpus Christi, TX (US);
Assignee:
DuPont Electronic Polymers L.P., Research Triangle Park, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 112/08 (2006.01); C08C 19/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
An anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity comprising the steps of polymerization, purification, transesterification, purification, catalyst removal, and solvent exchange. The resultant polymer in solution can be used directly, without further processing steps, to prepare a photoresist composition.