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. 05, 1996
Filed:
Nov. 14, 1994
Akira Yanagimoto, Tokyo, JP;
Takashi Harunari, Tokyo, JP;
Akihiro Konno, Tokyo, JP;
Toshiyasu Okamura, Tokyo, JP;
Nissan Chemical Industries Ltd., Tokyo, JP;
Abstract
A method for removing a liquid crystal alignment film from a liquid crystal cell substrate having the alignment film formed by coating a solution containing, as the main component, a polyamic acid having, as the main repeating units, a chemical structure of the following formula (1): ##STR1## wherein each of R.sub.1 and R.sub.2 is a hydrogen atom or a methyl group, R.sub.3 is a bivalent organic group constituting a diamine, and n is from 10 to 1,000, followed by baking, which method comprises irradiating said liquid crystal cell substrate with ultraviolet rays having wavelengths within a range of from 230 to 300 nm and then treating it with an aprotic highly polar organic solvent or an alkaline solvent.