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:
Feb. 12, 1991
Filed:
Jun. 07, 1988
Applicant:
Inventors:
Akitoshi Sugio, Ohmiya, JP;
Ryozo Kawai, Nagareyama, JP;
Masaki Nagata, Tokyo, JP;
Tamaki Kamimura, Tokyo, JP;
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ; G02B / ;
U.S. Cl.
CPC ...
264-13 ; 8489 ; 264 78 ; 427163 ;
Abstract
A polarizing film comprising a polyvinyl alcohol-type film and a dichroic dye, a metallic ion and boric acid incorporated therein, and a process for producing the same, which comprises adsorbing a dichroic dye on a polyvinyl alcohol-type film, stretching the film substantially in one direction, immersing the stretched film in an aqueous solution containing a metallic ion and boric acid.