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:
Nov. 07, 1989
Filed:
Aug. 19, 1985
Applicant:
Inventors:
Assignee:
Daicel Chemical Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ; B32B / ;
U.S. Cl.
CPC ...
156 85 ; 156 86 ; 156108 ; 264-17 ; 264-21 ; 264311 ; 264330 ;
Abstract
A process for producing a thin film of unoriented cellulose ester held under uniform tension, the process including the steps of: casting a solution of cellulose ester in an organic solvent over a smooth glass plate and thereafter removing the solvent to form a thin film of a uniform thickness on the glass plate; permitting the thin film to separate from the glass plate by immersing the same into water; and recovering the thin film from the water and setting the wet film on a supporting mount, followed by drying the same.