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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.:

US 4892689 B1

PDFFull Text
Date of Patent:
Jan. 09, 1990

Filed:

Jul. 14, 1988

Process for making curled photographic film

Applicant:
Inventors:

Jan B Van Cappellen, Schilde, BE;

Luc M De Groot, Aarschot, BE;

Gery Vancoppenolle, Weerde, BE;

Daniel G Vandenbrande, Mortsel, BE;

Jan K De Keyzer, Schilde, BE;

Assignee:

AGFA-Gevaert N.V., Mortsel, BE;

Attorney:

Daniel; William J.

Primary Examiner:

Jeffery Thurlow

Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264 25 ; 264129 ; 264134 ; 264146 ; 2642105 ; 2642358 ; 264285 ; 2642896 ; 2642902 ; 264346 ; 264D / ;
Abstract

In a known process of making biaxially oriented polyethylene terephthalate photographic film, a certain amount of curl in the longitudinal direction can be imparted to the film by carrying out the longitudinal stretching step of that process while the film is asymmetrically heated across its thickness to a temperature gradient Delta T across the film of at least 10.degree. C. while the longitudinal stretching tension applied to the film is less than 10 N/sq.mm.

Find Patent Forward Citations

Van Cappellen, Jan. (1990). Process for making curled photographic film (U.S. Patent No. 4892689). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4892689

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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