Patents by Inventor Luc M. De Groot

Luc M. De Groot has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for making curled photographic film
    Patent number: 4892689
    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.
    Type: Grant
    Filed: July 14, 1988
    Date of Patent: January 9, 1990
    Assignee: AGFA-Gevaert N.V.
    Inventors: Jan B. Van Cappellen, Luc M. De Groot, Gery Vancoppenolle, Daniel G. Vandenbrande, Jan K. De Keyzer