Patents by Inventor Jozef Carolus Van Wijk

Jozef Carolus Van Wijk 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).

  • Apparatus for the edges of thermoplastic webs
    Patent number: 4021179
    Abstract: The edge knurling of a thermoplastic web must often be carried out at elevated pressure in order to ensure a sufficient knurling depth even after the web has been wound and unwound different times. The prior heating of the web margins permits knurling to be carried out at lower pressures but may adversely influence the crystallinity of a film and also requires an increased amount of energy.The heating of the knurling wheel or tool itself reduces such disadvantages.
    Type: Grant
    Filed: March 23, 1976
    Date of Patent: May 3, 1977
    Assignee: AGFA-GEVAERT N.V.
    Inventors: Francois Jean Pira, Jozef Carolus Van Wijk