Patents by Inventor Sten Erik Porrvik

Sten Erik Porrvik 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).

  • Method for the preparation of paper containing plastic particles
    Patent number: 3941634
    Abstract: Forming a plastic containing paper product by introducing expandable plastic pellets between two partially dewatered webs of cellulose fibers, pressing together and heating.
    Type: Grant
    Filed: October 25, 1974
    Date of Patent: March 2, 1976
    Assignee: Kemanord Aktiebolag
    Inventors: Henrik Gustaf Folke Nisser, Jorgen Petersen, Sten Erik Porrvik