Patents by Inventor Albert V. D. Scheer

Albert V. D. Scheer 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 preparing non-porous membrane layers
    Patent number: 4980235
    Abstract: The invention relates to a process for preparing non-porous membrane layers by applying a solution comprising a solvent and a (e.g. silicon-containing) polymer having a weight-average molecular weight of at least 300,000 Da onto a porous substrate(e.g. polypropylene) and allowing the solvent to evaporate.
    Type: Grant
    Filed: March 10, 1989
    Date of Patent: December 25, 1990
    Assignee: Shell Oil Company
    Inventors: Albert V. D. Scheer, Thijme Last