Patents by Inventor Wilhelm Franschitz

Wilhelm Franschitz 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 manufacturing a partially permeable membrane
    Patent number: 4722771
    Abstract: A process for manufacturing a partially permeable membrane is such that a 20-200 .mu.m thick aluminum foil in the non-recrystallized condition is etched in an electrolyte at a current density in the range 2-20 kA/m.sup.2 and the surface given an after-treatment to prevent hydration reactions. The membrane is particularly suitable for ultrafiltration, gas separation or pervaporation and to that end can also be employed in combination with a polymer membrane.
    Type: Grant
    Filed: November 18, 1986
    Date of Patent: February 2, 1988
    Assignee: Swiss Aluminium Ltd.
    Inventors: Marcus Textor, Martin Werner, Wilhelm Franschitz
  • Process for manufacturing a microfilter
    Patent number: 4717455
    Abstract: A process for manufacturing a microfilter is such that a foil having an aluminum content of at least 99.95% and thickness 20-250 .mu.m is given a recrystallizing anneal, is etched in an electrolyte in stages at constant current density in the range 0.01 to 2 kA/m.sup.2, and the surface given a stabilizing after treatment to prevent hydration reactions.
    Type: Grant
    Filed: November 18, 1986
    Date of Patent: January 5, 1988
    Assignee: Swiss Aluminium Ltd.
    Inventors: Marcus Textor, Martin Werner, Wilhelm Franschitz