Patents Assigned to MEMTEC North America Corp.
  • Polytetrafluoroethylene coating of polymer surfaces
    Patent number: 4855162
    Abstract: Adherent, PTFE coatings on polymer surfaces can be produced at temperatures well below the sintering temperature of PTFE, by contacting the surface with a dilute dispersion of PTFE particles and heating the surface to its softening point (in the vicinity of its glass transition temperature) to dry it and to cause the individual particles to become embedded in and surrounded by the polymer.
    Type: Grant
    Filed: July 17, 1987
    Date of Patent: August 8, 1989
    Assignee: Memtec North America Corp.
    Inventors: Wolfgang J. Wrasidlo, Frieder K. Hofmann, Karol J. Mysels
  • Selective twist filtration roving
    Patent number: 4801383
    Abstract: This invention relates to a filtration roving with the cross section of the roving exhibiting portions more tightly twisted than the remainder of the roving.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: January 31, 1989
    Assignee: MEMTEC North America Corp.
    Inventors: Michael A. Hoffmann, Robert J. Schmitt