Patents by Inventor Ronald Bernz Holzwarth

Ronald Bernz Holzwarth 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).

  • Apertured films having durable wettability and processes for marking them
    Patent number: 5792412
    Abstract: This invention relates to a process for forming a single-layer, durably wettable polymeric web having a plurality of apertures. This process comprises melting a mixture of at least one thermoplastic polymer and at least one migratable surfactant and extruding the mixture to form a single-layer, substantially continuous polymeric film. The film is then apertured using high pressure fluid flows. Aperture formation is conducted when the single-layer polymeric film has a contact angle of at least about 30.degree., to minimize wash-off of the surfactant impregnated in the polymer web. The invention also relates to durably-wettable apertured webs.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: August 11, 1998
    Assignee: The Procter & Gamble Company
    Inventors: Yann-Per Lee, Ronald Bernz Holzwarth, Lanying Wu