Patents by Inventor Ronald Bernd Holzwarth

Ronald Bernd 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).

  • Absorbent articles comprising apertured films having durable wettability
    Patent number: 5879782
    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: August 11, 1998
    Date of Patent: March 9, 1999
    Assignee: The Procter & Gamble Company
    Inventors: Yann-Per Lee, Ronald Bernd Holzwarth, Lanying Wu
  • Apertured films having durable wettability and processes for making them
    Patent number: 5834092
    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 surfict 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: May 29, 1998
    Date of Patent: November 10, 1998
    Assignee: The Procter & Gamble Company
    Inventors: Yann-Per Lee, Ronald Bernd Holzwarth, Lanying Wu