Patents by Inventor Brenda Ruf

Brenda Ruf 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).

  • Biaxally-oriented polypropylene films containing a non-crystallizable, amorphous polyester layer, and method of making the same
    Patent number: 6872458
    Abstract: A method of making a multilayer film is provided, including the steps of forming a core layer of a polypropylene film, monoaxially orienting the core layer in a first direction, and providing at least one multilayer cap layer to at least one side of the core layer to provide a multilayer film. The cap layer includes a non-crystallizable, amorphous polyester layer having a sufficient proportion of a non-crystallizable, amorphous polyester to render the amorphous polyester layer non-crystallizable and a first tie layer interposed between the polyester layer and the core layer, the first tie layer including an adhesive. The multilayer film is then oriented in a second direction transverse to the first direction.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: March 29, 2005
    Assignee: Applied Extrusion Technologies, Inc.
    Inventors: David Rudd, Brenda Ruf