Patents by Inventor Richard P. Westhoff

Richard P. Westhoff 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).

  • Starch-based semipermeable films
    Patent number: 4454268
    Abstract: Semipermeable films useful as dialysis membranes are prepared from starch-based composites. The films are shaped by conventional methods from a plasticized matrix comprising highly gelatinized starch and ethylene acrylic acid copolymer neutralized with a strong alkali. These films are remarkably transparent and resistant to degradation in the presence of aqueous solutions.
    Type: Grant
    Filed: June 23, 1983
    Date of Patent: June 12, 1984
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Felix H. Otey, Richard P. Westhoff
  • Biodegradable starch-based blown films
    Patent number: 4337181
    Abstract: Film-forming formulations comprising starch, ethylene acrylic acid copolymer, and optionally polyethylene, can be blown into films upon neutralization of a portion of the copolymer acid functionality. The resultant biodegradable films have potential application as agricultural mulch, garbage bags, and various types of packaging.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: June 29, 1982
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Felix H. Otey, Richard P. Westhoff
  • Biodegradable film compositions prepared from starch and copolymers of ethylene and acrylic acid
    Patent number: 4133784
    Abstract: Biodegradable film compositions which will withstand outdoor exposure for a desired time and then disintegrate are prepared from starch and ethylene acrylic acid copolymers. These film compositions are useful for agricultural mulch and heat-sealable packaging.
    Type: Grant
    Filed: September 28, 1977
    Date of Patent: January 9, 1979
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Felix H. Otey, Richard P. Westhoff