Patents by Inventor Roy E. Larson

Roy E. Larson 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).

  • Dual membrane process for removing organic compounds from the water
    Patent number: 5158681
    Abstract: An apparatus and process for treating water contaminated with hydrocarbons utilizes a dual membrane apparatus wherein contaminated water is first treated by a cellulose based membrane to produce a permeate fraction that is clarified and has a reduced content of hydrocarbons. The clarified permeate fraction is then treated with a reverse osmosis or nanofiltration membrane to produce a purified permeate water having an additionally lowered content of hydrocarbons.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: October 27, 1992
    Assignee: Separation Dynamics International Ltd.
    Inventors: Scott D. N. Freeman, Roy E. Larson
  • Process for manufacturing ultrathin polymer membranes and products derived therefrom
    Patent number: 3933561
    Abstract: Unsupported ultrathin polymer film is made in bulk form by floating the film on a bath, transferring the floating film to a release substrate, drying the resulting film/substrate composite, separating the film from the substrate, and retrieving the unsupported film, e.g. in the form of a convoluted roll provided with anti-blocking agent in between the convolutions. The bulk product can be made into thermal insulating material, flake-like weather modifying agents, etc.
    Type: Grant
    Filed: March 27, 1974
    Date of Patent: January 20, 1976
    Assignee: North Star Research Institute
    Inventors: Roy E. Larson, Ralph H. Forester, Jr.