Patents by Inventor Richard L. Volgren

Richard L. Volgren 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).

  • Reversibly transparent-translucent film and method of making same
    Patent number: 4206980
    Abstract: Normally transparent films which can be rendered translucent by stretching and transparent by relaxing the film are provided. The films comprise a blend of crystallizable polymer with a compound with which the polymer is miscible at a temperature above the crystallization temperature of the crystallizable polymer-compound blend but immiscible at a temperature below the crystallization temperature of the blend. The films are prepared by blending the crystallizable polymer with the compound under melt conditions, casting a film of the blend and cooling to solidify the blend.
    Type: Grant
    Filed: April 24, 1978
    Date of Patent: June 10, 1980
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Dennis L. Krueger, Richard L. Volgren