Patents by Inventor Richard C. Progelhof

Richard C. Progelhof 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).

  • Molding of thermoset materials
    Patent number: 5076096
    Abstract: Various methods have been proposed for measuring the viscosity of thermosetting polymers. It has been found that these method are generally inaccurate. A test which avoids the inaccuracies of previous techniques is proposed. In this test the heated thermosetting resin is forced at a known flow rate through a runner and through a capillary tube at the end of the runner. By measuring the pressure differential across the capillary a meaningful measure of viscosity is obtained.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: December 31, 1991
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Lee L. Blyler, Jr., Philip Hubbauer, Gerhard W. Poelzing, Richard C. Progelhof
  • Optical fiber manufacturing technique
    Patent number: 4761168
    Abstract: The speed at which optical fibers can be drawn and coated is significantly increased by efficiently stripping the gas boundary layer entrained by the moving fiber. The stripping is periodically repeated to ensure that the entrained flow is not re-established.
    Type: Grant
    Filed: September 22, 1986
    Date of Patent: August 2, 1988
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Lee L. Blyler, Jr., Arthur C. Hart, Jr., Richard C. Progelhof