Patents by Inventor Robert H. Weir

Robert H. Weir 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).

  • Speaker simulator
    Patent number: 5649015
    Abstract: A speaker simulator receives a high power musical signal from a power amplifier, and a reduced power signal is extracted by a pad circuit and directed to a high-pass filter and a fan circuit which drives a cooling fan. The output of the high-pass filter is directed to a servo amplifier and a series of notch filters, prior to output from the speaker simulator. The angular momentum of the blades of the cooling fan provides an history-dependent impedance, i.e., an impedance dependent on the past values of the signal driving the fan. The history-dependent impedance produces an aesthetically pleasing distortion of the speaker simulator output.
    Type: Grant
    Filed: September 15, 1995
    Date of Patent: July 15, 1997
    Assignee: Midnite Kitty, Inc.
    Inventors: Thomas L. Paddock, Robert H. Weir
  • Method for preparing poly(tetramethylene ether) glycol
    Patent number: 4120903
    Abstract: Poly(tetramethylene ether) glycol is prepared by polymerizing tetrahydrofuran, using(1) a polymeric catalyst which contains sulfonic acid groups, and(2) a chain terminator which is water or 1,4-butanediol.
    Type: Grant
    Filed: March 30, 1977
    Date of Patent: October 17, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Gerfried Pruckmayr, Robert H. Weir