Patents by Inventor Robert P. Davis

Robert P. Davis 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).

  • Patent number: 4311872
    Abstract: A throat microphone consists of a dynamic pressure transducer sealed within an airtight tympanic enclosure to be held by an elastic band on the user's throat near the voice box. The electrical signals generated by the transducer are applied as an input signal to an amplifier and speaker unit where the signal is conditioned by a preamplifier stage for further amplification by a second stage that contains a variable reactive negative feedback network that acts as a low pass filter and corrects the phase shift of the different lower frequency audio signal components while emphasizing the higher frequency components so that severe phase distortion of the signal applied to the drive speaker through an output power amplifier stage can be minimized to make the speech sounds reproduced more intelligible.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: January 19, 1982
    Inventor: Robert P. Davis
  • Patent number: D257651
    Type: Grant
    Filed: March 28, 1979
    Date of Patent: December 23, 1980
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D257652
    Type: Grant
    Filed: March 28, 1979
    Date of Patent: December 23, 1980
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D257915
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: January 20, 1981
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D260948
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: September 29, 1981
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D266971
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: November 23, 1982
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D270872
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: October 11, 1983
    Assignee: Hartman Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D270873
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: October 11, 1983
    Assignee: Hartman Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D270970
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: October 18, 1983
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D273057
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: March 20, 1984
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D273151
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: March 27, 1984
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D273152
    Type: Grant
    Filed: February 12, 1982
    Date of Patent: March 27, 1984
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D278480
    Type: Grant
    Filed: October 21, 1982
    Date of Patent: April 23, 1985
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D278857
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: May 21, 1985
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D278858
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: May 21, 1985
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D278859
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: May 21, 1985
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D278860
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: May 21, 1985
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D278862
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: May 21, 1985
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D281741
    Type: Grant
    Filed: July 27, 1981
    Date of Patent: December 17, 1985
    Assignee: Hartmann Luggage Company
    Inventors: Ira R. Katz, Robert P. Davis
  • Patent number: D284136
    Type: Grant
    Filed: May 19, 1983
    Date of Patent: June 10, 1986
    Assignee: Lenox, Inc.
    Inventors: Ira R. Katz, Robert P. Davis