Patents by Inventor Robert A. Watson

Robert A. Watson 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).

  • Electric resistance heater
    Patent number: 4401883
    Abstract: A horizontal porcupine coil of electric resistance heating wire is supported against sagging by two superimposed coil-center ceramic tubes containing a conductor for one end of the coil. If one tube cracks it is improbable that the other would crack in the same place, and this keeps to a minimum the possibility of short-circuiting between the conductor and coil.
    Type: Grant
    Filed: August 14, 1981
    Date of Patent: August 30, 1983
    Assignee: The Kanthal Corporation
    Inventor: Robert A. Watson
  • Palm brush
    Patent number: D961272
    Type: Grant
    Filed: March 3, 2020
    Date of Patent: August 23, 2022
    Assignee: Crown Quality Products Inc
    Inventor: Robert A. Watson
  • Brush
    Patent number: D1028531
    Type: Grant
    Filed: March 10, 2022
    Date of Patent: May 28, 2024
    Inventor: Robert A. Watson