Patents by Inventor Kirk T. Butcher

Kirk T. Butcher 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).

  • Mechanically locked bell and spigot coupling for ducts and method of forming
    Patent number: 4110144
    Abstract: A bell and spigot coupling is provided with an abrasive-material insert to increase the disengagement force necessary to uncouple the ducting.
    Type: Grant
    Filed: March 28, 1977
    Date of Patent: August 29, 1978
    Assignee: Canadian General Electric Company Limited
    Inventors: Amsey Buehler, Kirk T. Butcher