Patents by Inventor John D. Burr

John D. Burr 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).

  • Knife with retractable sheath
    Patent number: 4523379
    Abstract: A safety utility knife includes a handle, a blade fixed to the forward end of the handle, and a retractable sheath which is received within the handle. A mechanism is provided for automatically retracting the sheath within the handle by depressing a single button at the rear of the handle.
    Type: Grant
    Filed: May 2, 1984
    Date of Patent: June 18, 1985
    Assignee: Tekna
    Inventors: Ralph F. Osterhout, John D. Burr, Eric R. Larson
  • Pilot regulator
    Patent number: 4219017
    Abstract: An improved regulator intended primarily for use as the essential component of a SCUBA system and being a single hose, two stage regulator incorporating a novel valve subassembly in the second stage in the form of a unique main diaphragm valve and a pilot valve assembly.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: August 26, 1980
    Inventors: Ralph B. Shamlian, John D. Burr