Patents by Inventor Robert N. Christensen

Robert N. Christensen 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).

  • Air cannon
    Patent number: 6644294
    Abstract: A golf ball projecting air cannon capable of propelling a golf ball or similar projectile with high pressure to reach distances beyond 100 yards. The device employs an electronic circuit providing safety, firing, and reloading controls. The timer and motor provide for the timed activation of a series of microswitches and solenoids to distribute air to various ports at a designated position within the device to force appropriate movements.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: November 11, 2003
    Inventor: Robert N. Christensen
  • Air cannon
    Publication number: 20030089361
    Abstract: A golf ball projecting air cannon capable of propelling a golf ball or similar projectile with high pressure to reach distances beyond 100 yards. The device employs an electronic circuit providing safety, firing, and reloading controls. The timer and motor provide for the timed activation of a series of microswitches and solenoids to distribute air to various ports at a designated position within the device to force appropriate movements.
    Type: Application
    Filed: November 9, 2001
    Publication date: May 15, 2003
    Inventor: Robert N. Christensen