Patents by Inventor Forrest F. Freeman

Forrest F. Freeman 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: 5394745
    Abstract: A method and apparatus for gaining access to the fluid pressure in which a sharp pointed elongate tube transpierces the resilient wall of tubing of the vacuum system creating an opening through the wall which is in fluid communication with an in-take port of an internal combustion engine. The elongate tube bore providing passage way for fluid pressure transmittal, the elongate tube diameter being small enough to allow elasticity of the resilient wall to close the pierced opening after the elongate tube is withdrawn from the pierced opening. The elongate tube bore passage way providing means to transmit fluid pressure to a pressure responsive device or the like, and also provides means to inject fluid into the fluid that is in communication with the in-take port of an internal combustion engine.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: March 7, 1995
    Inventor: Forrest F. Freeman
  • Patent number: 4885934
    Abstract: A method and apparatus for determining exhaust backpressure in which a bore is created in the wall of a manifold, pipe, muffler, of the like which is in fluid communication with an exhaust port of an internal combustion engine. A pressure-indicating device of the type having an elongate probe is inserted through the bore in unsealed and unthreaded relation therewith. After reading the backpressure indicated by the device, the probe is withdrawn and a plug is frictionally engaged with the bore thereby sealing against exhaust leakage.
    Type: Grant
    Filed: January 4, 1988
    Date of Patent: December 12, 1989
    Inventor: Forrest F. Freeman