Patents by Inventor John L. Delwichwe

John L. Delwichwe 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).

  • Flow regulating device
    Patent number: 4632139
    Abstract: A device for the automatic regulation of fluid flows through an aperture for use with immiscible liquids having differing densities, wherein the volume, weight and shape of a floatable plug are selected to provide a negative buoyancy with respect to the less dense liquid and a positive buoyancy with respect to the denser liquid, and with the buoyancy of the plug in the various liquids determining whether the fluids will be permitted to flow through the aperture.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: December 30, 1986
    Inventor: John L. Delwichwe