Patents by Inventor Robin E. T. Hill

Robin E. T. Hill 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).

  • Adjustable float sinker
    Patent number: 4202128
    Abstract: An adjustable float-sinker comprising a body having a specific gravity of the order of that of water and means for varying the volume of the body without changing its mass.
    Type: Grant
    Filed: February 28, 1978
    Date of Patent: May 13, 1980
    Inventors: Robin E. T. Hill, Alan W. Mann, Ean L. McDonald, John L. Perdrix