Patents by Inventor Philip Butterworth

Philip Butterworth 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).

  • Assemblies which comprise axially slidable pistons/spools
    Patent number: 4012995
    Abstract: In a piston and cylinder assembly the cylinder comprises at least one annular cylinder block received in a complementary bore of a housing. A means for axially retaining the cylinder block in place relative to the housing includes a pair of slidably engaging part spherical surfaces one of which is carried by a radially displaceable member to adjust for misalignment between the cylinder block and an associated retaining component and to thereby alleviate axially offset pressure which might otherwise be applied to the cylinder block.
    Type: Grant
    Filed: April 30, 1975
    Date of Patent: March 22, 1977
    Assignee: Butterworth Hydraulic Developments Limited
    Inventor: Philip Butterworth