Patents by Inventor David Garratt

David Garratt 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).

  • Measuring apparatus
    Patent number: 4080741
    Abstract: With stylus type measuring instruments for the measurement of surface roughness or form an improved method of setting up employs a reference body having a cylindrical or part-cylindrical surface. By probing the curved reference surface a datum point is established. The reference body is then moved by a predetermined amount with respect to this datum and acts as a secondary reference standard.
    Type: Grant
    Filed: August 11, 1975
    Date of Patent: March 28, 1978
    Assignee: The Rank Organisation Limited
    Inventors: Graham John Siddall, David Garratt