Patents by Inventor Frederick James Easthope

Frederick James Easthope 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).

  • Control device
    Patent number: 4046386
    Abstract: Method and apparatus for accurately controlling the position of a first member such as a phonograph stylus relative to a second movable member on which it is carried.
    Type: Grant
    Filed: February 27, 1976
    Date of Patent: September 6, 1977
    Assignee: Strathearn Audio Limited
    Inventors: Alexander Bennett Gosling, Keith Douglas Ridler, Frederick James Easthope, Colin Howard Stanwell-Smith
  • Method and apparatus for indicating angular displacement
    Patent number: 4032158
    Abstract: A tone arm for a record player having a mirror at one end is provided. Opposite the mirror are a light source and two detector elements. When the tone are pivots from a desired angle light from the source is reflected upon the element more than on the other. The mirror is convexly curved so that pivotal motions of the tone arm in one plane will not affect the amount of light reaching the detectors.
    Type: Grant
    Filed: September 3, 1975
    Date of Patent: June 28, 1977
    Assignee: Strathearn Audio Limited
    Inventors: Colin Howard Stanwell-Smith, Dexter Robert Plummer, Frederick James Easthope, Jonathan Humfrey Pope
  • Stroboscopic device
    Patent number: 4024473
    Abstract: An arrangement for use in indicating the speed of rotation of a body including a switch operated by elements which rotate according to the rotation of the body, a frequency generator which has an output signal at a frequency related to the desired speed of rotation of the body and an indicator which is actuated in accordance with the signals from both the switch and the frequency generator.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: May 17, 1977
    Assignee: Strathearn Audio Limited
    Inventors: Gordon Malcom Edge, Keith Douglas Ridler, Frederick James Easthope