Patents by Inventor James S. Hargreaves

James S. Hargreaves 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).

  • Methods and control systems for registering a datum position between two relatively movable components of a machine tool
    Patent number: 5337147
    Abstract: A method and apparatus for registering a datum position between two components of a machine tool having a path of relative movement, wherein relative movement of the components in path is monitored and a beam of parallel electro-magnetic radiation is directed from a source on one of the components across path of relative movement. A receiver is provided for receiving the beam at one position in relative movement between the components to define a datum position. Electro-magnetic radiation received at receiver location is monitored and used to detect when the radiation received is equivalent to one half of the full beam emitted by the source to define datum position.
    Type: Grant
    Filed: April 12, 1993
    Date of Patent: August 9, 1994
    Inventor: James S. Hargreaves