Patents by Inventor Murray Hefter

Murray Hefter 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).

  • Variable reluctance stepper motor
    Patent number: 4048531
    Abstract: A variable reluctance stepper motor includes an energizable first stator cooperative with a first rotor for imparting incremental motion to the rotor and a second stator generating a permanent magnetic field and a second rotor cooperative therewith to restrain the rotor from drift rotation upon deenergization of the first stator. The second stator-second rotor combination defines positions of minimum magnetic reluctance radially angularly coincident with those provided by the first stator-first rotor combination. A lead screw is displaced rectilinearly to provide a linear output according with rotor shaft rotation.
    Type: Grant
    Filed: June 5, 1974
    Date of Patent: September 13, 1977
    Assignee: The Singer Company
    Inventors: Kenneth G. Buess, Murray Hefter