Patents by Inventor John Rothwell

John Rothwell 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).

  • Method of shutting down a rotor spinning machine
    Patent number: 4777791
    Abstract: The invention provides for the spinning units of a multi-position rotor spinning machine to be driven by a common AC drive motor powered by a static inverter enabling the power supply frequency to the AC motor to be controlled for controlling the rate of acceleration and the operating speed and the rate of deceleration of the AC drive motor. This facilitates a method of mass stopping.
    Type: Grant
    Filed: December 2, 1987
    Date of Patent: October 18, 1988
    Assignee: Hollingsworth U.K. Ltd.
    Inventors: Alfred Wood, John Rothwell
  • Method of starting and shutting down a friction spinning machine
    Patent number: 4774805
    Abstract: The invention provides for the spinning units of a multi-position open-end spinning machine to be driven by a common AC drive motor powered by a static inverter enabling the power supply frequency to the AC motor to be controlled for controlling the rate of acceleration and the operating speed and the rate of deceleration of the AC drive motor. This facilitates a method of mass start-up and mass stopping of a friction spinning machine are disclosed.
    Type: Grant
    Filed: December 2, 1987
    Date of Patent: October 4, 1988
    Assignee: Hollingsworth U.K. Ltd.
    Inventors: Alfred Wood, John Rothwell