Patents by Inventor John Merrison

John Merrison 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 and apparatus used with AC motor for detecting unbalance
    Patent number: 5543698
    Abstract: A method and apparatus used with a motor controller that detects load imbalance at a relatively low speed and, if the degree of load imbalance is greater than a predetermined acceptable maximum degree, produces an alarm signal that indicates an imbalanced load. If the degree of load imbalance is greater than the predetermined acceptable maximum value, the present invention may either attempt to rebalance the load or stops the motor until the balance can be manually adjusted.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: August 6, 1996
    Assignee: Allen-Bradley Company, Inc.
    Inventors: Jinghan Tao, John Merrison