Patents by Inventor Himatlal K. Tanna

Himatlal K. Tanna 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).

  • Active noise control system
    Patent number: 4689821
    Abstract: An active noise control system reduces cabin noise levels for a propeller or propfan aircraft due to the propeller noise signature by making the output from a secondary noise source identical in amplitude but opposite in phase to the propeller noise signature.
    Type: Grant
    Filed: September 23, 1985
    Date of Patent: August 25, 1987
    Assignee: Lockheed Corporation
    Inventors: Mohammed Salikuddin, Himatlal K. Tanna