Patents by Inventor John S. Frodsham

John S. Frodsham 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 for detecting knock in a spark ignition engine
    Patent number: 4584869
    Abstract: Transducers 16 detect local vibration of the engine and the signals therefrom can be compared using coherence or correlation functions in the region of the knock frequency to ascertain if the source of the vibrations is the same, indicating knock, or different, indicating random vibration. Two transducers spaced apart can be used, or one can measure cylinder pressure. Alternatively, one sensor could be used, using two signals delayed with respect to each other in time.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: April 29, 1986
    Assignee: BL Technology Limited
    Inventor: John S. Frodsham