Patents by Inventor Robert Nettleship, deceased

Robert Nettleship, deceased 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).

  • AFC circuit for direct modulation FM data receivers
    Patent number: 4672636
    Abstract: An FM data receiver of the offset type, in which the local oscillator frequency is located between the two frequency-shift-keyed signalling frequencies. To counter the effects of drift in the local oscillator, a simple AFC system mixes the signalling tone signals with delayed signals to provide a frequency control signal.
    Type: Grant
    Filed: April 30, 1985
    Date of Patent: June 9, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Christopher B. Marshall, John F. Wilson, Robert Nettleship, deceased