Patents by Inventor John P. Safford

John P. Safford 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).

  • Patent number: 5268657
    Abstract: A high performance oscillator with low frequency pulling at turn on includes an oscillator transistor, a resonating element and a common base buffer transistor. The resonating element of the oscillator is a circuit having a crystal resonator that is connected in parallel with a transformer winding. This resonating element is connected between the emitter of the oscillator transistor and the emitter of the buffer transistor. More specifically, a tap connects the emitter of the buffer transistor to the transformer winding of the resonating element. With this connection, a low transformed power oscillating output is taken from the collector of the buffer transistor with minimized degradation in the symbol of merit for the crystal oscillator.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: December 7, 1993
    Assignee: Hughes Aircraft Company
    Inventors: Vaughn H. Estrick, John P. Safford