Patents by Inventor Joshua Premack

Joshua Premack 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: 5034722
    Abstract: A capacitance sensing security system in which comparison/reference and sensing oscillator are coupled together to operate in substantial frequency synchronism, each of the oscillators includes an amplifier having input and output terminals and a feedback circuit including a capacitor connected to the input terminals, the feedback circuit connected to the sensing oscillator exhibiting a low capacitive reactance, the input terminals of the sensing oscillator being connected to one or more objects to be secured so that extraneous transient signals appearing at or on the objects do not affect the phase/frequency of the sensing oscillator, the resistive component being substantially greater than the resistance of the input terminals and is provided either by adjusting the value of the capacitive component in the feedback circuit and/or disposing a resistor in series therewith.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: July 23, 1991
    Inventor: Joshua Premack