Patents by Inventor Jonathan Kramer

Jonathan Kramer 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).

  • Admittance measuring system for monitoring the condition of materials
    Patent number: 4146834
    Abstract: A two-wire transmitter includes an admittance sensing probe adapted to sense the conditions and corresponding admittance of materials. The probe is coupled into an admittance responsive network which generates an admittance signal representing the condition of materials. The output current from the transmitter is varied in response to the admittance signal. In one embodiment of the invention, the admittance responsive network comprises a variable frequency oscillator whose frequency varies with the admittance of the materials. In another embodiment, the admittance responsive network comprises a ramp generator with a frequency which varies with the admittance of the materials. In another embodiment, the admittance responsive network comprises a bridge whose balance changes in response to the admittance of the materials.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: March 27, 1979
    Assignee: Drexelbrook Controls, Inc.
    Inventors: Frederick L. Maltby, Jonathan Kramer, Kenneth M. Loewenstern