Patents by Inventor Jeffrey E. Cambell

Jeffrey E. Cambell 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).

  • Electrical sensor for determining the moisture content of soil
    Patent number: 5479104
    Abstract: An improved soil moisture sensor and circuity are described which permit a more compact, simplified, and less expensive integrated unit wherein the essential circuitry of the device is sealed within the sensor head. Determinations of resistance and capacitance are made using a coaxial or other capacitor having spikes or probes which are inserted into the soil or other material.
    Type: Grant
    Filed: September 14, 1993
    Date of Patent: December 26, 1995
    Assignee: Vitel, Inc.
    Inventor: Jeffrey E. Cambell