Patents by Inventor Carlos E. Wheeler

Carlos E. Wheeler 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).

  • Soil moisture indicator device
    Patent number: 4020417
    Abstract: A soil moisture indicator device for plants comprises an electrical circuit which includes an unbalanced resistive bridge having the common junctions of the resistors on its opposite sides connected to control the switching of a pair of indicator lights. Current drawn through the resistance of the soil as sensed by a probe is used to adjust the output voltages on the sides of the unbalanced resistive bridge to switch on one of the indicator lights if the soil has at least an adequate moisture content and to switch on the other of the indicator lights if the soil has an excessive moisture content.
    Type: Grant
    Filed: November 26, 1975
    Date of Patent: April 26, 1977
    Assignee: Turf Service Laboratories, Inc.
    Inventors: Alfred W. Brehob, Carlos E. Wheeler