Patents by Inventor Harold W. Hasenbeck

Harold W. Hasenbeck 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).

  • Rain detector for irrigation control
    Patent number: 4488568
    Abstract: A rain sensor system for controlling irrigation comprises:(a) a heat diffusion sensor having a tip exposed to the atmosphere and characterized in that relatively higher heat loss created by collection of water adjacent the sensor reduces its electrical resistance, and relatively lower heat loss created by absence of such water collection increases the sensor electrical resistance, and(b) circuitry operatively connected with the sensor for controlling an actuator for an irrigation valve.
    Type: Grant
    Filed: June 14, 1982
    Date of Patent: December 18, 1984
    Inventor: Harold W. Hasenbeck
  • Conduction type soil matric potential sensor
    Patent number: 4216789
    Abstract: A matric potential sensor comprises(a) a housing including a porous wall adapted to be located underground,(b) spaced metal plates carried in the housing to be coupled to a source of electrical current, and(c) granular material located to pass electrical current within the housing and between the plates so that the current flow will vary as a function of the moisture content of the granular material, said content adapted to vary as a function of the matric potential of the soil surrounding the housing in response to moisture transmission through the porous housing into the surrounding soil.Special circuitry adapts the sensor for use with a solenoid type irrigation valve controller.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: August 12, 1980
    Inventor: Harold W. Hasenbeck
  • Conduction type soil matric potential sensor
    Patent number: 4137931
    Abstract: A matric potential sensor comprises(a) a housing including a porous wall adapted to be located underground,(b) spaced electrodes carried in the housing to be coupled to a source of electrical current, and(c) granular material located to pass electrical current within the housing and between the electrodes so that the current flow will vary as a function of the moisture content of the granular material, said content adapted to vary as a function of the matric potential of the soil surrounding the housing in response to moisture transmission through the porous housing into the surrounding soil.Special circuitry adapts the sensor for use with a solenoid type irrigation valve controller.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: February 6, 1979
    Inventor: Harold W. Hasenbeck