Patents by Inventor Fred W. Lishman

Fred W. Lishman 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).

  • Moisture sensitive irrigation control system
    Patent number: 5351437
    Abstract: A moisture sensitive irrigation control system provides automatic watering of potted plants, lawns, crops, etc. The system utilizes a control valve to effect watering of the soil upon automatic detection of a predetermined level of dryness in a control sample of the soil. The system uses a weight-based method of detecting the amount of moisture in the control sample to regulate the automatic release of a predetermined amount of water into the entire soil for rehydration thereof. As the weight of the control sample increases with the volume of water, the valve is automatically closed to terminate the irrigation process.
    Type: Grant
    Filed: May 12, 1992
    Date of Patent: October 4, 1994
    Inventor: Fred W. Lishman
  • Moisture sensitive self-watering planter
    Patent number: 5020261
    Abstract: A moisture sensitive self-watering planter utilizes a control valve to effect watering of the soil in a liner of the planter upon automatic detection of a predetermined level of dryness of the soil. The planter uses a weight-based system of detecting the amount of moisture in the soil to control the automatic release of a predetermined amount of water into the soil for rehydration thereof. As the weight of the soil increases with the volume of water, the valve is automatically closed to terminate the irrigation process.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: June 4, 1991
    Inventor: Fred W. Lishman
  • Candleholder lamp
    Patent number: D352793
    Type: Grant
    Filed: August 3, 1993
    Date of Patent: November 22, 1994
    Inventor: Fred W. Lishman