Patents Assigned to Plastro-Guat
  • Moisture-responsive valve assembly
    Patent number: 4989628
    Abstract: A moisture-responsive valve assembly includes a housing having a moisture-swellable body to swell in volume in response to soil moisture, and a bi-stable snap-action device for controlling the valve in response to the volume of the moisture-swellable body. The valve assembly further includes a damped delay mechanism effective to close the valve after it has been open for a predetermined period of time.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: February 5, 1991
    Assignees: Plastro-Guat, Asroteam Consultants Ltd., Jacob Gil
    Inventors: Jacob Gil, Zvi Rubinstein, Yoram Hadar