Plant soil moisture level-signaling device for household and com

Details Plant soil moisture level-signaling device for household and com Plant soil moisture level-signaling device for household and com

1979-04-13

1981-05-19

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

324 65R, 324 65P, 340602, G08B 2100

Patent

active

042688248

ABSTRACT:
A battery-powered device useful in supervising the progressive loss over a time interval of moisture in the soil of a household plant from an initial growth-promoting level to a diminished level at which replenishment is required, wherein the device has a continuously inserted, operative position in the plant soil throughout said time interval of supervision, and yet does not require frequent change of its powering batteries.

REFERENCES:
patent: 3197699 (1965-07-01), Johansen
patent: 3335334 (1967-08-01), Albisser
patent: 3636509 (1972-01-01), Breece et al.
patent: 3644885 (1972-02-01), Radin
patent: 3979667 (1976-09-01), Cornes
patent: 4020417 (1977-04-01), Brehob et al.
patent: 4122389 (1978-10-01), Haagen

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