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Planter monitor system Patent #: 4710757
ApplicationNo. 07/091447 filed on 08/31/1987
US Classes:340/664, Current33/366.21, Having resistive or contact circuit control element340/669, Acceleration340/689, Tilt73/500, Liquid surface is or moves reading means73/514.09, Fluid or fluent inertial mass73/654With electrically controlled indicator
ExaminersPrimary: Swann, III, Glen R.
Assistant: Mullen, Thomas J. Jr.
Attorney, Agent or Firm
International ClassesG08B 21/00 (20060101)
G08B 21/04 (20060101)
G08B 13/02 (20060101)
G08B 13/14 (20060101)
AbstractThis invention relates to a device adapted to sensing motion when powered by passage of an electric current between two electrodes that is comprised of a container partially filled with an electrically conductive liquid along with two electrodes in contact with the conductive liquid at least one of which is only partially in contact with said conductive liquid. Motion of the liquid causes a change in resistance between the electrodes which may be detected as a change in current flow. These changes in current flow can be amplified and used to activate an alarm or other signal device.