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US Patent 4797661 - Motion sensing device
US Patent Issued on January 10, 1989
Estimated Patent Expiration Date:
August 31, 2007Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
August 31, 2007Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.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.Other References
| InventorAssigneeApplicationNo. 07/091447 filed on 08/31/1987US 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 indicatorField of Search340/689, Tilt340/669, Acceleration340/664CurrentExaminersPrimary: Swann, III, Glen R.Assistant: Mullen, Thomas J. Jr. Attorney, Agent or FirmUS Patent References4028815, Temperature compensated toroidal accelerometerIssued on: 06/14/1977 Inventor: Buckley , et al.4359717, Position-sensitive alarm system Issued on: 11/16/1982 Inventor: Huber , et al.4378693, Deflection measuring system Issued on: 04/05/1983 Inventor: Ratcliffe4390759, Tilt-sensitive ignition switch Issued on: 06/28/1983 Inventor: Scieur4465074, Method of applying an electrode to the skin of a patient Issued on: 08/14/1984 Inventor: Buchalter4468864, Tilt meter Issued on: 09/04/1984 Inventor: Westphal , et al.4536755, Apparatus for detecting unauthorized egress by patient from position of confinement Issued on: 08/20/1985 Inventor: Holzgang , et al.4654977, Electronic level Issued on: 04/07/1987 Inventor: Pakus4667188, Portable alarm Issued on: 05/19/1987 Inventor: Schwartz4710757Planter monitor system Issued on: 12/01/1987 Inventor: Haase International ClassesG08B 21/00 (20060101)G08B 21/04 (20060101) G08B 13/02 (20060101) G08B 13/14 (20060101) |
