Force transducer
Patent 4493219 Issued on January 15, 1985. Estimated Expiration Date: 
August 2, 2002. Estimated 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.
August 2, 2002. Estimated 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.Patent References 3093806 3328653 3418850 Membrane keyboard apparatus having common apertured electrode, aperture inserted electrodes and conductive bubble contactors Membrane keyboard apparatus Cursor control Bounceless switch apparatus Joystick operated multiple position switch Capacitive keyswitch Patent #: 4417294 InventorsAssigneeApplicationNo. 06/404266 filed on 08/02/1982US Classes:73/862.05, Applied to guidance means200/6A, Universally pivoted handle338/47, Force-actuated338/99, Surfaces pressed together (e.g., compressible type)341/20BODILY ACTUATED CODE GENERATORExaminersPrimary: Ruehl, Charles A.Attorney, Agent or FirmInternational ClassesG01L 1/14 (20060101)G01L 1/20 (20060101) H01H 13/70 (20060101) H01H 13/702 (20060101) G05G 9/00 (20060101) G05G 9/047 (20060101) AbstractAn energy conversion and transmission device is disclosed which, in its preferred embodiment, has a rigid substrate with a resistive area printed on its top surface, a spacer of non-conductive material with an aperture therethrough positioned in register with the rigid substrate resistive area, and a flexible substrate with a resistive area printed on its bottom surface in register with the aperture and the rigid substrate resistive area so that application of a force to the flexible substrate with an elastomeric actuator will move the flexible substrate resistive area to establish an electrical contact area with the rigid substrate resistive area, which electrical contact area increases and, thus, the resistivity of that area decreases as the applied force increases. Thus, when an electrical potential is applied across the two resistive areas, current flow through the two resistive areas increases as the applied force increases. Capacitive, inductive and other embodiments of the device are also disclosed.Other References
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