Electronic pressure sensitive transducer apparatus
Patent 4314227 Issued on February 2, 1982. Estimated Expiration Date: 
September 24, 1999. 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.
September 24, 1999. 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 2042606 3503031 3699294 3806471 3898421 Membrane switch apparatus having sequential bridging contact arrangement Keyboard membrane switch having threshold force structure Keyboard switch assembly having adhesive position retainer element Membrane switch apparatus Keyboard switch assembly having internal gas passages preformed in spacer member InventorApplicationNo. 06/078323 filed on 09/24/1979US Classes:338/99, Surfaces pressed together (e.g., compressible type)338/100, Granular338/114, Deformable338/69Musical instrument playing key actuatedExaminersPrimary: Albritton, C. L.Attorney, Agent or FirmInternational ClassesG01L 1/20 (20060101)G01L 1/20 (20060101) B60C 23/04 (20060101) B60C 23/04 (20060101) B60C 23/02 (20060101) B60C 23/02 (20060101) H01H 13/702 (20060101) H01H 13/702 (20060101) H01H 13/70 (20060101) H01H 13/70 (20060101) H01H 1/02 (20060101) H01H 1/02 (20060101) H01H 1/029 (20060101) H01H 1/029 (20060101) H01C 10/10 (20060101) H01C 10/10 (20060101) H01C 10/00 (20060101) H01C 10/00 (20060101) AbstractA pressure responsive, variable resistance, analog switch has first and second conductors interleaved in spaced-apart relationship and disposed on a base member. An insulative spacer ring is positioned around and rises above the first and second conductors. A resilient cover sheet is attached to the top of the insulative spacer ring in spaced relationship over the conductors to define an enclosure between the resilient cover sheet and the base member. A pressure sensitive resistive conductor composition is disposed on the resilient cover sheet or on the conductors in the enclosure to interconnect a resistance between the first and second conductors when the resilient cover sheet is depressed against the conductors. The amount of resistance so interconnected varies inversely to the amount of pressure exerted.Other References
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