Keyboard switch assembly with multiple isolated electrical engagement regions
Patent 4164634 Issued on August 14, 1979. Estimated Expiration Date: 
June 10, 1997. 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.
June 10, 1997. 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 ReferencesInventorAssigneeApplicationNo. 05/805346 filed on 06/10/1977US Classes:200/5A, With independent operators200/275, Particular shape or structure of the contact200/511, Compressible elastomer200/517, Including additional actuator200/86RTreadsExaminersPrimary: Scott, J. R.Attorney, Agent or FirmInternational ClassesH01H 13/70 (20060101)H01H 13/702 (20060101) AbstractA switch assembly includes an array of switches arranged on a substrate having a conductive pattern on a surface thereof defining a plurality of switch contacts. An apertured spacer is disposed adjacent the surface with an aperture being positioned in opposed relationship to each switch contact. A multi-conductive contact material is disposed to provide switch closure when forced through an aperture in the separator into engagement with a switch contact at a large number of separate conductive engagement regions. In one arrangement the multi-conductive contact material is a fine mesh woven wire screen stretched taut adjacent the separator while in another arrangement it is a uniaxially conducting material having a high density of parallel, spaced conductors extending perpendicular to the surface. | |
