04085306 is referenced by 15 patents and cites 10 patents.

A keyboard assembly includes an insulative substrate upon which are carried a plurality of conductive paths. Respective portions of the paths are selectively bridged upon depression of a dome shaped conductive resilient contact element. Each contact element has a single foot disposed along a marginal portion thereof to allow the dome shaped element to be deformed downwardly upon depression at its apex. The foot of each contact element is in physical and electrical contact with selected ones of the conductive paths and the dome shaped element is adapted to simultaneously engage a plurality of such paths upon depression at the apex. An indentation is provided in the substrate immediately beneath the apex of each contact element to better assure simultaneous contact of the plurality of conductive paths immediately beneath the dome shaped contact element.

Title
Keyboard switch assemblies
Application Number
5/804945
Publication Number
4085306
Application Date
June 9, 1977
Publication Date
April 18, 1978
Inventor
Bill D Dunlap
Longmont
CO, US
Agent
Hugh H Drake
Assignee
KB Denver
CO, US
IPC
H01H 13/52
H01H 1/06
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