Pushbutton keyboard system and method of making same

Details Pushbutton keyboard system and method of making same Pushbutton keyboard system and method of making same

1975-01-10

1976-12-07

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, H01H 1352

Patent

active

039964272

ABSTRACT:
A keyboard system for an electronic pocket calculator or the like comprises a substrate board having a generally flat surface with a network of circuit paths thereon. The board is provided with switch contacts at a plurality of switching stations and terminals at a margin of the board for electrical interconnection to other electronic components. Conductor paths and the network of circuit paths interconnect the contacts and the terminals. A dielectric layer is disposed on the substrate leaving portions of the network of circuit paths exposed.

REFERENCES:
patent: 2262777 (1941-11-01), Roper
patent: 3684842 (1972-08-01), Boulanger
patent: 3749859 (1973-07-01), Webb et al.
patent: 3796843 (1974-03-01), Durkee et al.
patent: 3886335 (1975-05-01), Hendricks

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