Keyboard mask for general-purpose calculator

Details Keyboard mask for general-purpose calculator Keyboard mask for general-purpose calculator

1976-11-30

1978-10-10

Tomsky, Stephen J.

Registers

Keyboards

With total transfer to keyboard or the like

340365R, 235146, 400473, G06C 702, B41J 508

Patent

active

041198395

ABSTRACT:
In order to adapt a general-purpose calculator to specific tasks, the keyboard of that calculator is covered by a mask including a resilient membrane overlain by a rigid panel having cutouts registering with keys whose function is to be preserved. The cutouts receive extension keys glued or otherwise fastened to the membrane, depression of any extension key operating the underlying original key. The functions of the operative keys can be modified, in accordance with the contemplated use, by insertion of a stored-program cassette associated with the particular mask employed.

REFERENCES:
patent: 2625330 (1953-01-01), Buckey et al.
patent: 3158317 (1964-11-01), Alexander
patent: 4030094 (1977-06-01), Anderson

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