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US 3819921

How Texas Instruments Invented the Handheld Electronic Calculator

This 1972 patent describes the architecture for the first truly portable, battery-powered electronic calculator that could fit in a pocket.

Statusexpired

Granted1974

Expires1992

Claims74

Forward citations18

Prior art10

AssigneeTexas Instruments Inc

InventorsJ Kilby, J Merryman +1

Patent B

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