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US4311996: Hand held type electronic calculators


Filing Information

Inventor(s) Tadashi Nakamura · Kentaro Kiyozumi ·
Assignee(s) Ise Electronics Corporation ·
Attorney/Agent(s) Charles E. Pfund ·
Primary Examiner David L. Trafton ·
Application Number US5661641
Filing date 02/26/1976
Issue date 01/19/1982
Predicted expiration date 01/19/1999
U.S. Classifications 340/711  · 174/50  ·
International Classifications G08B 536  ·
Kind CodeA
International Classifications 340337;365 R;711;718;719 ·
Related U.S. Application DataRELATED APPLICATION
This application is a continuation-in-part of Ser. No. 386,772 filed Aug. 8, 1973, now abandoned.
Foreign Priority JP4793856 - 08/10/1972 ·
5 Claims, No Drawings


In a hand held type electronic calculator wherein a display section and a key board are mounted on the surface of an insulative substrate, a driving circuit for driving the display section and an operation circuit operated by the key board are also mounted on the same surface of the insulative substrate.

Independent Claims | See all claims (5)

  1. 1. A unitary type electronic calculator comprising a multi-digit display section and a key board mounted on one surface of an insulative substrate, a driving circuit for said display section and an operation circuit operated by said key board mounted on said surface of said insulative substrate and printed wire means on only said one surface of said substrate for operatively interconnecting the elements mounted on said surface to operate as a calculator having a physical thickness no greater than the combined thickness of said substrate and the thickest one of said elements.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3193132 Gray Jul 1965
US3751137 ROCKWELL INTERNATIONAL CORP Fitzgibbons et al. Aug 1973
US3858202 TEXAS INSTRUMENTS INC Boulanger Dec 1974
US3950603 Analog Devices, Incorporated Brefka Apr 1976
US4181964 Texas Instruments Incorporated Moore et al. Jan 1980

Patent Family