US3924112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic calculator
Assignee: Casio Computer Co Ltd
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Filing: 1974-07-29
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Granted: 1975-12-02
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Expires: 1994-07-29
Abstract
Abstract Digits of numerical information, i.e. the calculation results obtained by an arithmetic operation device, are stored successively into a memory device. At the completion of the arithmetic operation, the most or least significant digit of the numerical information is shifted to the least significant digit position of the memory device. When required, the digits are successively read out from the least significant digit position in response to shift instruction signals supplied to the memory device, and then displayed successively at an indicating device, one at a time. An indication-stop signal is generated upon completion of the read out operation of the numerical information, instructing the indicating device to cease its onedigit indication.
Inventors
- 👤 Toshio Kashio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:42
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
283 words
An electronic calculator having input means for supplying numerical input information and function instruction, arithmetic operation means for effecting an arithmetic operation on the numerical input information in response to the function instruction, and register means coupled between said input means and said arithmetic operation means and adapted to store the numerical input information and the results of the arithmetic operation, the electronic calculator further including: indicating means coupled to said register means and adapted to display one of digits of the numerical input information stored in said register means; first control means coupled to said register means for feeding to said indicating means one of the numerical input information stored in said register means; second control means coupled to said register means for starting the shift of the numerical input information in said register means when said arithmetic operation means finishes an arithmetic operation, for detecting the arrival of a terminal digit of the numerical input information at a feed-out position of said register means from which the digits of the numerical input information are to be fed successively to said indicating means, and for stopping the shift of the numerical input information when said detection is made; third control means coupled to said register means for reading out the numerical input information digit by digit from said register means after the terminal digit of the numerical input information reaches said feed-out position of the register means and for shifting succeeding numerical input information digit by digit to said feed-out position of said register means; and detecting means for detecting the display of the terminal significant digit of said numerical information, to thereby ascertain that all the digits thereof have been displayed.
Claim 2
Dependent Claim
283 words
An electronic calculator having input means for supplying numerical input information and function instruction, arithmetic operation means for effecting an arithmetic operation on the numerical input information in response to the function instruction, and register means coupled between said input means and said arithmetic operation means and adapted to store the numerical input information and the results of the arithmetic operation, the electronic calculator further including: indicating means coupled to said register means and adapted to display one of digits of the numerical input information stored in said register means; first control means coupled to said register means for feeding to said indicating means one of the numerical input information stored in said register means; second control means coupled to said register means for starting the shift of the numerical input information in said register means when said arithmetic operation means finishes an arithmetic operation, for detecting the arrival of a terminal digit of the numerical input information at a feed-out position of said register means from which the digits of the numerical input information are to be fed successively to said indicating means, and for stopping the shift of the numerical input information when said detection is made; third control means coupled to said register means for reading out the numerical input information digit by digit from said register means after the terminal digit of the numerical input information reaches said feed-out position of the register means and for shifting succeeding numerical input information digit by digit to said feed-out position of said register means; and detecting means for detecting the display of the terminal significant digit of said numerical information, to thereby ascertain that all the digits thereof have been displayed.
Claim 3
Dependent Claim
35 words
An electronic calculator according to claim 1 wherein said register means comprises a register (13) to store numerical input information from said input means and the results of arithmetic operation from said arithmetic operation means.
Claim 4
Dependent Claim
43 words
An electronic calculator according to claim 1 wherein said register means comprises a first register (13) to store the numerical input information from said input means; and a second register (15) to store the results of arithmetic operation from said arithmetic operation means.
Claim 5
Dependent Claim
93 words
An electronic calculator according to claim 1 wherein said first control means comprises a timing pulse generating means (18) to generate a timing pulse cyclically in synchronism with the read out timing of one digit of the numerical input information from said register means; and gate means (16) coupled to receive as gate inputs an output pulse from said timing pulse generating means (18) and an output signal from said register means (13) and then to supply to said indicating means one digit of the numerical input information from said register means (13).
Claim 6
Dependent Claim
70 words
An electronic calculator according to claim 1 wherein said second control means includes means for detecting the arrival of the most significant digit of the numerical input information stored in said register means at said feed-out position of the register means from which the digits of the numerical input information are to be fed successively to said indicating means, and for then stopping the shifting of said numerical input information.
Claim 7
Dependent Claim
70 words
An electronic calculator according to claim 1 wherein said second control means includes means for detecting the arrival of the least significant digit of the numerical input information stored in said register means at said feed-out position of the register means from which the digits of the numerical input information are to be fed successively to said indicating means, and for then stopping the shifting of said numerical input information.
Claim 8
Dependent Claim
99 words
An electronic calculator according to claim 1 wherein said second control means comprises a number detection means (28) to detect that a terminal digit of the numerical input information is fed to said indicating means by said first control means from said register means; and inverter means (29) connected to the output terminal of said number detection means (28) and coupled to intercept a shift instruction signal to said arithmetic operation means when said number detection means (28) effects said detection, thereby intercepting a shift instruction signal with respect to the numerical input information stored in said register means.
Claim 9
Dependent Claim
33 words
An electronic calculator according to claim 7 wherein the numerical information to be fed from said register means to said indicating means is a numerical value indicating the results of an arithmetic operation.
Claim 10
Dependent Claim
67 words
An electronic calculator according to claim 1 wherein said third control means comprises memory means (20) for storing an end-signal denoting completion of the arithmetic operation; and a logic circuit coupled to said memory means (20) to supply an output signal indicating the storing of the end-signal in said memory means (20), said output signal being fed to said arithmetic operation means as a shift instruction signal.
Claim 11
Dependent Claim
35 words
An electronic calculator according to claim 9 wherein said logic circuit includes a gate control input responsive to a function instruction (16) from said input means (11) for controlling the output of said logic circuit.
Claim 12
Dependent Claim
35 words
An electronic calcUlator according to claim 9, comprising a timer, and wherein said logic circuit includes a gate input responsive to a pulse signal from said timer for controlling the output of said logic circuit.
Claim 13
Dependent Claim
75 words
An electronic calculator according to claim 1 wherein said detecting means includes counter means (23) coupled to said second and third control means for counting the output signals from said second and third control means which are supplied to said arithmetic operation means as control signals, and for producing a carry signal to indicate the display of the final significant digit, thereby ascertaining that all the digits of the numerical input information have been displayed.
Claim 14
Dependent Claim
37 words
An electronic calculator according to claim 1 wherein said indicating means further includes a special display pattern which indicates the completion of the display of all the digits constituting the numerical input information from said register means.
References Cited (Backward Citations)
US3848250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |