US3846626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic desk calculator with verification function
Assignee: Sharp Corp
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Filing: 1972-12-29
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Granted: 1974-11-05
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Expires: 1992-12-29
Abstract
Abstract The present disclosure is directed to electronic desk calculators having an additional function for verifying the results of arithmetic operations. The verification system includes an additional register for storing the results of the previous arithmetic operation and a coincidence circuit for comparing the results of new arithmetic operation with that of the previous operation. The coincidence circuit is responsive to occurrences of operation termination signals, depression of one of function keys for instructing start of the arithmetic operations or a specified switch for instructing verification operations.
Inventors
- 👤 K Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:59
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/14; G06F11/1497
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
A key controlled electronic desk calculator, comprising: manually operated keyboard means having digit keys and function keys with a preselected one of said function keys causing verification of computations; a plurality of registers including a storage register and a verification register for retaining computed computations transferred thereto; means connecting said storage register with said verification register for transferring computed computations from said storage register to said verification register; a decoder connected with said digit keys and said storage register; comparison means; means connecting said storage register and said verification register with said comparison means; program memory means connected with said comparison means and to said register to enable transfer of computed computations between said registers; and means connecting said function keys to said program memory means to control transfer of computed computations between said registers upon a first actuation of said one key and to cause verification between a second computation subsequently computed and stored in said first register with said first computation stored in said verification register upon a second actuation of said one key.
Claim 2
Dependent Claim
176 words
A key controlled electronic desk calculator, comprising: manually operated keyboard means having digit keys and function keys with a preselected one of said function keys causing verification of computations; a plurality of registers including a storage register and a verification register for retaining computed computations transferred thereto; means connecting said storage register with said verification register for transferring computed computations from said storage register to said verification register; a decoder connected with said digit keys and said storage register; comparison means; means connecting said storage register and said verification register with said comparison means; program memory means connected with said comparison means and to said register to enable transfer of computed computations between said registers; and means connecting said function keys to said program memory means to control transfer of computed computations between said registers upon a first actuation of said one key and to cause verification between a second computation subsequently computed and stored in said first register with said first computation stored in said verification register upon a second actuation of said one key.
Claim 3
Dependent Claim
68 words
A key controlled electronic desk calculator in accordance with claim 1, said comparison means including a coincidence detection circuit means for providing a coincidence signal when the said first and second computations are coincident, an indication means, and means connecting said indication means to the output of said coincidence detection circuit, whereby a signal is produced by said indication means when said first and second computations are coincident.
Claim 4
Dependent Claim
67 words
A key controlled electronic desk calculator in accordance with claim 1, said comparison means including a no-coincidence detection circuit for providing a no-coincidence signal when the said first and second computations are different, an indication means, and means connecting said indication means to the output of said no-coincidence detection circuit, whereby a signal is produced by said indication means when said first and second computations are different.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |