US3678466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic calculator
Assignee: HP Inc
•
Filing: 1970-10-14
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Granted: 1972-07-18
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Expires: 1990-10-14
Abstract
Abstract A programmable electronic calculator having a display register for storing numerical information is provided with an additional register which always contains the current instruction code and program statement number. A control on the keyboard permits the display of either register without disturbing the contents of either register.
Inventors
- 👤 Richard M Spangler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:49
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
127 words
An electronic calculator comprising: a keyboard; memory means for storing a program of statements for the calculator, the memory means including a program counter for determining the program statement to be executed; a first storage register for storing numerical information; a second storage register for storing alpha-numerical information indicating the current program statement to be executed; display means for displaying alpha-numerical data from one of said storage registers; switching means for connecting one of said storage registers to the display means, the switching means being controllable from the keyboard; gating means for connecting the second storage register with the memory means; and sequential logic means connected to and for sequentially activating the memory means, gating means and display means in response to a signal from the keyboard.
Claim 2
Dependent Claim
127 words
An electronic calculator comprising: a keyboard; memory means for storing a program of statements for the calculator, the memory means including a program counter for determining the program statement to be executed; a first storage register for storing numerical information; a second storage register for storing alpha-numerical information indicating the current program statement to be executed; display means for displaying alpha-numerical data from one of said storage registers; switching means for connecting one of said storage registers to the display means, the switching means being controllable from the keyboard; gating means for connecting the second storage register with the memory means; and sequential logic means connected to and for sequentially activating the memory means, gating means and display means in response to a signal from the keyboard.
Claim 3
Dependent Claim
37 words
An electronic calculator as in claim 1 including a third storage register connected to the display means and the gating means and employed for storing alpha-numerical information indicating the program statement immediately preceding the current program statement.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |