Patent US3260840A successfully refreshed from Google Patents.
US3260840A
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Variable mode arithmetic circuits with carry select
Assignee: International Business Machines Corp
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Filing: 1961-12-28
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Granted: 1966-07-12
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Expires: 1981-12-28
Abstract
No abstract record available.
Inventors
- 👤 Lewis E King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:18
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/483; G06F7/50; G06F7/505; G06F7/506; G06F7/508; G06F7/57; G06F7/575; G06F2207/00; G06F2207/38; G06F2207/3804; G06F2207/3808; G06F2207/3812; G06F2207/3816; G06F2207/386
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
AN ARITHMETIC CIRCUIT COMPRISING: CYCLICALLY OPERATING ADDER MEANS HAVING A PREDETERMINED NUMBER OF POSITIONS, EACH POSITON HAVING MEANS FOR PROVIDING A CARRY OUT; MEANS FOR SUPPLYING PAIRS OF OPERANDS TO SAID ADDER DURING SUCCESSIVE CYCLES, SAID OPERANDS BEING REPSENTED IN A PLURALITY OF RADICES; MEANS FOR DETERMINING THE RADIX OF EACH SAID PAIR OF OPERANDS; MODE CONTROL MEANS FOR ESTABLISHING GATING AND CONTROL SIGNALS ACCORDING TO THE RADICES OF SAID OPERANDS; INDIVIDUAL CARRY SELECT MEANS RESPECTIVELY ASSOCIATED WITH SAID ADDER, AND RESPECTIVELY OPERABLE DURING PARTICULAR ONES OF SAID MODES;
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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |