US3588484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error detecting system of adder
Assignee: Hitachi Ltd
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Filing: 1968-09-18
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Granted: 1971-06-28
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Expires: 1988-09-18
Abstract
Abstract A CARRY OF THE LOWER FIGURE OF TWO ADJACENT NUMERICAL FIGURES OF AN ADDR IS FED TO A SECOND CARRY CIRCUIT WITH AN AUGEND AND AN ADDEND OF THE UPPER FIGURE AND A SECOND CARRY IS PRODUCED THEREBY. THE SECOND CARRY IS COMPARED TO A FIRST CARRY OF THE UPPER FINGER DERIVED FROM A CARRY LOOK AHEAD CIRCUIT WITH THE RESULT THAT AN ERROR CHECK SIGNAL IS GENERATED WHEN FIRST AND SECOND CARRIES DO NOT AGREE WITH EACH OTHER.
Inventors
- 👤 Tetsunori Nishimoto
- 👤 Kisaburo Nakazawa
- 👤 Koichiro Ishihara
- 👤 Hisashi Horikoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:50
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/1608
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |