US3074640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Full adder and subtractor using nor logic
Assignee: International Business Machines Corp
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Filing: 1960-12-19
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Granted: 1963-01-22
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Expires: 1980-12-19
Abstract
No abstract record available.
Inventors
- 👤 Gerald A Maley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:30
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/50; G06F7/501; G06F7/502; H; H03; H03K; H03K19/00; H03K19/20; H03K19/21; H03K19/212
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
252 words
A FULL ADDER CIRCUIT CAPABLE OF OPERATING UPON THREE BINARY SIGNALS COMPRISING: A FIRST AND SECOND GROUP OF NOR CIRCUITS, EACH GROUP CONTAINING A FIRST, A SECOND, A THIRD AND A FOURTH NOR CIRCUIT, EACH HAVING AT LEAST TWO INPUT AND AN OUTPUT TERMINAL, AND CIRCUIT MEANS CONNECTING THE OUTPUT OF SAID FIRST NOR CIRCUIT TO THE INPUTS OF SAID SECOND AND THIRD NOR CIRCUITS, THE OUTPUT OF SAID SECOND AND THIRD NOR CIRCUITS TO THE INPUT OF SAID FOURTH NOR CIRCUIT, ONE INPUT OF SAID FIRST NOR CIRCUIT TO THE INPUT OF SAID SECOND NOR CIRCUIT AND THE OTHER INPUT OF SAID FIRST NOR CIRCUIT TO THE INPUT OF SAID THIRD NOR CIRCUIT; CIRCUIT MEANS CONNECTING TWO OF SAID THREE BINARY SIGNALS TO THE INPUTS OF THE FIRST NOR CIRCUIT IN SAID FIRST GROUP, THE REMAINING BINARY SIGNAL TO THE INPUT OF THE FIRST NOR CIRCUIT IN SAID SECOND GROUP, AND THE OUTPUT OF SAID FOURTH NOR CIRCUIT IN SAID FIRST GROUP TO THE INPUT OF SAID FIRST NOR CIRCUIT IN SAID SECOND GROUP; A CARRY NOR CIRCUIT HAVING AT LEAST TWO INPUT TERMINALS AND AN OUTPUT TERMINAL; AND CIRCUIT MEANS CONNECTING THE OUTPUTS OF THE FIRST NOR CIRCUITS IN SAID FIRST AND SECOND GROUPS TO THE INPUTS OF SAID CARRY NOR CIRCUIT, WHEREBY THE OUTPUT FROM SAID FOURTH NOR CIRCUIT IN SAID SECOND GROUP REPRESENTS THE SUM FUNCTION OF SAID THREE BINARY SIGNALS AND THE OUTPUT OF SAID CARRY NOR CIRCUIT REPRESENTS THE CARRY FUNCTION OF SAID THREE BINARY SIGNALS.
Claim 2
Dependent Claim
252 words
A FULL ADDER CIRCUIT CAPABLE OF OPERATING UPON THREE BINARY SIGNALS COMPRISING: A FIRST AND SECOND GROUP OF NOR CIRCUITS, EACH GROUP CONTAINING A FIRST, A SECOND, A THIRD AND A FOURTH NOR CIRCUIT, EACH HAVING AT LEAST TWO INPUT AND AN OUTPUT TERMINAL, AND CIRCUIT MEANS CONNECTING THE OUTPUT OF SAID FIRST NOR CIRCUIT TO THE INPUTS OF SAID SECOND AND THIRD NOR CIRCUITS, THE OUTPUT OF SAID SECOND AND THIRD NOR CIRCUITS TO THE INPUT OF SAID FOURTH NOR CIRCUIT, ONE INPUT OF SAID FIRST NOR CIRCUIT TO THE INPUT OF SAID SECOND NOR CIRCUIT AND THE OTHER INPUT OF SAID FIRST NOR CIRCUIT TO THE INPUT OF SAID THIRD NOR CIRCUIT; CIRCUIT MEANS CONNECTING TWO OF SAID THREE BINARY SIGNALS TO THE INPUTS OF THE FIRST NOR CIRCUIT IN SAID FIRST GROUP, THE REMAINING BINARY SIGNAL TO THE INPUT OF THE FIRST NOR CIRCUIT IN SAID SECOND GROUP, AND THE OUTPUT OF SAID FOURTH NOR CIRCUIT IN SAID FIRST GROUP TO THE INPUT OF SAID FIRST NOR CIRCUIT IN SAID SECOND GROUP; A CARRY NOR CIRCUIT HAVING AT LEAST TWO INPUT TERMINALS AND AN OUTPUT TERMINAL; AND CIRCUIT MEANS CONNECTING THE OUTPUTS OF THE FIRST NOR CIRCUITS IN SAID FIRST AND SECOND GROUPS TO THE INPUTS OF SAID CARRY NOR CIRCUIT, WHEREBY THE OUTPUT FROM SAID FOURTH NOR CIRCUIT IN SAID SECOND GROUP REPRESENTS THE SUM FUNCTION OF SAID THREE BINARY SIGNALS AND THE OUTPUT OF SAID CARRY NOR CIRCUIT REPRESENTS THE CARRY FUNCTION OF SAID THREE BINARY SIGNALS.
References Cited (Backward Citations)
US2899133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |