US3291973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binary serial adders utilizing nor gates
Assignee: Unisys Corp
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Filing: 1964-09-22
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Granted: 1966-12-13
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Expires: 1984-09-22
Abstract
No abstract record available.
Inventors
- 👤 Robert E Rasche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:42
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/50; G06F7/504
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
221 words
A SERIAL FULL ADDER FOR ADDING A FIRST VARIABLE COMPOSED OF A AND A DIGITS TO A SECOND VARIABLE COMPOSED OF B AND B DIGITS COMPRISING MEANS TO SORT EACH PAIR OF INCOMING DIGITS ACCORDING TO THE BINARY VALUE OF THE CONSTITUENT DIGITS IN THE PAIR; MEANS TO STORE CARRY AND INVERSE CARRY SIGNALS FOR USE IN A SUCCEEDING DIGITAL ADDITION; MEANS TO PRODUCE A FIRST INTERMEDIATE SIGNAL WHEN A LIKE COMBINATION SIGNAL IS PRODUCED BY THE SORTING MEANS AND AN INVERSE CARRY SIGNAL IS BEING STORED IN SAID STORAGE MEANS; MEANS TO PRODUCE A SECOND INTERMEDIATE SIGNAL WHEN AN UNLIKE COMBINATION SIGNAL IS PRODUCED BY THE SORTING MEANS AND A CARRY SIGNAL IS BEING STORED IN SAID STORAGE MEANS; AN OUTPUT NOR GATE CONNECTED TO RECEIVE SAID FIRST AND SECOND INTERMEDIATE SIGNALS; MEANS TO INITIATE STORAGE OF A CARRY SIGNAL IN RESPONSE TO AN AB SIGNAL FROM SAID SORTING MEANS; MEANS TO INITIATE STORAGE OF A CARRY SIGNAL IN RESPONSE TO A SECOND INTERMEDIATE SIGNAL; AN INVERSE CARRY NOR GATE CONNECTED TO RECEIVE AB SIGNALS FROM SAID SORTING MEANS AND SECOND INTERMEDIATE SIGNALS: MEANS TO INITIATE STORAGE OF AN INVERSE CARRY SIGNAL IN RESPONSE TO AN OUTPUT FROM SAID INVERSE CARRY NOR GATE; AND AN OUTPUT TERMINAL ON SAID OUTPUT NOR GATE FOR CONNECTING THE ADDER TO AN EXTERNAL LOAD.
Claim 2
Dependent Claim
221 words
A SERIAL FULL ADDER FOR ADDING A FIRST VARIABLE COMPOSED OF A AND A DIGITS TO A SECOND VARIABLE COMPOSED OF B AND B DIGITS COMPRISING MEANS TO SORT EACH PAIR OF INCOMING DIGITS ACCORDING TO THE BINARY VALUE OF THE CONSTITUENT DIGITS IN THE PAIR; MEANS TO STORE CARRY AND INVERSE CARRY SIGNALS FOR USE IN A SUCCEEDING DIGITAL ADDITION; MEANS TO PRODUCE A FIRST INTERMEDIATE SIGNAL WHEN A LIKE COMBINATION SIGNAL IS PRODUCED BY THE SORTING MEANS AND AN INVERSE CARRY SIGNAL IS BEING STORED IN SAID STORAGE MEANS; MEANS TO PRODUCE A SECOND INTERMEDIATE SIGNAL WHEN AN UNLIKE COMBINATION SIGNAL IS PRODUCED BY THE SORTING MEANS AND A CARRY SIGNAL IS BEING STORED IN SAID STORAGE MEANS; AN OUTPUT NOR GATE CONNECTED TO RECEIVE SAID FIRST AND SECOND INTERMEDIATE SIGNALS; MEANS TO INITIATE STORAGE OF A CARRY SIGNAL IN RESPONSE TO AN AB SIGNAL FROM SAID SORTING MEANS; MEANS TO INITIATE STORAGE OF A CARRY SIGNAL IN RESPONSE TO A SECOND INTERMEDIATE SIGNAL; AN INVERSE CARRY NOR GATE CONNECTED TO RECEIVE AB SIGNALS FROM SAID SORTING MEANS AND SECOND INTERMEDIATE SIGNALS: MEANS TO INITIATE STORAGE OF AN INVERSE CARRY SIGNAL IN RESPONSE TO AN OUTPUT FROM SAID INVERSE CARRY NOR GATE; AND AN OUTPUT TERMINAL ON SAID OUTPUT NOR GATE FOR CONNECTING THE ADDER TO AN EXTERNAL LOAD.
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) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |