US3078039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error checking system for a parallel adder
Assignee: International Business Machines Corp
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Filing: 1960-06-27
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Granted: 1963-02-19
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Expires: 1980-06-27
Abstract
No abstract record available.
Inventors
- 👤 Stanley F Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:37
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN A PARALLEL ADDER SYSTEM OF THE CLASS DESCRIBED HAVING TWO SOURCES OF SIGNALS REPRESENTING NUMBERS TO BE ADDED AND ADDING CIRCUITS TO GENERATE SIGNALS REPRESENTING THE SUM OF SAID NUMBERS, SAID ADDING CIRCUITS INCLUDING A CARRY-OVER CIRCUIT TO PRODUCE SIGNALS INDICATIVE OF CARRIES BETWEEN THE DENOMINATIONAL ORDERS OF SAID SUM, THE COMBINATION OF MEANS FOR TESTING SAID SUM SIGNALS AND SAID CARRY SIGNALS TO DETECT THE PRESENCE OF ERRONEOUS SIGNALS THEREIN, SAID MEANS COMPRISING, FOR EACH DENOMINATIONAL ORDER, A CIRCUIT RECEIVING SIGNALS REPRESENTING THE INPUT DIGITS AND THE INTERDENOMINATIONAL CARRY INTO THAT ORDER AND DETERMINING THEREFROM THE CARRY AND SUM SIGNALS WHICH SHOULD BE GENERATED IN SAID DENOMINATIONAL ORDER, MEANS TO COMPARE SAID DETERMINED SIGNALS WITH THE CORRESPONDING ONES GENERATED BY SAID ADDER, AND AN ERROR SIGNALLING DEVICE ACTIVATED WHEN SAID COMPARING MEANS DETECTS A VARIANCE BETWEEN SAID COMPARED SIGNALS.
Claim 2
Dependent Claim
141 words
IN A PARALLEL ADDER SYSTEM OF THE CLASS DESCRIBED HAVING TWO SOURCES OF SIGNALS REPRESENTING NUMBERS TO BE ADDED AND ADDING CIRCUITS TO GENERATE SIGNALS REPRESENTING THE SUM OF SAID NUMBERS, SAID ADDING CIRCUITS INCLUDING A CARRY-OVER CIRCUIT TO PRODUCE SIGNALS INDICATIVE OF CARRIES BETWEEN THE DENOMINATIONAL ORDERS OF SAID SUM, THE COMBINATION OF MEANS FOR TESTING SAID SUM SIGNALS AND SAID CARRY SIGNALS TO DETECT THE PRESENCE OF ERRONEOUS SIGNALS THEREIN, SAID MEANS COMPRISING, FOR EACH DENOMINATIONAL ORDER, A CIRCUIT RECEIVING SIGNALS REPRESENTING THE INPUT DIGITS AND THE INTERDENOMINATIONAL CARRY INTO THAT ORDER AND DETERMINING THEREFROM THE CARRY AND SUM SIGNALS WHICH SHOULD BE GENERATED IN SAID DENOMINATIONAL ORDER, MEANS TO COMPARE SAID DETERMINED SIGNALS WITH THE CORRESPONDING ONES GENERATED BY SAID ADDER, AND AN ERROR SIGNALLING DEVICE ACTIVATED WHEN SAID COMPARING MEANS DETECTS A VARIANCE BETWEEN SAID COMPARED SIGNALS.
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) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |