US3444516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error correcting communication system
Assignee: AT&T Inc
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Filing: 1966-08-25
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Granted: 1969-05-13
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Expires: 1986-08-25
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Lechleider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:50
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN COMBINATION, A SOURCE OF A LEAST A FIRST AND A SECOND MESSAGE SIGNAL, MEANS FOR COMBINING SAID FIRST AND SECOND MESSAGE SIGNALS IN AT LEAST FOUR DIFFERENT WAYS TO FORM AT LEAST FOUR COMBINATION SIGNALS, AT LEAST FOUR DIVERSE TRANSMISSION CHANNELS EACH OF COMMUNICATING ONE OF SAID COMBINATION SIGNALS TO A RECEIVING TERMINAL, MEANS AT SAID RECEIVING TERMINAL RESPONSIVE TO SAID COMBINATION SIGNALS FOR FORMING A PLURALITY OF RECOVERED FIRST AND SECOND MESSAGE SIGNALS, EACH OF SAID RECOVERED FIRST AND SECOND MESSAGE SIGNALS BEING DERIVED FROM A DIFFERENT SET OF COMBINATION SIGNALS, MEANS FOR COMPARING LIKE RECOVERED MESSAGE SIGNALS TO DETECT AN ERRONEOUS COMBINATION SIGNAL, AND MEANS FOR ELIMINATING ANY RECOVERED MESSAGE SIGNAL WHICH IS DERIVED IN PART FROM SAID ERRONEOUS COMBINATION SIGNAL.
Claim 2
Dependent Claim
124 words
IN COMBINATION, A SOURCE OF A LEAST A FIRST AND A SECOND MESSAGE SIGNAL, MEANS FOR COMBINING SAID FIRST AND SECOND MESSAGE SIGNALS IN AT LEAST FOUR DIFFERENT WAYS TO FORM AT LEAST FOUR COMBINATION SIGNALS, AT LEAST FOUR DIVERSE TRANSMISSION CHANNELS EACH OF COMMUNICATING ONE OF SAID COMBINATION SIGNALS TO A RECEIVING TERMINAL, MEANS AT SAID RECEIVING TERMINAL RESPONSIVE TO SAID COMBINATION SIGNALS FOR FORMING A PLURALITY OF RECOVERED FIRST AND SECOND MESSAGE SIGNALS, EACH OF SAID RECOVERED FIRST AND SECOND MESSAGE SIGNALS BEING DERIVED FROM A DIFFERENT SET OF COMBINATION SIGNALS, MEANS FOR COMPARING LIKE RECOVERED MESSAGE SIGNALS TO DETECT AN ERRONEOUS COMBINATION SIGNAL, AND MEANS FOR ELIMINATING ANY RECOVERED MESSAGE SIGNAL WHICH IS DERIVED IN PART FROM SAID ERRONEOUS COMBINATION SIGNAL.
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) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |