Patent US3121197A successfully refreshed from Google Patents.
US3121197A
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Voice-frequency binary data transmission system with return signal
Assignee: AT&T Inc
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Filing: 1960-03-08
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Granted: 1964-02-11
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Expires: 1980-03-08
Abstract
No abstract record available.
Inventors
- 👤 Edwin A Irland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:18
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
AN INFORMATION TRANSFER SYSTEM COMPRISING A TELEPHONE LINE TRANSMISSION PATH, A PLURALITY OF LEADS PRESENTING RESPECTIVE INFORMATION SIGNALS TO BE TRANSFERRED OVER SAID PATH, MEANS FOR GENERATING DISTINCT SYNCHRONOUS SINE WAVE SIGNALS FOR APPLICATION TO SAID PATH IN CORRESPONDENCE WITH SAID INFORMATION SIGNALS, SAID DISTINCT SINE WAVE SIGNALS BEARING A HARMONIC RELATION TO EACH OTHER, MEANS FOR PRODUCING SQUARE-WAVE PULSES FROM ONE OF SAID SINE WAVE SIGNALS, MEANS UNDER THE CONTROL OF
Claim 2
Dependent Claim
72 words
AN INFORMATION TRANSFER SYSTEM COMPRISING A TELEPHONE LINE TRANSMISSION PATH, A PLURALITY OF LEADS PRESENTING RESPECTIVE INFORMATION SIGNALS TO BE TRANSFERRED OVER SAID PATH, MEANS FOR GENERATING DISTINCT SYNCHRONOUS SINE WAVE SIGNALS FOR APPLICATION TO SAID PATH IN CORRESPONDENCE WITH SAID INFORMATION SIGNALS, SAID DISTINCT SINE WAVE SIGNALS BEARING A HARMONIC RELATION TO EACH OTHER, MEANS FOR PRODUCING SQUARE-WAVE PULSES FROM ONE OF SAID SINE WAVE SIGNALS, MEANS UNDER THE CONTROL OF
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |