US3118019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone signaling circuit
Assignee: AT&T Inc
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Filing: 1960-08-23
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Granted: 1964-01-14
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Expires: 1980-08-23
Abstract
No abstract record available.
Inventors
- 👤 Herbert S Feder
- 👤 Jr George B Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:55
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/12; H04J3/20; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
IN A COMMUNICATION SYSTEM, A FIRST LINE COMPRISING FIRST FILTER MEANS HAVING A CUT-OFF FREQUENCY FC, A SECOND LINE COMPRISING SECOND FILTER MEANS HAVING A CUT-OFF FREQUENCY FT DISTINCT FROM FC, MEANS FOR CONNECTING SAID FIRST LINE TO SAID SECOND LINE IN A PARTICULAR TIME SLOT RECURRING CYCLICALLY AT A FREQUENCY SUBSTANTIALLY EQUAL TO FC+FT, FIRST SIGNALING MEANS, SECOND SIGNALING MEANS, AND MEANS FOR CONNECTING SAID FIRST SIGNALING MEANS TO SAID FIRST LINE AND FOR CONNECTING SAID SECOND SIGNALING MEANS TO SAID SECOND LINE DURING SAID PARTICULAR TIME SLOT IN RESPECTIVE ALTERNATE CYCLES.
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) | 1967-01-13 | 1967-07-15 | 1968-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-13 | 1971-07-15 | 1972-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-13 | 1975-07-15 | 1976-01-14 | $7700.00 | Window Closed / Lapsed |