US3143604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission measuring system
Assignee: AT&T Inc
•
Filing: 1961-05-29
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Granted: 1964-08-04
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Expires: 1981-05-29
Abstract
No abstract record available.
Inventors
- 👤 William T Cochran
- 👤 George K Helder
- 👤 James A Mines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:15
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/46
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
107 words
IN COMBINATION, A COMMUNICATION LINE HAVING A FIRST AND A SECOND TERMINUS, MEANS APPLYING TO SAID FIRST TERMINUS AN ELECTRICAL SIGNAL WHICH VARIES IN FREQUENCY WITHIN A PREDETERMINED RANGE AND HAS A DIFFERENT AMPLITUDE AT EACH FREQUENCY, VARIABLE GAIN TRANSLATING MEANS RESPONSIVE TO THE RECEPTION OF SAID SIGNAL AT SAID SECOND TERMINUS FOR TRANSLATING THE RECEIVED SIGNAL AMPLITUDES DIRECTLY INTO INDICATIONS OF WHETHER THE LINE TRANSMISSION GAIN AT EACH SIGNAL FREQUENCY WITHIN SAID RANGE IS EQUAL TO OR OTHER THAN A PRESCRIBED VALUE, AND MEANS FOR VARYING THE GAIN OF SAID TRANSLATING MEANS IN ACCORDANCE WITH THE RESISTANCE OF SAID LINE TO TRANSLATE SAID RECEIVED SIGNAL AMPLITUDES.
References Cited (Backward Citations)
US2735904A
Cited
US1968164A
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US2324215A
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US2666099A
Cited
US2753526A
Cited
US2812492A
Cited
US2857484A
Cited
US2953743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |