US3290452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for automatic singing point testing
Assignee: AT&T Inc
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Filing: 1963-10-24
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Granted: 1966-12-06
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Expires: 1983-10-24
Abstract
No abstract record available.
Inventors
- 👤 Nels K Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:42
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/46; H04B3/493
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN COMBINATION, A HYDRID COIL, A BALANCING NETWORK CONNECTED TO SAID HYBRID COIL, A TRANSMISSION LINE AND CONJUGATE TRANSMITTING MEANS AND RECEIVING MEANS ALL CONNECTED TO SAID HYBRID COIL, VARIABLE GAIN AMPLIFICATION MEANS, MEANS FOR CONNECTING SAID AMPLIFICATION MEANS IN A CLOSED LOOP INCLUDING SAID TRANSMITTING MEANS AND SAID RECEIVING MEANS, SAID AMPLIFICATION MEANS INCLUDING MEANS TO MAINTAIN A CONSTANT OUTPUT LEVEL INDEPENDENT OF INPUT LEVEL VARIATION, AND MEANS TO MEASURE THE GAIN OF SAID AMPLIFICATION MEANS.
Claim 2
Dependent Claim
77 words
IN COMBINATION, A HYDRID COIL, A BALANCING NETWORK CONNECTED TO SAID HYBRID COIL, A TRANSMISSION LINE AND CONJUGATE TRANSMITTING MEANS AND RECEIVING MEANS ALL CONNECTED TO SAID HYBRID COIL, VARIABLE GAIN AMPLIFICATION MEANS, MEANS FOR CONNECTING SAID AMPLIFICATION MEANS IN A CLOSED LOOP INCLUDING SAID TRANSMITTING MEANS AND SAID RECEIVING MEANS, SAID AMPLIFICATION MEANS INCLUDING MEANS TO MAINTAIN A CONSTANT OUTPUT LEVEL INDEPENDENT OF INPUT LEVEL VARIATION, AND MEANS TO MEASURE THE GAIN OF SAID AMPLIFICATION MEANS.
References Cited (Backward Citations)
US2472211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |