US3383618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suppression of intermodulation distortion
Assignee: AT&T Inc
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Filing: 1966-03-10
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Granted: 1968-05-14
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Expires: 1986-03-10
Abstract
No abstract record available.
Inventors
- 👤 Rudolf S Engelbrecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:39
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3241; H03F1/3252; H03F1/3276
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
146 words
IN COMBINATION: AN INPUT LINE FOR TRANSMITTING ENERGY AT TWO DISCRETE SIGNAL FREQUENCIES; AN ELECTRONIC DEVICE CONNECTED TO THE INPUT LINE FOR SIMULTANEOUSLY OPERATING ON ENERGY AT BOTH FREQUENCIES AND FOR TRANSMITTING IT TO AN OUTPUT LINE, SAID OPERATION RESULTING IN THE GENERATION OF SPURIOUS FIRST DISTORTION COMPONENTS WHICH ARE ALSO TRANSMITTED TO THE OUTPUT LINE; MEANS COMPRISING A COMPENSATION CIRCUIT FOR DERIVING A PREDETERMINED QUANTITY OF THE ENERGY AT THE TWO SIGNAL FREQUENCIES FROM THE OUTPUT LINE; MEANS COMPRISING A NON-LINEAR ELEMENT IN THE COMPENSATION CIRCUIT FOR GENERATING SECOND DISTORTION COMPONENTS IN RESPONSE TO THE DERIVED ENERGY; OUTPUT COUPLER MEANS FOR COUPLING THE SECOND DISTORTION COMPONENTS ONTO THE OUTPUT LINE; AND MEANS FOR ADJUSTING THE RELATIVE PHASE OF THE FIRST AND SECOND DISTORTION COMPONENTS TO BE AT SUBSTANTIALLY 180 DEGREES, WHEREBY AT LEAST PART OF THE FIRST DISTORTION COMPONENTS ARE CANCELLED AT THE OUTPUT COUPLER.
References Cited (Backward Citations)
US2968716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |