Patent US3208000A successfully refreshed from Google Patents.
US3208000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized amplifiers
Assignee: HP Inc
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Filing: 1963-02-28
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Granted: 1965-09-21
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Expires: 1983-02-28
Abstract
No abstract record available.
Inventors
- 👤 Edgar G Stromer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:30
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/302
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A SIGNAL CIRCUIT COMPRISING: A FIRST AMPLIFIER HAVING AN INPUT CONNECTED TO RECEIVE AN APPLIED SIGNAL AND HAVING ANOTER INPUT AN AN OUTPUT; SECOND AND THIRD AMPLIFIERS, EACH HAVING AN INPUT AND AN OUTPUT; MENS CONNECTING THE INPUT OF THE SECOND AMPLIFIER TO THE OUTPUT OF THE FIRST AMPLIFIER; A LOW PASS FILTER; A FIRST NEGATIVE FEEDBACK PATH INCLUDING SAID FILTER AND THE THIRD AMPLIFIER CONNECTED TO THE OUTPUT OF THE SECOND AMPLIFIER; A FREQUENCY-INSENSITIVE SIGNAL CONDUCTING CIRCUIT CONNECTED TO THE OUTPUT OF THE SEOCND AMPLIFIER FOR PROVIDING A SECOND SEPARATE NEGATIVE FEEDBACK PATH; MEANS CONNECTED TO SAID OTHER INPUT OF THE FIRST AMPLIFIER FOR APPLYING THERETO THE COMBINATION OF SIGNALS FROM THE FIRST AND SECOND NEGATIVE FEEDBACK PATHS; AND A UTILIZATION CIRCUIT CONNECTED TO THE OUTPUT OF SAID SECOND AMPLIFIER.
Claim 2
Dependent Claim
131 words
A SIGNAL CIRCUIT COMPRISING: A FIRST AMPLIFIER HAVING AN INPUT CONNECTED TO RECEIVE AN APPLIED SIGNAL AND HAVING ANOTER INPUT AN AN OUTPUT; SECOND AND THIRD AMPLIFIERS, EACH HAVING AN INPUT AND AN OUTPUT; MENS CONNECTING THE INPUT OF THE SECOND AMPLIFIER TO THE OUTPUT OF THE FIRST AMPLIFIER; A LOW PASS FILTER; A FIRST NEGATIVE FEEDBACK PATH INCLUDING SAID FILTER AND THE THIRD AMPLIFIER CONNECTED TO THE OUTPUT OF THE SECOND AMPLIFIER; A FREQUENCY-INSENSITIVE SIGNAL CONDUCTING CIRCUIT CONNECTED TO THE OUTPUT OF THE SEOCND AMPLIFIER FOR PROVIDING A SECOND SEPARATE NEGATIVE FEEDBACK PATH; MEANS CONNECTED TO SAID OTHER INPUT OF THE FIRST AMPLIFIER FOR APPLYING THERETO THE COMBINATION OF SIGNALS FROM THE FIRST AND SECOND NEGATIVE FEEDBACK PATHS; AND A UTILIZATION CIRCUIT CONNECTED TO THE OUTPUT OF SAID SECOND AMPLIFIER.
References Cited (Backward Citations)
US2261335A
Cited
US2793256A
Cited
US2886659A
Cited
US3025472A
Cited
US2979666A
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US3131258A
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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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |