US3237117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized d.-c. amplifier
Assignee: Systron Donner Corp
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Filing: 1962-02-19
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Granted: 1966-02-22
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Jerry M Collings
- 👤 Delbert F Waltrip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:03
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/303; H03F3/00; H03F3/38; H03F3/387
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
226 words
IN AN OPERATIONAL AMPLIFIER FOR AMPLIFYING AN INPUT SIGNAL HAVING HIGH AND LOW FREQUENCY COMPONENTS, AN INPUT TERMINAL, A WIDE BAND D.C. AMPLIFIER HAVING FIRST AND SECOND INPUTS, MEANS CONNECTING THE INPUT TERMINAL TO THE FIRST INPUT OF THE WIDE BAND D.C. AMPLIFIER AND SERVING TO ESSENTIALLY BLOCK OUT THE D.C. SIGNAL WHEREBY THE RELATIVELY HIGH FREQUENCY COMPONENTS OF THE INPUT SIGNAL ARE APPLIED TO THE FIRST INPUT OF THE WIDE BAND D.C. AMPLIFIER, CHOPPER AMPLIFIER MEANS CONNECTED TO THE INPUT TERMINAL AND TO THE SECOND INPUT OF THE WIDE BAND D.C. AMPLIFIER FOR APPLYING THE RELATIVELY LOW FREQUENCY COMPONENTS OF THE INPUT SIGNAL TO THE WIDE BAND D.C. AMPLIFIER, SAID COPPER AMPLIFIER MEANS COMPRISING A CHOPPER HAVING AN INPUT AND A OUTPUT, A FILTER CONNECTED TO THE INPUT TERMINAL AND TO THE INPUT OF THE CHOPPER FOR FILTERING OUT THE HIGH FREQUENCY COMPONENTS OF THE INPUT SIGNAL, SAID CHOPPER SERVING TO MODULATE THE LOW FREQUENCY COMPONENTS TO PROVIDE A CARRIER MODULATED SIGNAL, CARRIER AMPLIFIER MEANS HAVING AN OUTPUT AND INCLUDING A DIFFERENTIAL AMPLIFIER INPUT STAGE HAVING FIRST AND SECOND INPUTS, MEANS CONNECTING THE OUTPUT OF THE CHOPPER TO THE FIRST INPUT OF THE DIFFERENTIAL AMPLIFIER STAGE AND SERVING TO COUPLE THE CARRIER MODULATED SIGNAL TO THE CARRIER AMPLIFIER MEANS WHEREBY THE SAME MAY BE AMPLIFIED AND ALSO SERVING TO PREVENT FEEDBACK OF ERRONEOUS ESSENTIALLY D.C.
Claim 2
Dependent Claim
226 words
IN AN OPERATIONAL AMPLIFIER FOR AMPLIFYING AN INPUT SIGNAL HAVING HIGH AND LOW FREQUENCY COMPONENTS, AN INPUT TERMINAL, A WIDE BAND D.C. AMPLIFIER HAVING FIRST AND SECOND INPUTS, MEANS CONNECTING THE INPUT TERMINAL TO THE FIRST INPUT OF THE WIDE BAND D.C. AMPLIFIER AND SERVING TO ESSENTIALLY BLOCK OUT THE D.C. SIGNAL WHEREBY THE RELATIVELY HIGH FREQUENCY COMPONENTS OF THE INPUT SIGNAL ARE APPLIED TO THE FIRST INPUT OF THE WIDE BAND D.C. AMPLIFIER, CHOPPER AMPLIFIER MEANS CONNECTED TO THE INPUT TERMINAL AND TO THE SECOND INPUT OF THE WIDE BAND D.C. AMPLIFIER FOR APPLYING THE RELATIVELY LOW FREQUENCY COMPONENTS OF THE INPUT SIGNAL TO THE WIDE BAND D.C. AMPLIFIER, SAID COPPER AMPLIFIER MEANS COMPRISING A CHOPPER HAVING AN INPUT AND A OUTPUT, A FILTER CONNECTED TO THE INPUT TERMINAL AND TO THE INPUT OF THE CHOPPER FOR FILTERING OUT THE HIGH FREQUENCY COMPONENTS OF THE INPUT SIGNAL, SAID CHOPPER SERVING TO MODULATE THE LOW FREQUENCY COMPONENTS TO PROVIDE A CARRIER MODULATED SIGNAL, CARRIER AMPLIFIER MEANS HAVING AN OUTPUT AND INCLUDING A DIFFERENTIAL AMPLIFIER INPUT STAGE HAVING FIRST AND SECOND INPUTS, MEANS CONNECTING THE OUTPUT OF THE CHOPPER TO THE FIRST INPUT OF THE DIFFERENTIAL AMPLIFIER STAGE AND SERVING TO COUPLE THE CARRIER MODULATED SIGNAL TO THE CARRIER AMPLIFIER MEANS WHEREBY THE SAME MAY BE AMPLIFIED AND ALSO SERVING TO PREVENT FEEDBACK OF ERRONEOUS ESSENTIALLY D.C.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |