Patent US2791199A successfully refreshed from Google Patents.
US3135918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural input signal comparing means using differential electrometer amplifier means
Assignee: Individual
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Filing: 1961-05-23
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Granted: 1964-06-02
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Expires: 1981-05-23
Abstract
No abstract record available.
Inventors
- 👤 Bergson Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:46
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
AN ELECTRICAL CIRCUIT COMPRISING FIRST AND SECOND TERMINALS FOR CONNECTION TO A DIRECT CURRENT POWER SOURCE, A VOLTAGE DIVIDER COMPRISING FIRST, SECOND AND THIRD RESISTORS CONNECTED IN THE ORDER NAMED BETWEEN SAID FIRST AND SECOND TERMINALS, MEANS PROVIDING CONTACTING ELEMENTS ON SAID FIRST AND THIRD RESISTORS, A FIRST AMPLIFIER TUBE HAVING AN ANODE, CONTROL GRID AND CATHODE, MEANS FOR CONNECTING THE ANODE OF SAID FIRST TUBE TO THE CONTACTING ELEMENT ON SAID FIRST RESISTOR, A FIRST LOAD RESISTOR CONNECTED BETWEEN THE CATHODE OF SAID FIRST TUBE AND THE CONTACTING ELEMENT ON SAID THIRD RESISTOR, MEANS PROVIDING A SIGNAL INPUT CIRCUIT CONNECTED WITH THE CONTROL GRID OF SAID FIRST TUBE, A SECOND AMPLIFIER TUBE HAVING AN ANODE, A CATHODE AND A CONTROL GRID, MEANS CONNECTING THE ANODE OF SAID SECOND TUBE TO THE JUNCTION BETWEEN SAID FIRST AND SECOND RESISTORS, A SECOND LOAD RESISTOR CONNECTED BETWEEN THE CATHODE OF SAID SECOND TUBE AND SAID SECOND TERMINAL, MEANS PROVIDING A REFERENCE SIGNAL INPUT CIRCUIT CONNECTED WITH THE CONTROL GRID OF SAID SECOND TUBE, AND MEANS FOR COMPARING THE VOLTAGES DEVELOPED AT THE CATHODES OF SAID FIRST AND SECOND TUBES.
Claim 2
Dependent Claim
187 words
AN ELECTRICAL CIRCUIT COMPRISING FIRST AND SECOND TERMINALS FOR CONNECTION TO A DIRECT CURRENT POWER SOURCE, A VOLTAGE DIVIDER COMPRISING FIRST, SECOND AND THIRD RESISTORS CONNECTED IN THE ORDER NAMED BETWEEN SAID FIRST AND SECOND TERMINALS, MEANS PROVIDING CONTACTING ELEMENTS ON SAID FIRST AND THIRD RESISTORS, A FIRST AMPLIFIER TUBE HAVING AN ANODE, CONTROL GRID AND CATHODE, MEANS FOR CONNECTING THE ANODE OF SAID FIRST TUBE TO THE CONTACTING ELEMENT ON SAID FIRST RESISTOR, A FIRST LOAD RESISTOR CONNECTED BETWEEN THE CATHODE OF SAID FIRST TUBE AND THE CONTACTING ELEMENT ON SAID THIRD RESISTOR, MEANS PROVIDING A SIGNAL INPUT CIRCUIT CONNECTED WITH THE CONTROL GRID OF SAID FIRST TUBE, A SECOND AMPLIFIER TUBE HAVING AN ANODE, A CATHODE AND A CONTROL GRID, MEANS CONNECTING THE ANODE OF SAID SECOND TUBE TO THE JUNCTION BETWEEN SAID FIRST AND SECOND RESISTORS, A SECOND LOAD RESISTOR CONNECTED BETWEEN THE CATHODE OF SAID SECOND TUBE AND SAID SECOND TERMINAL, MEANS PROVIDING A REFERENCE SIGNAL INPUT CIRCUIT CONNECTED WITH THE CONTROL GRID OF SAID SECOND TUBE, AND MEANS FOR COMPARING THE VOLTAGES DEVELOPED AT THE CATHODES OF SAID FIRST AND SECOND TUBES.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |