Patent US3206697A successfully refreshed from Google Patents.
US3206697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified wien-bridge rc oscillator
Assignee: Bausch and Lomb Inc
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Filing: 1961-09-08
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Granted: 1965-09-14
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Expires: 1981-09-08
Abstract
No abstract record available.
Inventors
- 👤 Alexander E Martens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:52
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/20; H03B5/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A WIEN-BRIDGE OSCILLATOR CIRCUIT COMPRISING A FIRST AND A SECOND STAGE AMPLIFIER EACH HAVING A CATHODE, A GRID, AND A PLATE, A WEIN-BRIDGE HAVING TWO RESISTIVE LEGS AND TWO RESISTIVE-CAPACITIVE LEGS CONNECTED BETWEEN A CAPACITIVE COUPLING TO THE PLATE OF THE SECOND STAGE AMPLIFIER AND GROUND, A JUNCTION INTERMEDIATE THE RESISTIVECAPACITIVE LEGS OF SAID BRIDGE CONNECTED TO THE GRID OF THE FIRST STAGE AMPLIFIER TO PROVIDE POSTIIVE FEEDBACK TO SAID OSCILLATOR, A JUNCTION INTERMEDIATE THE RESISTIVE LEGS OF SAID BRIDGE CONNECTED TO THE CATHODE OF THE FIRST STAGE AMPLIFIER TO PROVIDE NEGATIVE FEEDBACK TO THE OSCILLATOR, A VARIABLE RESISTANCE FORMING ONE OF THE RESISTIVE LEGS IN SAID BRIDGE, A POSITIVE TEMPERATURE COEFFICIENT RESISTANCE FORMING THE SECOND RESISTANCE LEG OF SAID BRIDGE, A CAPACITIVE MEANS CONNECTED ACROSS A PORTION OF SAID VARIABLE RESISTANCE AND SAID POSITIVE TEMPERATURE COEFFICIENT RESISTANCE TO GROUND TO PROVIDE CAPACITANCE IN THE NEGATIVE FEEDBACK LOOP TO THEREBY IMPROVE LINEARITY OF FREQUENCY RESPONSE OF THE OSCILLATOR.
Claim 2
Dependent Claim
158 words
A WIEN-BRIDGE OSCILLATOR CIRCUIT COMPRISING A FIRST AND A SECOND STAGE AMPLIFIER EACH HAVING A CATHODE, A GRID, AND A PLATE, A WEIN-BRIDGE HAVING TWO RESISTIVE LEGS AND TWO RESISTIVE-CAPACITIVE LEGS CONNECTED BETWEEN A CAPACITIVE COUPLING TO THE PLATE OF THE SECOND STAGE AMPLIFIER AND GROUND, A JUNCTION INTERMEDIATE THE RESISTIVECAPACITIVE LEGS OF SAID BRIDGE CONNECTED TO THE GRID OF THE FIRST STAGE AMPLIFIER TO PROVIDE POSTIIVE FEEDBACK TO SAID OSCILLATOR, A JUNCTION INTERMEDIATE THE RESISTIVE LEGS OF SAID BRIDGE CONNECTED TO THE CATHODE OF THE FIRST STAGE AMPLIFIER TO PROVIDE NEGATIVE FEEDBACK TO THE OSCILLATOR, A VARIABLE RESISTANCE FORMING ONE OF THE RESISTIVE LEGS IN SAID BRIDGE, A POSITIVE TEMPERATURE COEFFICIENT RESISTANCE FORMING THE SECOND RESISTANCE LEG OF SAID BRIDGE, A CAPACITIVE MEANS CONNECTED ACROSS A PORTION OF SAID VARIABLE RESISTANCE AND SAID POSITIVE TEMPERATURE COEFFICIENT RESISTANCE TO GROUND TO PROVIDE CAPACITANCE IN THE NEGATIVE FEEDBACK LOOP TO THEREBY IMPROVE LINEARITY OF FREQUENCY RESPONSE OF THE OSCILLATOR.
References Cited (Backward Citations)
US2346396A
Cited
US2602139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |