Patent US3302129A successfully refreshed from Google Patents.
US3302129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-frequency generator with three feedback controls
Assignee: Charbonnages de France CDF
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Filing: 1965-10-22
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Granted: 1967-01-31
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Chaumont Jean De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:28
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/14; H; H03; H03B; H03B5/00; H03B5/20; H03B5/24; H03B5/26; H03C; H03C3/00; H03C3/10; H03C3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A HIGH-GAIN APERIODIC VARIABLE-FREQUENCY GENERATOR HAVING A LOW INPUT RESISTANCE, SAID GENERATOR COMPRISING A MEASURING BRIDGE, AN AMPLIFIER OF WHICH ONE FREQUENCY CORRESPONDS TO THE BALANCE OF SAID BRIDGE, AN INPUT ATTENUATOR FOR SAID AMPLIFIER, AND A SELECTIVE CIRCUIT, IN WHICH THERE IS APPLIED TO THE INPUT OF SAID AMPLIFIER, A CURRENT RESULTING FROM THE FOLLOWING COMPOSITION: A REACTION CURRENT IN PHASE WITH THE OUTPUT VOLTAGE OF THE AMPLIFIER; A CURRENT IN QUADRATURE WITH SAID REACTION CURRENT AND INJECTED BY THE MEASURING BRIDGE, SAID BRIDGE BEING EXCITED BY A VOLTAGE OF FREQUENCY EQUAL TO THE FREQUENCY DELIVERED BY SAID AMPLIFIER; AND A CURRENT IN PHASE OPPOSITION WITH THE CURRENT INJECTED BY THE MEASURING BRIDGE, SAID OPPOSITION CURRENT BEING SUPPLIED BY THE SELECTIVE CIRCUIT TUNED TO THE FREQUENCY CORRESPONDING TO THE EQUILIBRIUM OF THE BRIDGE, SAID SELECTIVE CIRCUIT BEING EXCITED BY A VOLTAGE OF AMPLITUDE PROPORTIONAL TO THE SIGNAL EXCITING THE BRIDGE OF PHASE SUCH, WITH RESPECT TO SAID SIGNAL, THAT FOR A VARIATION OF THE FREQUENCY DELIVERED BY THE GENERATOR, SAID SELECTIVE CIRCUIT INTRO-
Claim 2
Dependent Claim
174 words
A HIGH-GAIN APERIODIC VARIABLE-FREQUENCY GENERATOR HAVING A LOW INPUT RESISTANCE, SAID GENERATOR COMPRISING A MEASURING BRIDGE, AN AMPLIFIER OF WHICH ONE FREQUENCY CORRESPONDS TO THE BALANCE OF SAID BRIDGE, AN INPUT ATTENUATOR FOR SAID AMPLIFIER, AND A SELECTIVE CIRCUIT, IN WHICH THERE IS APPLIED TO THE INPUT OF SAID AMPLIFIER, A CURRENT RESULTING FROM THE FOLLOWING COMPOSITION: A REACTION CURRENT IN PHASE WITH THE OUTPUT VOLTAGE OF THE AMPLIFIER; A CURRENT IN QUADRATURE WITH SAID REACTION CURRENT AND INJECTED BY THE MEASURING BRIDGE, SAID BRIDGE BEING EXCITED BY A VOLTAGE OF FREQUENCY EQUAL TO THE FREQUENCY DELIVERED BY SAID AMPLIFIER; AND A CURRENT IN PHASE OPPOSITION WITH THE CURRENT INJECTED BY THE MEASURING BRIDGE, SAID OPPOSITION CURRENT BEING SUPPLIED BY THE SELECTIVE CIRCUIT TUNED TO THE FREQUENCY CORRESPONDING TO THE EQUILIBRIUM OF THE BRIDGE, SAID SELECTIVE CIRCUIT BEING EXCITED BY A VOLTAGE OF AMPLITUDE PROPORTIONAL TO THE SIGNAL EXCITING THE BRIDGE OF PHASE SUCH, WITH RESPECT TO SAID SIGNAL, THAT FOR A VARIATION OF THE FREQUENCY DELIVERED BY THE GENERATOR, SAID SELECTIVE CIRCUIT INTRO-
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |