Patent US3221249A successfully refreshed from Google Patents.
US3221249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency measuring apparatus including dual rectifier means and transistor translating means
Assignee: Texas Instruments Inc
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Filing: 1962-07-19
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Granted: 1965-11-30
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Expires: 1982-07-19
Abstract
No abstract record available.
Inventors
- 👤 Robert A Shearer
- 👤 David W Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:56
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A FREQUENCY TRANSDUCER COMPRISING A SIGNAL INPUT CIRCUIT, A BRIDGE CIRCUIT HAVING A FIRST JUNCTION OF A PAIR OF OPPOSITELY POLED DIODES, A SECOND JUNCTION OF A PAIR OF CAPACITORS, A THIRD JUNCTION COUPLING TOGETHER ONE OF SAID DIODES AND ONE OF SAID CAPACITORS AND A FOURTH JUNCTION COUPLING TOGETHER THE OTHER OF SAID DIODES AND THE OTHER OF SAID CAPACITORS, SAID THIRD AND FOURTH JUNCTIONS BEING SHUNTED BY A SERIES CIRCUIT OF A GAS DIODE AND A RESISTOR, SAID FIRST JUNCTION AND SAID SECOND JUNCTION COUPLED ACROSS SAID INPUT CIRCUIT, SAID BRIDGE CIRCUIT LIMITING THE PEAK LEVEL OF THE SIGNAL APPLIED TO SAID INPUT CIRCUIT AND PROVIDING A DIRECT CURRENT REFERENCE LEVEL CLAMPED AT SAID PEAK
Claim 2
Dependent Claim
117 words
A FREQUENCY TRANSDUCER COMPRISING A SIGNAL INPUT CIRCUIT, A BRIDGE CIRCUIT HAVING A FIRST JUNCTION OF A PAIR OF OPPOSITELY POLED DIODES, A SECOND JUNCTION OF A PAIR OF CAPACITORS, A THIRD JUNCTION COUPLING TOGETHER ONE OF SAID DIODES AND ONE OF SAID CAPACITORS AND A FOURTH JUNCTION COUPLING TOGETHER THE OTHER OF SAID DIODES AND THE OTHER OF SAID CAPACITORS, SAID THIRD AND FOURTH JUNCTIONS BEING SHUNTED BY A SERIES CIRCUIT OF A GAS DIODE AND A RESISTOR, SAID FIRST JUNCTION AND SAID SECOND JUNCTION COUPLED ACROSS SAID INPUT CIRCUIT, SAID BRIDGE CIRCUIT LIMITING THE PEAK LEVEL OF THE SIGNAL APPLIED TO SAID INPUT CIRCUIT AND PROVIDING A DIRECT CURRENT REFERENCE LEVEL CLAMPED AT SAID PEAK
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |