Patent US3209253A successfully refreshed from Google Patents.
US3209253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency measuring circuit utilizing transistors to switch capacitor currents through an indicator
Assignee: General Precision Inc
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Filing: 1962-06-26
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Granted: 1965-09-28
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Expires: 1982-06-26
Abstract
No abstract record available.
Inventors
- 👤 John W Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:32
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R23/06; G01R23/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A FREQUENCY MEASURING CIRCUIT COMPRISING, A CAPACITOR HAVING AN ALTERNATING CURRENT IMPRESSED ON A FIRST TERMINAL THEREOF, SWITCH MEANS INCLUDING A PAIR OF TRANSISTORS EACH ININCLUDING BASE, EMITTER AND COLLECTOR ELECTRODES HAVING THEIR LIKE ELECTRODES OF THEIR EMITTER-COLLECTOR CIRCUITS CONNECTED TOGETHER WITH THE COMMON JUNCTION THEREOF CONNECTED TO A SECOND TERMINAL OF SAID CAPACITOR, CAPACTIVE MEANS COUPLING SAID ALTERNATING CURRENT TO THE BASES OF SAID PAIR OF TRANSISTOS, A DIODE CONNECTED BETWEEN THE BASE AND EMITTER OF EACH OF SAID TRANSISTORS, AND A MEASURING CIRCUIT INTERCONNECTING THE NONCOMMON ELECTRODES OF SAID EMITTER-COLLECTOR TRANSISTOR CIRCUITS, WHEREBY THE CURRENT FLOWING THEREIN IS LINEARLY PROPORTIONAL TO THE FREQUENCY OF SAID IMPRESSED ALTERNATING CURRENT.
Claim 2
Dependent Claim
110 words
A FREQUENCY MEASURING CIRCUIT COMPRISING, A CAPACITOR HAVING AN ALTERNATING CURRENT IMPRESSED ON A FIRST TERMINAL THEREOF, SWITCH MEANS INCLUDING A PAIR OF TRANSISTORS EACH ININCLUDING BASE, EMITTER AND COLLECTOR ELECTRODES HAVING THEIR LIKE ELECTRODES OF THEIR EMITTER-COLLECTOR CIRCUITS CONNECTED TOGETHER WITH THE COMMON JUNCTION THEREOF CONNECTED TO A SECOND TERMINAL OF SAID CAPACITOR, CAPACTIVE MEANS COUPLING SAID ALTERNATING CURRENT TO THE BASES OF SAID PAIR OF TRANSISTOS, A DIODE CONNECTED BETWEEN THE BASE AND EMITTER OF EACH OF SAID TRANSISTORS, AND A MEASURING CIRCUIT INTERCONNECTING THE NONCOMMON ELECTRODES OF SAID EMITTER-COLLECTOR TRANSISTOR CIRCUITS, WHEREBY THE CURRENT FLOWING THEREIN IS LINEARLY PROPORTIONAL TO THE FREQUENCY OF SAID IMPRESSED ALTERNATING CURRENT.
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |