Patent US3121196A successfully refreshed from Google Patents.
US3121196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for measuring electrical air-earth current
Assignee: Individual
•
Filing: 1961-02-06
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Granted: 1964-02-11
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Expires: 1981-02-06
Abstract
No abstract record available.
Inventors
- 👤 Heinz W Kasemir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:59
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
AN INSTRUMENT FOR MEASURING ELECTRICAL AIR-EARTH CURRENT COMPRISING TWO CONDUCTIVE CURRENT COLLECTORS OF EQUAL SIZE SYMMETRICALLY DISPOSED WITH RESPECT TO A PARALLEL CONNECTED RESISTOR-CAPACITOR NETWORK, SAID CURRENT COLLECTORS BEING CONNECTED AT THEIR INNER ENDS TO OPPOSITE ENDS OF SAID NETWORK, SAID RESISTOR HAVING A RESISTANCE LESS THAN 1% OF THE RESISTANCE OF THAT PART OF THE SURROUNDING ATMOSPHERE FROM WHICH CURRENT IS DIVERTED BY SAID TWO CURRENT COLLECTORS, SAID RESISTOR-CAPACITOR NETWORK HAVING A TIME CONSTANT APPROXIMATELY EQUAL TO THAT OF THE SURROUNDING AIR, AND MEANS CONNECTED TO SAID RESISTOR-CAPACITOR NETWORK FOR MEASURING THE VOLTAGE DEVELOPED THEREACROSS.
Claim 2
Dependent Claim
96 words
AN INSTRUMENT FOR MEASURING ELECTRICAL AIR-EARTH CURRENT COMPRISING TWO CONDUCTIVE CURRENT COLLECTORS OF EQUAL SIZE SYMMETRICALLY DISPOSED WITH RESPECT TO A PARALLEL CONNECTED RESISTOR-CAPACITOR NETWORK, SAID CURRENT COLLECTORS BEING CONNECTED AT THEIR INNER ENDS TO OPPOSITE ENDS OF SAID NETWORK, SAID RESISTOR HAVING A RESISTANCE LESS THAN 1% OF THE RESISTANCE OF THAT PART OF THE SURROUNDING ATMOSPHERE FROM WHICH CURRENT IS DIVERTED BY SAID TWO CURRENT COLLECTORS, SAID RESISTOR-CAPACITOR NETWORK HAVING A TIME CONSTANT APPROXIMATELY EQUAL TO THAT OF THE SURROUNDING AIR, AND MEANS CONNECTED TO SAID RESISTOR-CAPACITOR NETWORK FOR MEASURING THE VOLTAGE DEVELOPED THEREACROSS.
References Cited (Backward Citations)
US2993165A
Cited
US1919215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-10 | 1967-08-12 | 1968-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-10 | 1971-08-12 | 1972-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-10 | 1975-08-12 | 1976-02-11 | $7700.00 | Window Closed / Lapsed |