Patent FR2218530A1 successfully refreshed from Google Patents.
US3109137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bridge circuit
Assignee: Halliburton Co
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Filing: 1959-03-24
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Granted: 1963-10-29
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Expires: 1979-03-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Richard H Huddleston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:29
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/22; G01K7/24; G01K7/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A MEASURING SYSTEM OF THE CHARACTER DESCRIBED, A FOUR-ARM BRIDGE NETWORK HAVING A PAIR OF POWER INPUT TERMINALS AND A PAIR OF OUTPUT MEASURING TERMINALS, A FIRST SERIES CIRCUIT BETWEEN SAID POWER TERMINALS COMPRISING A FIRST IMPEDANCE MEANS AND A SECOND IMPEDANCE MEANS WHICH FORM RESPECTIVELY A FIRST AND A SECOND ARM OF SAID BRIDGE AND WHICH ARE INTERCONNECTED AT ONE OF SAID MEASURING TERMINALS, A SECOND SERIES CIRCUIT BETWEEN SAID POWER TERMINALS COMPRISING A THIRD IMPEDANCE MEANS AND A FOURTH IMPEDANCE MEANS WHICH FORM RESPECTIVELY A THIRD AND A FOURTH ARM OF SAID NETWORK AND WHICH ARE INTERCONNECTED AT A SECOND ONE OF SAID MEASURING TERMINALS, ADJUSTABLE IMPEDANCE MEANS, A POWER SOURCE CONNECTED IN SERIES WITH SAID ADJUSTABLE IMPEDANCE MEANS AND SAID POWER TERMINALS, SAID THIRD IMPEDANCE MEANS COMPRISING A PAIR OF SERIES-CONNECTED IMPEDANCE, AND MEANS AUTOMATICALLY ADJUSTING THE MAGNITUDE OF SAID ADJUSTABLE IMPEDANCE MEANS TO MAINTAIN THE VOLTAGE ACROSS ONE OF SAID PAIR OF IMPEDANCES SUBSTANTIALLY CONSTANT.
Claim 2
Dependent Claim
160 words
IN A MEASURING SYSTEM OF THE CHARACTER DESCRIBED, A FOUR-ARM BRIDGE NETWORK HAVING A PAIR OF POWER INPUT TERMINALS AND A PAIR OF OUTPUT MEASURING TERMINALS, A FIRST SERIES CIRCUIT BETWEEN SAID POWER TERMINALS COMPRISING A FIRST IMPEDANCE MEANS AND A SECOND IMPEDANCE MEANS WHICH FORM RESPECTIVELY A FIRST AND A SECOND ARM OF SAID BRIDGE AND WHICH ARE INTERCONNECTED AT ONE OF SAID MEASURING TERMINALS, A SECOND SERIES CIRCUIT BETWEEN SAID POWER TERMINALS COMPRISING A THIRD IMPEDANCE MEANS AND A FOURTH IMPEDANCE MEANS WHICH FORM RESPECTIVELY A THIRD AND A FOURTH ARM OF SAID NETWORK AND WHICH ARE INTERCONNECTED AT A SECOND ONE OF SAID MEASURING TERMINALS, ADJUSTABLE IMPEDANCE MEANS, A POWER SOURCE CONNECTED IN SERIES WITH SAID ADJUSTABLE IMPEDANCE MEANS AND SAID POWER TERMINALS, SAID THIRD IMPEDANCE MEANS COMPRISING A PAIR OF SERIES-CONNECTED IMPEDANCE, AND MEANS AUTOMATICALLY ADJUSTING THE MAGNITUDE OF SAID ADJUSTABLE IMPEDANCE MEANS TO MAINTAIN THE VOLTAGE ACROSS ONE OF SAID PAIR OF IMPEDANCES SUBSTANTIALLY CONSTANT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-10-28 | 1967-04-29 | 1967-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-28 | 1971-04-29 | 1971-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-28 | 1975-04-29 | 1975-10-29 | $7700.00 | Window Closed / Lapsed |