Patent US3379973A successfully refreshed from Google Patents.
US3379973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impedance measuring circuit having the unknown impedance in the feedback path of an amplifier
Assignee: NEOTEC Corp A CORP OF DE
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Filing: 1966-01-10
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Granted: 1968-04-23
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Expires: 1986-01-10
Abstract
No abstract record available.
Inventors
- 👤 John F Walton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:45
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
AN IMPEDANCE MEASURING CIRCUIT COMPRISING AN IMPEDANCE BRIDGE HAVING AN IMPEDANCE TO BE MEASURED CONNECTED IN ONE ARM OF SAID BRIDGE, AND MEANS FOR MAINTAINING A CONSTANT CURRENT IN SAID ONE ARM OF SAID BRIDGE SO AS TO MAINTAIN SAID BRIDGE IN A BALANCED CONDITION DESPITE VARIATIONS IN SAID IMPEDANCE TO BE MEASURED,
Claim 2
Dependent Claim
53 words
AN IMPEDANCE MEASURING CIRCUIT COMPRISING AN IMPEDANCE BRIDGE HAVING AN IMPEDANCE TO BE MEASURED CONNECTED IN ONE ARM OF SAID BRIDGE, AND MEANS FOR MAINTAINING A CONSTANT CURRENT IN SAID ONE ARM OF SAID BRIDGE SO AS TO MAINTAIN SAID BRIDGE IN A BALANCED CONDITION DESPITE VARIATIONS IN SAID IMPEDANCE TO BE MEASURED,
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) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |