Patent US3566258A successfully refreshed from Google Patents.
US3566258A
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US
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Eddy current flaw detector having automatically balancing bridge circuit
Assignee: JFE Engineering Corp
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Filing: 1968-03-22
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Granted: 1971-02-23
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Expires: 1988-03-22
Abstract
Abstract IN A EDDY CURRENT FLAW DETECTOR UTILIZING A BRIDGE CIRCUIT, A VARIABLE VOLTAGE SOURCE IS INCLUDED IN ONE ARM OF THE BRIDGE AND THE MAGNITUDE AND PHASE OF THE OUTPUT VOLTAGE OF THE VARIABLE SOURCE IS ADJUSTED BY AN ELECTRONIC MEANS TO AUTOMATICALLY BALANCE THE BRIDGE CIRCUIT.
Inventors
- 👤 Toshihiro Mori
- 👤 Seigo Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:49
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |