Patent US3410300A successfully refreshed from Google Patents.
Patent US3166710A successfully refreshed from Google Patents.
US3166710A
Expired / Lapsed
US
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Apparatus having segmented pickup coil and output circuit means responsive to signals from a single coil segment
Assignee: Shell USA Inc
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Filing: 1960-11-14
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Granted: 1965-01-19
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Expires: 1980-11-14
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9006
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
A PICK-UP COIL SYSTEM FOR AN EDDY CURRENT TESTING INSTRUMENT HAVING AN EXCITER COIL COUPLED TO A SOURCE OF ALTERNATING CURRENT, SAID PICK-UP COIL SYSTEM COMPRISING: A PICK-UP COIL FORMED FROM A PLURALITY OF INDIVIDUAL COILS, SAID INDIVIDUAL COILS BEING DISPOSED IN A CLOSED PATTERN WITH EQUAL SPACING BETWEEN THE CENTERS OF THE COILS; A PLURALITY OF INDIVIDUAL AMPLIFYING AND DIFFERENTIATING CIRCUIT MEANS, EACH OF SAID INDIVIDUAL COILS BEING COUPLED TO ONE OF SAID AMPLIFYING AND DIFFERENTIATING CIRCUIT MEANS; AN AUCTIONEERING CIRCUIT, SAID INDIVIDUAL AMPLIFYING AND DIFFERENTIATING CIRCUITS BEING COUPLED TO SAID AUCTIONEERING CIRCUIT IN PARALLEL, SAID AUCTIONEERING CIRCUIT PASSING ONLY THE FIRST OCCURING SIGNAL FROM SAID INDIVIDUAL COILS.
References Cited (Backward Citations)
US2124579A
Cited
US2558485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-01-19 | 1968-07-20 | 1969-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-19 | 1972-07-20 | 1973-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-19 | 1976-07-20 | 1977-01-19 | $7700.00 | Window Closed / Lapsed |