US3286168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for adjusting the amplitude and phase of pickup coils of eddy current instruments
Assignee: Shell USA Inc
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Filing: 1962-12-18
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Granted: 1966-11-15
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Expires: 1982-12-18
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:22
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
AN APPARATUS FOR ADJUSTING THE FLAW SENSITIVITY OF AN EDDY CURRENT INSTRUMENT USING A SOURCE COIL AND TWO PICKUP COILS COUPLED IN ELECTRICAL OPPOSITION, SAID PICKUP COILS BEING SPACED FROM SAID SOURCE COIL A DISTANCE AT LEAST EQUAL TO THE DIAMETER OF THE METALLIC MEMBER UNDER TEST, SAID APPARATUS COMPRISING: A FIRST CIRCUIT MEANS COUPLED TO ONE OF THE PICKUP COILS, SAID CIRCUIT MEANS INCLUDING INDIVIDUALLY ADJUSTABLE PHASE SHIFTING AND ATTENUATING NETWORKS SAID PHASE SHIFTING NETWORK IN ADDITION CHANGING THE PHASE OF THE PICKUP COIL SIGNAL WITHOUT CHANGING ITS AMPLITUDE; A SECOND CIRCUIT MEANS COUPLED TO THE OTHER OF SAID PICKUP COILS;
Claim 2
Independent Claim
102 words
AN APPARATUS FOR ADJUSTING THE FLAW SENSITIVITY OF AN EDDY CURRENT INSTRUMENT USING A SOURCE COIL AND TWO PICKUP COILS COUPLED IN ELECTRICAL OPPOSITION, SAID PICKUP COILS BEING SPACED FROM SAID SOURCE COIL A DISTANCE AT LEAST EQUAL TO THE DIAMETER OF THE METALLIC MEMBER UNDER TEST, SAID APPARATUS COMPRISING: A FIRST CIRCUIT MEANS COUPLED TO ONE OF THE PICKUP COILS, SAID CIRCUIT MEANS INCLUDING INDIVIDUALLY ADJUSTABLE PHASE SHIFTING AND ATTENUATING NETWORKS SAID PHASE SHIFTING NETWORK IN ADDITION CHANGING THE PHASE OF THE PICKUP COIL SIGNAL WITHOUT CHANGING ITS AMPLITUDE; A SECOND CIRCUIT MEANS COUPLED TO THE OTHER OF SAID PICKUP COILS;
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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |