Patent US3100281A successfully refreshed from Google Patents.
US3100281A
Expired / Lapsed
US
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Apparatus for measuring annular offset between a first metal tube and a second metal tube spatially disposed within the first tube
Assignee: Individual
•
Filing: 1961-09-28
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Granted: 1963-08-06
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Expires: 1981-09-28
Abstract
No abstract record available.
Inventors
- 👤 Jack C Spanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:57
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/30; G01B7/31; G01B7/312
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
AN APPARATUS FOR MEASURING THE AMOUNT OF OFFSET FROM CONCENTRICITY BETWEEN A FIRST METAL TUBE MOUNTED WITHIN A SECOND METAL TUBE COMPRISING A PLURALITY OF SENS ING COILS DISPOSED WITHIN SAID FIRST TUBE ADJACENT THE INTERIOR SURFACE THEREOF, MEANS FOR APPLYING AN A.-C. SIGNAL HAVING A PREDETERMINED FREQUENCY TO SAID SENSING COILS, THE FREQUENCY OF SAID A.-C. SIGNAL BEING SUCH THAT THE RESULTANT ELECTROMAGNETIC ENERGY FROM SAID SENSING COILS PASSES THROUGH SAID FIRST TUBE AND IS AT LEAST PARTIALLY ATTENUATED BY SAID SECOND TUBE, AND MEANS FOR DIFFERENTIALLY MEASURING THE EFFECTIVE IMPEDANCES OF SAID SENSING COILS, WHICH DIFFERENTIAL MEASUREMENTS ARE A FUNCTION OF THE AMOUNT OF OFFSET BETWEEN SAID FIRST AND SECOND TUBES.
Claim 2
Independent Claim
113 words
AN APPARATUS FOR MEASURING THE AMOUNT OF OFFSET FROM CONCENTRICITY BETWEEN A FIRST METAL TUBE MOUNTED WITHIN A SECOND METAL TUBE COMPRISING A PLURALITY OF SENS ING COILS DISPOSED WITHIN SAID FIRST TUBE ADJACENT THE INTERIOR SURFACE THEREOF, MEANS FOR APPLYING AN A.-C. SIGNAL HAVING A PREDETERMINED FREQUENCY TO SAID SENSING COILS, THE FREQUENCY OF SAID A.-C. SIGNAL BEING SUCH THAT THE RESULTANT ELECTROMAGNETIC ENERGY FROM SAID SENSING COILS PASSES THROUGH SAID FIRST TUBE AND IS AT LEAST PARTIALLY ATTENUATED BY SAID SECOND TUBE, AND MEANS FOR DIFFERENTIALLY MEASURING THE EFFECTIVE IMPEDANCES OF SAID SENSING COILS, WHICH DIFFERENTIAL MEASUREMENTS ARE A FUNCTION OF THE AMOUNT OF OFFSET BETWEEN SAID FIRST AND SECOND TUBES.
References Cited (Backward Citations)
AT190289B
Cited
US2985824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-05 | 1967-02-04 | 1967-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-05 | 1971-02-04 | 1971-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-05 | 1975-02-04 | 1975-08-06 | $7700.00 | Window Closed / Lapsed |