US3273056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eddy current testing system in which the power applying circuit has a low output impedance relative to the effective input impedance of the test coil unit
Assignee: Magnaflux Corp
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Filing: 1963-03-22
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Granted: 1966-09-13
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Expires: 1983-03-22
Abstract
No abstract record available.
Inventors
- 👤 John J Flaherty
- 👤 John M Mountz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:48
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9046; G01N27/02; G01N27/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN AN EDDY CURRENT TESTING SYSTEM FOR DETERMINING THE CHARACTERISTICS OF A TEST PIECE, A TEST COIL UNIT INCLUDING A PRIMARY WINDING AND A PAIR OIF DIFFERENTIALLY CONNECTED SECONDARY WINDINGS, SIGNAL MEASURING MEANS CONNECTED TO SAID DIFFERENTIALLY CONNECTED SECONDARY WINDING A VARIABLE FREQUENCY OSCILLATOR OPERABLE OVER A CERTAIN FREQUENCY RANGE, AND A POWER APPLYING CIRCUIT CONNECTED TO SAID OSCILLATOR AND TO SAID PRIMARY WINDING OF SAID TEST COIL UNIT, SAID POWER APPLYING CIRCUIT HAVING A SUBSTANTIALLY CONSTANT VOLTAGE OUTPUT OVER SAID FREQUENCY RANGE AND HAVING A LOW EFFECTIVE OUTPUT IMPEDANCE RELATIVE TO THE EFFECTIVE INPUT IMPEDANCE OF SAID TEST COIL UNIT.
Claim 2
Dependent Claim
101 words
IN AN EDDY CURRENT TESTING SYSTEM FOR DETERMINING THE CHARACTERISTICS OF A TEST PIECE, A TEST COIL UNIT INCLUDING A PRIMARY WINDING AND A PAIR OIF DIFFERENTIALLY CONNECTED SECONDARY WINDINGS, SIGNAL MEASURING MEANS CONNECTED TO SAID DIFFERENTIALLY CONNECTED SECONDARY WINDING A VARIABLE FREQUENCY OSCILLATOR OPERABLE OVER A CERTAIN FREQUENCY RANGE, AND A POWER APPLYING CIRCUIT CONNECTED TO SAID OSCILLATOR AND TO SAID PRIMARY WINDING OF SAID TEST COIL UNIT, SAID POWER APPLYING CIRCUIT HAVING A SUBSTANTIALLY CONSTANT VOLTAGE OUTPUT OVER SAID FREQUENCY RANGE AND HAVING A LOW EFFECTIVE OUTPUT IMPEDANCE RELATIVE TO THE EFFECTIVE INPUT IMPEDANCE OF SAID TEST COIL UNIT.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |