US2855565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for non-destructive examination of ferro-magnetic workpieces for non-homogeneous spots
Assignee: Individual
•
Filing: 1956-01-03
•
Granted: 1958-10-07
•
Expires: 1976-01-03
Abstract
No abstract record available.
Inventors
- 👤 Enders Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:36
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
THE METHOD FOR NON-DESTRUCTIVE EXAMINATION OF FERRO-MAGNETIC SEAM WELDED TUBES FOR NON-HOMEGENOUS SPOTS BY INDUCING EDDY CURRENTS AND MEASURING THE ELECTRICAL CONDUCTIVITY, COMPRISING ANNEALING THE TUBE AT A TEMPERATURE AT LEAST AT THE CURIE POINT, PASSING THE TUBE WHILE STILL AT A TEMPERATURE OF AT LEAST THE CURIE POINT THROUGH SOLENOID COILS CONNECTED TO A MEASURING INSTRUMENT AND MEASURING ANY VARIATION IN EDDY CURRENTS AS SAID WORKPIECE PASSES TO DETERMINE THE LOCATION OF FAULTS AND NON-HOMOGENITY IN THE WORKPIECE.
References Cited (Backward Citations)
US1321347A
Cited
US1457438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |