Patent US3237446A successfully refreshed from Google Patents.
US3237446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective defect detection and thickness measuring method and apparatus
Assignee: AMF Inc
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Filing: 1964-04-24
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Granted: 1966-03-01
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Expires: 1984-04-24
Abstract
No abstract record available.
Inventors
- 👤 Fenton M Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:19
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/07; G01N27/00; G01N27/72; G01N27/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A METHOD OF INSPECTING A TEST OBJECT FOR PITS AND INTERNAL DEFECTS, COMPRISING THE STEPS OF, INSPECTION A PORTION OF A TEST OBJECT WITH ULTRASONIC ENERGY BY GENERATING AN ULTRASONIC PULSE AND PRODUCING A FIRST ELECTRICAL SIGNAL THAT VARIES WITH THE TIME RELATION OF THE FRONT SURFACE ECHO PULSE TO A SUBSEQUENT ECHO PULSE FROM THE TEST OBJECT; MAGNETIZING SAID PORTION OF SAID TEST OBJECT WITH A D.C. MAGNETIC FIELD; DETECTING THE MAGNETIC FLUX AT THE SURFACE OF SAID PORTION OF THE TEST OBJECT TRANSVERSE TO THE DIRECTION OF MAGNETIZATION TO PRODUCE A SECOND ELECTRICAL SIGNAL REPRESENTATIVE ONLY OF DEFECTS HAVING A SUBSTANTIAL DIMENSION TRANSVERSE TO SAID MAGNETIC FLUX; AND SELECTIVELY CONTROLLING AN ELECTRICAL INDICATING DEVICE WITH SAID SECOND SIGNAL TO OBTAIN FROM SAID FIRST SIGNAL INFORMATION WITH RESPECT TO ONLY THOSE DEFECTS HAVING A SUBSTANTIAL DIMENSION TRANSVERSE TO SAID MAGNETIC FLUX.
Claim 2
Independent Claim
142 words
A METHOD OF INSPECTING A TEST OBJECT FOR PITS AND INTERNAL DEFECTS, COMPRISING THE STEPS OF, INSPECTION A PORTION OF A TEST OBJECT WITH ULTRASONIC ENERGY BY GENERATING AN ULTRASONIC PULSE AND PRODUCING A FIRST ELECTRICAL SIGNAL THAT VARIES WITH THE TIME RELATION OF THE FRONT SURFACE ECHO PULSE TO A SUBSEQUENT ECHO PULSE FROM THE TEST OBJECT; MAGNETIZING SAID PORTION OF SAID TEST OBJECT WITH A D.C. MAGNETIC FIELD; DETECTING THE MAGNETIC FLUX AT THE SURFACE OF SAID PORTION OF THE TEST OBJECT TRANSVERSE TO THE DIRECTION OF MAGNETIZATION TO PRODUCE A SECOND ELECTRICAL SIGNAL REPRESENTATIVE ONLY OF DEFECTS HAVING A SUBSTANTIAL DIMENSION TRANSVERSE TO SAID MAGNETIC FLUX; AND SELECTIVELY CONTROLLING AN ELECTRICAL INDICATING DEVICE WITH SAID SECOND SIGNAL TO OBTAIN FROM SAID FIRST SIGNAL INFORMATION WITH RESPECT TO ONLY THOSE DEFECTS HAVING A SUBSTANTIAL DIMENSION TRANSVERSE TO SAID MAGNETIC FLUX.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |