US3739261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring the amount of cold working in a stainless steel sample
Assignee: United States Atomic Energy Commission
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Filing: 1971-06-28
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Granted: 1973-06-12
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Expires: 1991-06-28
Abstract
Abstract The amount of cold working in a stainless steel sample is determined by magnetizing the stainless steel sample in a predetermined direction and mounting a magnetic-field-sensing apparatus in magnetic coupled relationship with the stainless steel sample. The stainless steel sample is then moved relative to the magnetic-field-sensing apparatus to modulate the magnetic coupling therebetween responsive to the relative motion and provide magnetic-field scanning of the sample. The signal sensed by the magnetic-field-sensing apparatus is filtered to pass only the modulation frequency of the magnetic coupling, which filtered sensed magnetic-field signal provides a measure of cold working in the stainless steel sample.
Inventors
- 👤 C Renken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:02
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A method for measuring the amount of cold working in a stainless steel sample comprising magnetizing said stainless steel sample in a predetermined direction, mounting a pair of probes of a magnetometer in differential signal-combining relationship with respect to each other, magnetically coupling said stainless steel sample to one of said magnetometer probes, generating relative motion between said stainless steel sample and said sample-coupled probe to modulate the magnetic coupling between said coupled probe and sample and effect magnetic-field scanning of said sample, filtering the differently combined magnetic-field sensed signal of said magnetometer to selectively accept only the modulation frequency of said magnetic coupling, and measuring the filtered sensed magnetometer signal to provide a measure of cold work in said stainless steel sample.
Claim 2
Independent Claim
123 words
A method for measuring the amount of cold working in a stainless steel sample comprising magnetizing said stainless steel sample in a predetermined direction, mounting a pair of probes of a magnetometer in differential signal-combining relationship with respect to each other, magnetically coupling said stainless steel sample to one of said magnetometer probes, generating relative motion between said stainless steel sample and said sample-coupled probe to modulate the magnetic coupling between said coupled probe and sample and effect magnetic-field scanning of said sample, filtering the differently combined magnetic-field sensed signal of said magnetometer to selectively accept only the modulation frequency of said magnetic coupling, and measuring the filtered sensed magnetometer signal to provide a measure of cold work in said stainless steel sample.
Claim 3
Dependent Claim
125 words
The method according to claim 1 wherein said stainless sample is cylindrical in shape and said magnetizing of said stainless steel sample comprises generating a first magnetic field to provide unidirectional flux lines diametrically through said stainless steel sample, generating a second magnetic field to provide time-varying flux lines axially through said stainless steel sample, generating relative rotational and translational motion between said stainless steel sample and said first and second magnetic fields to effect radial and axial field demagnetization of said stainless steel sample, generating a third magnetic field to provide unidirectional flux lines through said stainless steel sample, and generating relative translational motion between said stainless steel sample and said third magnetic field to provide magnetization of said sample in a predetermined direction.
Claim 4
Dependent Claim
29 words
THe method according to claim 2 wherein said magnetic-coupling-modulation and sample-scan motion generation comprises generating relative rotational and translational motion between said stainless steel sample and said sample-coupled probe.
Claim 5
Independent Claim
100 words
A method for measuring the amount of cold working in a stainless steel sample comprising magnetizing said stainless steel sample in a predetermined direction, mounting a magnetic-field-sensing apparatus in magnetic coupled relationship with said stainless steel sample, moving said stainless steel sample relative said magnetic-field-sensing apparatus to modulate the magnetic coupling therebetween responsive to said relative motion and provide magnetic-field sensing of said sample, filtering the magnetic-field-signal sensed by said apparatus to pass only the modulation frequency of said magnetic coupling, and measuring the filtered sensed magnetic-field signal to provide a measure of cold working in said stainless steel sample.
Claim 6
Independent Claim
100 words
A method for measuring the amount of cold working in a stainless steel sample comprising magnetizing said stainless steel sample in a predetermined direction, mounting a magnetic-field-sensing apparatus in magnetic coupled relationship with said stainless steel sample, moving said stainless steel sample relative said magnetic-field-sensing apparatus to modulate the magnetic coupling therebetween responsive to said relative motion and provide magnetic-field sensing of said sample, filtering the magnetic-field-signal sensed by said apparatus to pass only the modulation frequency of said magnetic coupling, and measuring the filtered sensed magnetic-field signal to provide a measure of cold working in said stainless steel sample.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |