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Patent US3138494A successfully refreshed from Google Patents.
US3138494A
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Method of annealing magnetic materials
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1961-05-01
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Granted: 1964-06-23
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Expires: 1981-05-01
Abstract
No abstract record available.
Inventors
- 👤 Robert E Burket
- 👤 Donald M Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:29
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE METHOD FOR IMPROVING THE MAGNETIC CHARACTERISTICS OF DIRECT CURRENT HYSTERESIS LOOP RECTANGULARITY, HIGH PERMEABILITY AND LOW COERCIVE FORCE IN MAGNETICALLY SOFT MATERIALS SELECTED FROM THE GROUP CONSISTING OF METALS HAVING SUBSTANTIALLY A COMPOSITION WHICH FALLS WITHIN THE SHADED AREAS OF THE TRIAXIAL DIGRAMOF THE ACCOMPANYING FIG. 3 AND 2% TO 6% SILICON IN IRON ALLOYS, THE STEPS COMPRISING, SUBJECTING THE MAGNETICALLY SOFT MATERIAL TO A MAGNETIC FIELD HAVING AN INTENSITY WITHIN THE RANGE BETWEEN THAT SUFFICIENTLY GREAT TO EXCEED THE KNEE OF THE HYSTEREIS LOOP OF THE MATERIAL BEING TREATED AND THAT SUFFICIENT TO ACHIEVE MAGNETIC SATURATION, REMOVING THE MAGNETIC FIELD TO LEAVE SAID MATERIAL AT REMANENE, AND THEREAFTER ANNEALING SAID MATERIAL FREE OF SAID MAGNETIC FIELD AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 300*F. BELOW THE CURIE TEMPERATURE OF SAID MATERIAL TO WITHIN 2*F. OF THE CURIE TEMPERATURE OF SAID MATERIAL.
Claim 2
Independent Claim
144 words
THE METHOD FOR IMPROVING THE MAGNETIC CHARACTERISTICS OF DIRECT CURRENT HYSTERESIS LOOP RECTANGULARITY, HIGH PERMEABILITY AND LOW COERCIVE FORCE IN MAGNETICALLY SOFT MATERIALS SELECTED FROM THE GROUP CONSISTING OF METALS HAVING SUBSTANTIALLY A COMPOSITION WHICH FALLS WITHIN THE SHADED AREAS OF THE TRIAXIAL DIGRAMOF THE ACCOMPANYING FIG. 3 AND 2% TO 6% SILICON IN IRON ALLOYS, THE STEPS COMPRISING, SUBJECTING THE MAGNETICALLY SOFT MATERIAL TO A MAGNETIC FIELD HAVING AN INTENSITY WITHIN THE RANGE BETWEEN THAT SUFFICIENTLY GREAT TO EXCEED THE KNEE OF THE HYSTEREIS LOOP OF THE MATERIAL BEING TREATED AND THAT SUFFICIENT TO ACHIEVE MAGNETIC SATURATION, REMOVING THE MAGNETIC FIELD TO LEAVE SAID MATERIAL AT REMANENE, AND THEREAFTER ANNEALING SAID MATERIAL FREE OF SAID MAGNETIC FIELD AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 300*F. BELOW THE CURIE TEMPERATURE OF SAID MATERIAL TO WITHIN 2*F. OF THE CURIE TEMPERATURE OF SAID MATERIAL.
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) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |