Patent US3301720A successfully refreshed from Google Patents.
US3301720A
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Treatment of material for hysteresis application
Assignee: Allegheny Ludlum Steel Corp
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Filing: 1964-01-29
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Granted: 1967-01-31
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Expires: 1984-01-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Andrew J Griest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:18
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1227; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A METHOD OF PRODUCING A MATERIAL SUITABLE FOR ROTORS IN HYSTERESIS MOTORS COMPRISING THE STEPS OF, PRODUCING A MATERIAL HAVING FROM ABOUT 7.0% TO ABOUT 15% MANGANESE, THE BALANCE ESSENTIALLY IRON AND RESIDUAL IMPURITIES, AND REDUCING SAID MATERIAL AT LEAST 99% IN CROSS SECTIONAL AREA, SAID REDUCTION IN AREA BEING CARRIED OUT WITH THE MATERIAL BETWEEN ABOUT 800*F. AND 950*F.
Claim 2
Independent Claim
60 words
A METHOD OF PRODUCING A MATERIAL SUITABLE FOR ROTORS IN HYSTERESIS MOTORS COMPRISING THE STEPS OF, PRODUCING A MATERIAL HAVING FROM ABOUT 7.0% TO ABOUT 15% MANGANESE, THE BALANCE ESSENTIALLY IRON AND RESIDUAL IMPURITIES, AND REDUCING SAID MATERIAL AT LEAST 99% IN CROSS SECTIONAL AREA, SAID REDUCTION IN AREA BEING CARRIED OUT WITH THE MATERIAL BETWEEN ABOUT 800*F. AND 950*F.
References Cited (Backward Citations)
US2569468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |