Patent US4529453A successfully refreshed from Google Patents.
US4529453A
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Medium silicon steel electrical lamination strip
Assignee: Inland Steel Co
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Filing: 1982-11-08
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Granted: 1985-07-16
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Expires: 2002-11-08
Abstract
Abstract The chemical composition and processing of a cold rolled steel strip are controlled. Laminations for the core of an electric motor are stamped from the strip and decarburized to produce a lamination having a 1.5 T (15 kG) average core loss value less than about 5.1 W/kg (2.30 W/lb.) and average peak permeability more than about 1800 G/Oe. for a sample thickness of about 0.018 in. (0.46 mm.).
Inventors
- 👤 Prahbat K. Rastogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:16
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1233; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; C21D8/1222; C21D8/1244; C21D8/1255; C21D8/1266
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
An electric motor lamination comprising: a steel composition consisting essentially of, in wt.%: ______________________________________
carbon .006 max.
manganese .50-.70
silicon .85-1.05
aluminum .20-.30
phosphorus .08 max.
sulfur .02 max.
iron essentially the balance;
______________________________________ a microstructure consisting essentially of ferrite grains with an average ferritic grain size of about 4.0-5.0 ASTM; a preponderance of crystallographic planes containing the easiest direction of magnetization; and a 1.5 T (15 kG) average core loss value less than about 5.1 W/kg (2.3 W/lb.) and average peak permeability more than about 1,800 G/Oe. for a thickness of about 0.018 in. (0.46 mm.).
Claim 2
Dependent Claim
97 words
An electric motor lamination comprising: a steel composition consisting essentially of, in wt.%: ______________________________________
carbon .006 max.
manganese .50-.70
silicon .85-1.05
aluminum .20-.30
phosphorus .08 max.
sulfur .02 max.
iron essentially the balance;
______________________________________ a microstructure consisting essentially of ferrite grains with an average ferritic grain size of about 4.0-5.0 ASTM; a preponderance of crystallographic planes containing the easiest direction of magnetization; and a 1.5 T (15 kG) average core loss value less than about 5.1 W/kg (2.3 W/lb.) and average peak permeability more than about 1,800 G/Oe. for a thickness of about 0.018 in. (0.46 mm.).
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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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |