Patent US2738295A successfully refreshed from Google Patents.
US2738295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing silicon steel laminations
Assignee: General Electric Co
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Filing: 1952-08-29
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Granted: 1956-03-13
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Expires: 1972-08-29
Abstract
No abstract record available.
Inventors
- 👤 Charles H Mcknight
- 👤 Dean W Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:57
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0206; H01F41/0233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
THE PROCESS OF PRODUCING LAMINATIONS OF COLD ROLLED STEEL HAVING A SILICON CONTENT BETWEEN 0.25% AND 3.5% COMPRISING, PRODUCING A HOT ROLLED SILICON STEEL STRIP HAVING A THICKNESS BETWEEN 0.07 AND 0.125 INCH, REMOVING SCALE FROM THE HOT ROLLED STRIP, COLD ROLL REDUCING THE STRIP TO A THICKNESS 2 TO 8% GREATER THAN FINAL GAUGE, NORMALIZING THE STRIP AT A TEMPERATURE OF 1500 TO 1825* F. IN A REDUCING ATMOSPHERE FOR A TIME OF THREE TO EIGHT MINUTES TO PRODUCE A FINE GRAIN STRUCTURE, COLD ROLL REDUCING THE STRIP TO FINAL GAUGE, FORMING LAMINATIONS OF PREDETERMINED SHAPE AND SIZE THEREFROM, AND ANNEALING THE LAMINATIONS AT A TEMPERATURE OF 1450* F. TO ABOUT 1600* F. FOR FROM ONE-HALF TO TWO HOURS TO RELIEVE THE STRAINS AND DEVELOP THE MAGNETIC CHARACTERISTICS OF THE STEEL.
Claim 2
Dependent Claim
132 words
THE PROCESS OF PRODUCING LAMINATIONS OF COLD ROLLED STEEL HAVING A SILICON CONTENT BETWEEN 0.25% AND 3.5% COMPRISING, PRODUCING A HOT ROLLED SILICON STEEL STRIP HAVING A THICKNESS BETWEEN 0.07 AND 0.125 INCH, REMOVING SCALE FROM THE HOT ROLLED STRIP, COLD ROLL REDUCING THE STRIP TO A THICKNESS 2 TO 8% GREATER THAN FINAL GAUGE, NORMALIZING THE STRIP AT A TEMPERATURE OF 1500 TO 1825* F. IN A REDUCING ATMOSPHERE FOR A TIME OF THREE TO EIGHT MINUTES TO PRODUCE A FINE GRAIN STRUCTURE, COLD ROLL REDUCING THE STRIP TO FINAL GAUGE, FORMING LAMINATIONS OF PREDETERMINED SHAPE AND SIZE THEREFROM, AND ANNEALING THE LAMINATIONS AT A TEMPERATURE OF 1450* F. TO ABOUT 1600* F. FOR FROM ONE-HALF TO TWO HOURS TO RELIEVE THE STRAINS AND DEVELOP THE MAGNETIC CHARACTERISTICS OF THE STEEL.
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) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |