US2980561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing improved magnetic steel strip
Assignee: Westinghouse Electric Corp
•
Filing: 1958-08-01
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Granted: 1961-04-18
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Expires: 1978-08-01
Abstract
No abstract record available.
Inventors
- 👤 James G Ford
- 👤 Thomas J Murrin
- 👤 John H Bramble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:41
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; H01F1/18; B; B21; B21D; B21D1/00; B21D1/02; C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1238; C21D9/00; C21D9/52; H01B; H01B3/00; H01B3/002; H01B3/006; H01B3/02; H01B3/04; C21D8/1244; C21D8/125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN THE PROCESS OF IMPROVING THE FLATNESS AND THE MAGNETIC PROPERTIES OF A SHEET OF FERROUS MAGNETIC STEEL, THE STEPS COMPRISING PREHEATING THE SHEET TO A TEMPERATURE OF FROM 700*C. TO 850*C., HOT ROLLER LEVELING THE SHEET WHILE IT IS AT THE TEMPERATURE IN ORDER TO IMPART THERETO AN INCREMENTAL STRETCHING TO REMOVE WAVINESS AND OTHER IRREGULARITIES WITHOUT INTRODUCING LONGITUDINAL CORRUGATIONS TO THE SHEET, SOAKING THE SHEET AT A TEMPERATURE OF FROM 770*C. TO 850*C. FOLLOWING THE HOT ROLLER LEVELING FOR A PERIOD OF TIME TO REMOVE PREVIOUSLY IMPARTED STRESSES FROM THE SHEET WHILE APPLYING A LONGITUDINAL TENSION OF FROM 100 TO 1000 P.S.I. AND COOLING THE SHEET SUBSTANTIALLY UNIFORMLY TO A TEMPERATURE OF BELOW 300*C. WITHOUT SUBJECTING THE SHEET TO ANY STRESSES OTHER THAN THE APPLIED LONGITUDINAL TENSION DURING THE SOAKING AND COOLING OPERTIONS.
Claim 2
Dependent Claim
135 words
IN THE PROCESS OF IMPROVING THE FLATNESS AND THE MAGNETIC PROPERTIES OF A SHEET OF FERROUS MAGNETIC STEEL, THE STEPS COMPRISING PREHEATING THE SHEET TO A TEMPERATURE OF FROM 700*C. TO 850*C., HOT ROLLER LEVELING THE SHEET WHILE IT IS AT THE TEMPERATURE IN ORDER TO IMPART THERETO AN INCREMENTAL STRETCHING TO REMOVE WAVINESS AND OTHER IRREGULARITIES WITHOUT INTRODUCING LONGITUDINAL CORRUGATIONS TO THE SHEET, SOAKING THE SHEET AT A TEMPERATURE OF FROM 770*C. TO 850*C. FOLLOWING THE HOT ROLLER LEVELING FOR A PERIOD OF TIME TO REMOVE PREVIOUSLY IMPARTED STRESSES FROM THE SHEET WHILE APPLYING A LONGITUDINAL TENSION OF FROM 100 TO 1000 P.S.I. AND COOLING THE SHEET SUBSTANTIALLY UNIFORMLY TO A TEMPERATURE OF BELOW 300*C. WITHOUT SUBJECTING THE SHEET TO ANY STRESSES OTHER THAN THE APPLIED LONGITUDINAL TENSION DURING THE SOAKING AND COOLING OPERTIONS.
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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) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |