Patent US3843422A successfully refreshed from Google Patents.
US3843422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling method for producing silicon steel strip
Assignee: Allegheny Ludlum Corp
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Filing: 1972-03-30
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Granted: 1974-10-22
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Expires: 1992-03-30
Abstract
Abstract 1. THE METHOD OF PRODUCING GRAIN ORIENTED SILICON STEEL STRIP FOR MAGNETIC PURPOSES FROM SLABS COMPRISING THE STEPS OF: (A) HEATING THE SLABS TO A TEMPERATURE ABOVE 2200* F., TO STABILIZED MNS, AND IMMEDIATELY ROLLING SAID SLABS INTO STRIP IN A PLANETARY MILL TO A THICKNESS RANGE OF ABOUT 0.060 TO 0.150 INCH WHILE MAINTAINING THE TEMPERATURE IN THE TEMPERATURE RANGE OF 2100* F. TO 2200*F., DURING SAID ROLLING, (B) COOLING THE STRIP TO A TEMPERATURE BELOR 1500* F. AND ABOVE 300* F., AND (C) REDUCING THE STRIP IN THICKNESS TO ABOUT 0.020 TO 0.030 INCH WHILE IN THE TEMPERATURE RANGE 300* F. TO 1500*F.
Inventors
- 👤 R Henke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:03
CPC Classifications
B; B21; B21B; B21B13/00; B21B13/18; B21B13/20; B21B3/00; B21B3/02; C; C21; C21D; C21D8/00; C21D8/12; C21D8/1216; C21D8/1222; C21D8/1227
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
THE METHOD OF PRODUCING GRAIN ORIENTED SILICON STEEL STRIP FOR MAGNETIC PURPOSES FROM SLABS COMPRISING THE STEPS OF: (A) HEATING THE SLABS TO A TEMPERATURE ABOVE 2200* F., TO STABILIZED MNS, AND IMMEDIATELY ROLLING SAID SLABS INTO STRIP IN A PLANETARY MILL TO A THICKNESS RANGE OF ABOUT 0.060 TO 0.150 INCH WHILE MAINTAINING THE TEMPERATURE IN THE TEMPERATURE RANGE OF 2100* F. TO 2200*F., DURING SAID ROLLING, (B) COOLING THE STRIP TO A TEMPERATURE BELOR 1500* F. AND ABOVE 300* F., AND (C) REDUCING THE STRIP IN THICKNESS TO ABOUT 0.020 TO 0.030 INCH WHILE IN THE TEMPERATURE RANGE 300* F. TO 1500*F.
Claim 2
Independent Claim
104 words
THE METHOD OF PRODUCING GRAIN ORIENTED SILICON STEEL STRIP FOR MAGNETIC PURPOSES FROM SLABS COMPRISING THE STEPS OF: (A) HEATING THE SLABS TO A TEMPERATURE ABOVE 2200* F., TO STABILIZED MNS, AND IMMEDIATELY ROLLING SAID SLABS INTO STRIP IN A PLANETARY MILL TO A THICKNESS RANGE OF ABOUT 0.060 TO 0.150 INCH WHILE MAINTAINING THE TEMPERATURE IN THE TEMPERATURE RANGE OF 2100* F. TO 2200*F., DURING SAID ROLLING, (B) COOLING THE STRIP TO A TEMPERATURE BELOR 1500* F. AND ABOVE 300* F., AND (C) REDUCING THE STRIP IN THICKNESS TO ABOUT 0.020 TO 0.030 INCH WHILE IN THE TEMPERATURE RANGE 300* F. TO 1500*F.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |