Patent US2811473A successfully refreshed from Google Patents.
US2811473A
Expired / Lapsed
US
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Composition and method for increasing surface resistivity of silicon steel
Assignee: United States Steel Corp
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Filing: 1953-12-07
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Granted: 1957-10-29
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Expires: 1973-12-07
Abstract
No abstract record available.
Inventors
- 👤 William S Allen
- 👤 Orlando E Romig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:59
CPC Classifications
C; C23; C23C; C23C22/00; C23C24/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE METHOD OF TREATING SILICON STEEL STOCK AND THE LIKE TO PRODUCE UPON THE SURFACES THEREOF A TIGHTLY ADHERENT COATING CHARACTERIZED BY BEING NON-HYGROSCOPIC AND INERT TO TRANSFORM OIL AND HAVING A SURFACE RESISTIVITY IN EXCESS OF 100,000 OHMS/CM.2/STRIP AT PRESSURES OF 1000 P.S.I. WHICH COMPRISES APPLYING TO THE SURFACES OF SAID STOCK A THIN UNIFORM FILM OF A SLURRY CONTAINING 5 TO 40% BY WEIGHT OF SILICIA HAVING A MAXIMUM PARTICLE SIZE OF 5 MICRONS DISPERSED IN AN AQUEOUS SOLUTION OF AMMONIUM PHOSPHATES HAVING A PHOF BETWEEN 5 AND 9 AND PRESENT IN AMOUNTS SUFFICIENT TO CONSTITUTE 5 TO 30% BY WEIGHT OF THE SLURRY, AND THEN HEATING THE COATED STOCK TO A TEMPERATURE OF 400 TO 1600*F. TO DRY AND CURE THE COATING TO THE SURFACES OF SAID STOCK.
Claim 2
Independent Claim
131 words
THE METHOD OF TREATING SILICON STEEL STOCK AND THE LIKE TO PRODUCE UPON THE SURFACES THEREOF A TIGHTLY ADHERENT COATING CHARACTERIZED BY BEING NON-HYGROSCOPIC AND INERT TO TRANSFORM OIL AND HAVING A SURFACE RESISTIVITY IN EXCESS OF 100,000 OHMS/CM.2/STRIP AT PRESSURES OF 1000 P.S.I. WHICH COMPRISES APPLYING TO THE SURFACES OF SAID STOCK A THIN UNIFORM FILM OF A SLURRY CONTAINING 5 TO 40% BY WEIGHT OF SILICIA HAVING A MAXIMUM PARTICLE SIZE OF 5 MICRONS DISPERSED IN AN AQUEOUS SOLUTION OF AMMONIUM PHOSPHATES HAVING A PHOF BETWEEN 5 AND 9 AND PRESENT IN AMOUNTS SUFFICIENT TO CONSTITUTE 5 TO 30% BY WEIGHT OF THE SLURRY, AND THEN HEATING THE COATED STOCK TO A TEMPERATURE OF 400 TO 1600*F. TO DRY AND CURE THE COATING TO THE SURFACES OF SAID STOCK.
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) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |