US2790739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating core plates and composition therefor
Assignee: United States Steel Corp
•
Filing: 1953-12-07
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Granted: 1957-04-30
•
Expires: 1973-12-07
Abstract
No abstract record available.
Inventors
- 👤 William J Frederick
- 👤 Orlando E Romig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:15
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; C23C22/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF TREATING FERROUS MAGNETIC STOCK TO INCREASE THE ELECTRICAL SURFACE RESISTIVITY THEREOF WHICH COMPRISES APPLYING TO CLEANED SURFACES OF THE STOCK A THIN FILM OF SLURRY CONSISTING OF 300-900 GRAMS OF AN INSOLUBLE PHOSPHATE SELECTED FROM THE GROUP CONSISTING OF MANGANESE PHOSPHATE, ALUMINUM METHAPHOSPHATE AND MIXTURES THEREOF DISPERSED IN A SOLUTION OF 50 TO 110 ML. OF 85% PHOSPHORIC ACID IN 1000 ML. OF WATER, SAID SLURRY BEING CHARACTERIZED BY A PARTICLE SIZE OF SAID INSOLUBLE PHOSPHATE INGREDIENT OF LESS THAN 8 MICRONS, AND THEN HEATING THE SLURRY COATED STOCK IN AN OXIDIZING ATMOSPHERE TO A TEMPERATURE BETWEEN 400 AND 1500*F. TO DRY AND REACT THE PHOSPHORIC ACID OF THE SLURRY WITH THE IRON OF THE STOCK SURFACES.
Claim 2
Independent Claim
120 words
THE METHOD OF TREATING FERROUS MAGNETIC STOCK TO INCREASE THE ELECTRICAL SURFACE RESISTIVITY THEREOF WHICH COMPRISES APPLYING TO CLEANED SURFACES OF THE STOCK A THIN FILM OF SLURRY CONSISTING OF 300-900 GRAMS OF AN INSOLUBLE PHOSPHATE SELECTED FROM THE GROUP CONSISTING OF MANGANESE PHOSPHATE, ALUMINUM METHAPHOSPHATE AND MIXTURES THEREOF DISPERSED IN A SOLUTION OF 50 TO 110 ML. OF 85% PHOSPHORIC ACID IN 1000 ML. OF WATER, SAID SLURRY BEING CHARACTERIZED BY A PARTICLE SIZE OF SAID INSOLUBLE PHOSPHATE INGREDIENT OF LESS THAN 8 MICRONS, AND THEN HEATING THE SLURRY COATED STOCK IN AN OXIDIZING ATMOSPHERE TO A TEMPERATURE BETWEEN 400 AND 1500*F. TO DRY AND REACT THE PHOSPHORIC ACID OF THE SLURRY WITH THE IRON OF THE STOCK SURFACES.
References Cited (Backward Citations)
US2329065A
Cited
US2398529A
Cited
GB638889A
Cited
US2492095A
Cited
US2554250A
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US2564864A
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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) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |