US2812296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical method for coating steel surfaces and the product thereof
Assignee: United States Steel Corp
•
Filing: 1956-06-22
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Granted: 1957-11-05
•
Expires: 1976-06-22
Abstract
No abstract record available.
Inventors
- 👤 Richard A Neish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:37
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/36; C25D11/38; C25D9/00; C25D9/04; C25D9/08; C25D9/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
IN A METHOD OF COATING SHEET STEEL, THE STEPS INCLUDING PASSING IT THROUGH A SOLUTION CONSISTING ESSENTIALLY OF FROM 1 TO 6% OF WATER-SOLUBEL CHROMATE IN WHICH THE CHROMIUM IS HEXAVALENT, WATER AND A COMPOUND CONTAINING THE ORTHOSPHOSPHATE RADICAL, THE AMOUNT OF SAID COMPOUND BEING SUCH AS TO PROVIDE AN ORTHOPHOSPHATE-IONCONCENTRATION IN THE SOLUTION OF FROM 1.0 TO 8.4%, SAID SOLUTION HAVING A PH VALUE OF FROM ABOUT 1 TO 2,SUBJECTING THE STEEL TO ELECTROLYSIS AS CATHODE WHILE IN THE SOLUTION, AT A CURRENT DENSITY OF FROM 15 TO 90 AMPS. P.S.F., THEN REMOVING THE STEEL FROM THE SOLUTION AND AT LEAST PARTIALLY DRYING THE LIQUID FILM ADHERING THERETO.
Claim 2
Dependent Claim
109 words
IN A METHOD OF COATING SHEET STEEL, THE STEPS INCLUDING PASSING IT THROUGH A SOLUTION CONSISTING ESSENTIALLY OF FROM 1 TO 6% OF WATER-SOLUBEL CHROMATE IN WHICH THE CHROMIUM IS HEXAVALENT, WATER AND A COMPOUND CONTAINING THE ORTHOSPHOSPHATE RADICAL, THE AMOUNT OF SAID COMPOUND BEING SUCH AS TO PROVIDE AN ORTHOPHOSPHATE-IONCONCENTRATION IN THE SOLUTION OF FROM 1.0 TO 8.4%, SAID SOLUTION HAVING A PH VALUE OF FROM ABOUT 1 TO 2,SUBJECTING THE STEEL TO ELECTROLYSIS AS CATHODE WHILE IN THE SOLUTION, AT A CURRENT DENSITY OF FROM 15 TO 90 AMPS. P.S.F., THEN REMOVING THE STEEL FROM THE SOLUTION AND AT LEAST PARTIALLY DRYING THE LIQUID FILM ADHERING THERETO.
Claim 3
Dependent Claim
120 words
AS AN ARTICLE OF MANUFACTURE, A METAL ARTICLE HAVING A STEEL SURFACE WITH A COATING THEREON FORMED BY PASSING THE ARTICLE THROUGH A SOLUTION CONSISTING ESSENTIALLY OF FROM 1 TO 6% OF A WATER-SOLUBLE CHROMATE IN WHICH THE CHROMIUM IS HEXAVALENT, WATER AND A COMPOUND CONTAINING THE ORTHOPHOSPHATE RADICAL, THE AMOUNT OF SAID COMPOUND BEING SUCH AS TO PROVIDE AN ORTHOPHOSPHATE-ION CONCENTRATION IN THE SOLUTION OF FROM 1.0 TO 8.4%, SAID SOLUTION HAVING A PH VALUE OF FROM ABOUT 1 TO 2, SUBJECTING THE STEEL TO ELECTROLYSIS AS CATHODE WHILE IN THE SOLUTION, AT A CURRENT DENSITY OF FROM 15 TO 90AMPS. P.S.F., THEN REMOVING THE STEEL FROM THE SOLUTION AND AT LEAST PARTIALLY DRYING THE LIQUID FILM ADHERING THERETO.
Claim 4
Dependent Claim
120 words
AS AN ARTICLE OF MANUFACTURE, A METAL ARTICLE HAVING A STEEL SURFACE WITH A COATING THEREON FORMED BY PASSING THE ARTICLE THROUGH A SOLUTION CONSISTING ESSENTIALLY OF FROM 1 TO 6% OF A WATER-SOLUBLE CHROMATE IN WHICH THE CHROMIUM IS HEXAVALENT, WATER AND A COMPOUND CONTAINING THE ORTHOPHOSPHATE RADICAL, THE AMOUNT OF SAID COMPOUND BEING SUCH AS TO PROVIDE AN ORTHOPHOSPHATE-ION CONCENTRATION IN THE SOLUTION OF FROM 1.0 TO 8.4%, SAID SOLUTION HAVING A PH VALUE OF FROM ABOUT 1 TO 2, SUBJECTING THE STEEL TO ELECTROLYSIS AS CATHODE WHILE IN THE SOLUTION, AT A CURRENT DENSITY OF FROM 15 TO 90AMPS. P.S.F., THEN REMOVING THE STEEL FROM THE SOLUTION AND AT LEAST PARTIALLY DRYING THE LIQUID FILM ADHERING THERETO.
References Cited (Backward Citations)
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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) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |