US2977294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing oxide coatings on aluminum and aluminum alloys
Assignee: Sanford Process Co Inc
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Filing: 1957-04-05
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Granted: 1961-03-28
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Expires: 1977-04-05
Abstract
No abstract record available.
Inventors
- 👤 John B Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A PROCESS FOR COATING ALUMINUM ARTICLES WITH A HARD AND DENSE COATING OF OXIDE OF ALUMINUM WHICH COMPRISES PASSING AN ELECTRIC CURRENT AT INCREASING VOLTAGE THROUGH AN ELECTROLYTIC CELL CONTAINING AN ELECTROLYTE WITH SAID ARTICLE FORMING THE ANODE, SAID ELECTROLYTE COMPRISING A WATER SOLUTION OF SULFURIC ACID HAVING AN ACID CONCENTRATION EQUIVALENT TO BETWEEN ABOUT 16 AND 20% BY VOLUME OF SOLUTION OF 66 BAUME SULFURIC ACID AND AN OXIDE COATING ACCELERATOR AS ADDITIVE, UNTIL AN OXIDE COATING OF AT LEAST ABOUT .0005" AND NOT GREATER THAN .003" THICK IS FORMED AND CONTINUING TO ELECTROLYTICALLY OXIDIZE SAID ARTICLE AT INCREASING VOLTAGE IN AN ELECTROLYTE COMPRISING A WATER SOLUTION OF SULFURIC ACID HAVING AN ACID CONCENTRATION EQUIVALENT TO BETWEEN ABOUT 7 AND 12% BY VOLUME OF SOLUTION OF 66 BAUME SULFURIC ACID AND AN OXIDE COATING ACCELERATOR AS ADDITIVE, UNTIL A DESIRED INCREASE IN OXIDE COATING THICKNESS SUBSTANTIALLY GREATER THAN THE COATING THICKNESS PRODUCED IN SAID FIRST ELECTROLYTE IS FORMED.
Claim 2
Dependent Claim
159 words
A PROCESS FOR COATING ALUMINUM ARTICLES WITH A HARD AND DENSE COATING OF OXIDE OF ALUMINUM WHICH COMPRISES PASSING AN ELECTRIC CURRENT AT INCREASING VOLTAGE THROUGH AN ELECTROLYTIC CELL CONTAINING AN ELECTROLYTE WITH SAID ARTICLE FORMING THE ANODE, SAID ELECTROLYTE COMPRISING A WATER SOLUTION OF SULFURIC ACID HAVING AN ACID CONCENTRATION EQUIVALENT TO BETWEEN ABOUT 16 AND 20% BY VOLUME OF SOLUTION OF 66 BAUME SULFURIC ACID AND AN OXIDE COATING ACCELERATOR AS ADDITIVE, UNTIL AN OXIDE COATING OF AT LEAST ABOUT .0005" AND NOT GREATER THAN .003" THICK IS FORMED AND CONTINUING TO ELECTROLYTICALLY OXIDIZE SAID ARTICLE AT INCREASING VOLTAGE IN AN ELECTROLYTE COMPRISING A WATER SOLUTION OF SULFURIC ACID HAVING AN ACID CONCENTRATION EQUIVALENT TO BETWEEN ABOUT 7 AND 12% BY VOLUME OF SOLUTION OF 66 BAUME SULFURIC ACID AND AN OXIDE COATING ACCELERATOR AS ADDITIVE, UNTIL A DESIRED INCREASE IN OXIDE COATING THICKNESS SUBSTANTIALLY GREATER THAN THE COATING THICKNESS PRODUCED IN SAID FIRST ELECTROLYTE IS FORMED.
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |