Patent US3020219A successfully refreshed from Google Patents.
US3020219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing oxide coatings on high silicon aluminum alloy
Assignee: Electralab Printed Electronics Corp
•
Filing: 1959-01-12
•
Granted: 1962-02-06
•
Expires: 1979-01-12
Abstract
No abstract record available.
Inventors
- 👤 John B Franklin
- 👤 Jr Norton W Vallance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:48
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/06; C25D11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR COATING HIGH SILICON ALUMINUM ALLOY ARTICLES HAVING AT LEAST 7% SILICON WITH A HARD AND DENSE COATING OF OXIDE OF ALUMINUM WHICH COMPRISES PASSING AN ELECTRIC CURRENT AT INCREASING CONSTANT VOLTAGE INCREMENTS THROUGH AN ELECTROLYTIC CELL CONTAINING AN ELECTROLYTE WITH SAID ARTICLE FORMING THE ANODE, SAID ELECTROLYTE MAINTAINED BETWEEN ABOUT 20* AND 50* F. AND COMPRISING A WATER SOLUTION OF BETWEEN ABOUT 19% AND 25% BY VOLUME OF 66 BAUME SULFURIC ACID AND AN AQUEOUS PEAT EXTRACT AS ADDITIVE, INTERRUPTING THE VOLTAGE RISE AT BETWEEN ABOUT 65 AND 90 VOLTS WHEN AN OXIDE COATING OF BETWEEN ABOUT .001" AND .0015" THICK IS FORMED, AND MAINTIANING THE VOLTAGE SUSBTANTIALLY CONSTANT FOR A PERIOD OF ABOUT 15 TO 45 MINUTES AT SAID INTERRUPTED VOLTAGE VALUE TO INCREASE THE OXIDE COATING THICKNESS DURING SAID PERIOD.
Claim 2
Dependent Claim
135 words
A PROCESS FOR COATING HIGH SILICON ALUMINUM ALLOY ARTICLES HAVING AT LEAST 7% SILICON WITH A HARD AND DENSE COATING OF OXIDE OF ALUMINUM WHICH COMPRISES PASSING AN ELECTRIC CURRENT AT INCREASING CONSTANT VOLTAGE INCREMENTS THROUGH AN ELECTROLYTIC CELL CONTAINING AN ELECTROLYTE WITH SAID ARTICLE FORMING THE ANODE, SAID ELECTROLYTE MAINTAINED BETWEEN ABOUT 20* AND 50* F. AND COMPRISING A WATER SOLUTION OF BETWEEN ABOUT 19% AND 25% BY VOLUME OF 66 BAUME SULFURIC ACID AND AN AQUEOUS PEAT EXTRACT AS ADDITIVE, INTERRUPTING THE VOLTAGE RISE AT BETWEEN ABOUT 65 AND 90 VOLTS WHEN AN OXIDE COATING OF BETWEEN ABOUT .001" AND .0015" THICK IS FORMED, AND MAINTIANING THE VOLTAGE SUSBTANTIALLY CONSTANT FOR A PERIOD OF ABOUT 15 TO 45 MINUTES AT SAID INTERRUPTED VOLTAGE VALUE TO INCREASE THE OXIDE COATING THICKNESS DURING SAID PERIOD.
References Cited (Backward Citations)
US1771910A
Cited
US2111377A
Cited
GB716554A
Cited
US2897125A
Cited
US2743221A
Cited
US2855352A
Cited
US2918416A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |