US3252875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum anodizing method
Assignee: Alcoa Corp
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Filing: 1961-11-09
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Granted: 1966-05-24
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Expires: 1981-11-09
Abstract
No abstract record available.
Inventors
- 👤 Economy George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:32
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A METHOD OF ANODIZING ALUMINUM, COMPRISING MAKING AN ALUMINUM ARTICLE ANODE IN AN ELECTROLYTE CONSISTING ESSENTIALLY OF AT LEAST 10 GRAMS PER LITER OF OXALIC ACID (CALCULATED AS HO2C.CO2H.2H2O), AT LEAST 1/4 GRAM PERLITER OF SULFATE (CALCULATED AS H2SO4) PROVIDED BY AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID AND WATER SOLUBLE SULFATES AND BISULFATES, AND WATER, THE WEIGHT RATION (R) OF SAID OXALIC ACID TO SAID SULFATE BEING AT LEAST THAT EXPRESSED BY THE FORMULA: R=21-2/15T, WHERE T IS THE ELECTROLYTE TEMPERATURE IN *F., WHILE THE ELECTROLYTE IS MAINTAINED AT A TEMPEATURE BETWEEN ABOUT 55 AND 90*F., FOR A TIME OF TREATMENT SUFFICIENT TO PRODUCE AN ANODIC OXIDE COATING OF SUBSTANTIAL THICKNESS.
Claim 2
Independent Claim
117 words
A METHOD OF ANODIZING ALUMINUM, COMPRISING MAKING AN ALUMINUM ARTICLE ANODE IN AN ELECTROLYTE CONSISTING ESSENTIALLY OF AT LEAST 10 GRAMS PER LITER OF OXALIC ACID (CALCULATED AS HO2C.CO2H.2H2O), AT LEAST 1/4 GRAM PERLITER OF SULFATE (CALCULATED AS H2SO4) PROVIDED BY AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID AND WATER SOLUBLE SULFATES AND BISULFATES, AND WATER, THE WEIGHT RATION (R) OF SAID OXALIC ACID TO SAID SULFATE BEING AT LEAST THAT EXPRESSED BY THE FORMULA: R=21-2/15T, WHERE T IS THE ELECTROLYTE TEMPERATURE IN *F., WHILE THE ELECTROLYTE IS MAINTAINED AT A TEMPEATURE BETWEEN ABOUT 55 AND 90*F., FOR A TIME OF TREATMENT SUFFICIENT TO PRODUCE AN ANODIC OXIDE COATING OF SUBSTANTIAL THICKNESS.
References Cited (Backward Citations)
US1965682A
Cited
US2998358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |