US3227639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of anodizing aluminum with electrolyte containing sulfophthalic acid
Assignee: Alcoa Corp
•
Filing: 1961-10-24
•
Granted: 1966-01-04
•
Expires: 1981-10-24
Abstract
No abstract record available.
Inventors
- 👤 William P Kampert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:56
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
54 words
THE METHOD OF ANODIZING ALUMINUM COMPRISING MAKING AN ALUMINUM ARTICLE ANODE IN AN OXIDE COATING PRODUCTIVE ELECTROLYTE CONSISTING ESSENTIALLY OF AT LEAST 10 GRAMS PER LITER OF SULFOPHTHALIC ACID, ABOUT 1 TO 20 GRAMS PER LITER OF SULFATE (CALCULATED AS H2SO4), AND WATER, FOR A TIME SUFFICIENT TO PRODUCE A COLORED ANODIC OXIDE COATING.
References Cited (Backward Citations)
US2233785A
Cited
US3031387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |