US3039910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating aluminum surfaces
Assignee: Alcoa Corp
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Filing: 1958-11-10
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Granted: 1962-06-19
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Expires: 1978-11-10
Abstract
No abstract record available.
Inventors
- 👤 Walter G Zelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:47
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A METHOD OF IMPARTING A DECORATIVE FINISH TO SURFACES OF ALUMINUM ARTICLES BY REVEALING THEIR SURFACES CRYSTALS FACES COMPRISING IMMERSING SAID ARTICLES IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF AQUA REGIA AND A SOLUBLE NITRITE ION AND MAINTAINED AT A TEMPERATURE OF ABOUT 70 TO 100*F., SAID NITRITE ION BEING PRESENT IN AN AMOUNT CAUSING A REDDISH-BROWN COLORATION OF SAID SOLUTION AT THE AFORESAID TEMPERATURE.
Claim 2
Independent Claim
65 words
A METHOD OF IMPARTING A DECORATIVE FINISH TO SURFACES OF ALUMINUM ARTICLES BY REVEALING THEIR SURFACES CRYSTALS FACES COMPRISING IMMERSING SAID ARTICLES IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF AQUA REGIA AND A SOLUBLE NITRITE ION AND MAINTAINED AT A TEMPERATURE OF ABOUT 70 TO 100*F., SAID NITRITE ION BEING PRESENT IN AN AMOUNT CAUSING A REDDISH-BROWN COLORATION OF SAID SOLUTION AT THE AFORESAID TEMPERATURE.
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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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |