US2638410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brightening nickel
Assignee: Alcoa Corp
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Filing: 1951-01-16
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Granted: 1953-05-12
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Expires: 1971-01-16
Abstract
No abstract record available.
Inventors
- 👤 Walter G Zelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:52
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/10; C23F; C23F3/00; C23F3/04; C23F3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A METHOD FOR CHEMICAL BRIGHTENING OF NICKEL WHICH COMPRISES IMMERSING A NICKEL ARTICLE IN A SOLUTION CONSISTING ESSENTIALLY OF ABOUT 45 TO 60 PER CENT PHOSPHERIC ACID, ABOUT 15 TO 25 PER CENT SULFURIC ACID, ABOUT 8 TO 15 PER CENT NITRIC ACID AND ABOUT 10 TO 20 PER CENT WATER, ON A WEIGHT BASIS REFERRED TO THE TOTAL WEIGHT OF THE AFORESAID COMPONENTS, THE SOLUTION BEING MAINTAINED AT A TEMPERATURE ABOVE ABOUT 65* C.
Claim 2
Independent Claim
75 words
A METHOD FOR CHEMICAL BRIGHTENING OF NICKEL WHICH COMPRISES IMMERSING A NICKEL ARTICLE IN A SOLUTION CONSISTING ESSENTIALLY OF ABOUT 45 TO 60 PER CENT PHOSPHERIC ACID, ABOUT 15 TO 25 PER CENT SULFURIC ACID, ABOUT 8 TO 15 PER CENT NITRIC ACID AND ABOUT 10 TO 20 PER CENT WATER, ON A WEIGHT BASIS REFERRED TO THE TOTAL WEIGHT OF THE AFORESAID COMPONENTS, THE SOLUTION BEING MAINTAINED AT A TEMPERATURE ABOVE ABOUT 65* C.
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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |