US2650157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brightening aluminum
Assignee: Alcoa Corp
•
Filing: 1947-12-31
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Granted: 1953-08-25
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Expires: 1967-12-31
Abstract
No abstract record available.
Inventors
- 👤 William C Cochran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:00
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF CHEMICALLY BRIGHTENING A SURFACE OF AN ALUMINUM ARTICLE WHICH COMPRISES IMMERSING SAID ARTICLE IN A SOLUTION HAVING AS THE ESSENTIAL COMPONENTS THEREOF, ON A WEIGHT BASIS REFERRED TO THE TOTAL WEIGHT OF PHOSPHORIC ACID, NITRIC ACID AND WATER THEREIN, ABOUT 73 TO 83 PER CENT PHOSPHORIC ACID, ABOUT 2 TO 5 PER CENT NITRIC ACID AND ABOUT 14 TO 23 PER CENT WATER, THE SOLUTION BEING MAINTAINED AT A TEMPERATURE ABOVE ABOUT 70* C., WHEREIN THE SPECULARITY OF THE SURFACE OF THE ALUMINUM ARTICLE IS IMPROVED AS DETERMINED FROM LUMINOUS APPARENT REFLECTANCE MEASUREMENTS OBTAINED BY USE OF A STANDARD HUNTER MULTIPURPOSE REFLECTOMETER.
Claim 2
Independent Claim
105 words
THE METHOD OF CHEMICALLY BRIGHTENING A SURFACE OF AN ALUMINUM ARTICLE WHICH COMPRISES IMMERSING SAID ARTICLE IN A SOLUTION HAVING AS THE ESSENTIAL COMPONENTS THEREOF, ON A WEIGHT BASIS REFERRED TO THE TOTAL WEIGHT OF PHOSPHORIC ACID, NITRIC ACID AND WATER THEREIN, ABOUT 73 TO 83 PER CENT PHOSPHORIC ACID, ABOUT 2 TO 5 PER CENT NITRIC ACID AND ABOUT 14 TO 23 PER CENT WATER, THE SOLUTION BEING MAINTAINED AT A TEMPERATURE ABOVE ABOUT 70* C., WHEREIN THE SPECULARITY OF THE SURFACE OF THE ALUMINUM ARTICLE IS IMPROVED AS DETERMINED FROM LUMINOUS APPARENT REFLECTANCE MEASUREMENTS OBTAINED BY USE OF A STANDARD HUNTER MULTIPURPOSE REFLECTOMETER.
References Cited (Backward Citations)
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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) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |