Patent US2678875A successfully refreshed from Google Patents.
US2678875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical brightening of aluminum
Assignee: Alcan Research and Development Ltd
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Filing: 1950-06-29
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Granted: 1954-05-18
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Expires: 1970-06-29
Abstract
No abstract record available.
Inventors
- 👤 Roy C Spooner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:40
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD OF BRIGHTENING ALUMINUM WHICH COMPRISES SUBJECTING THE SAME TO A HOT, CONCENTRATED PHOSPHORIC AND NITRIC ACID BRIGHTENING BATH WHICH CONTAINS A MAJOR PROPORTION OF PHOSPHORIC ACID AND A MINOR PROPORTION OF NITRIC ACID, AND INHIBITING THE METAL-DISSOLVING CHEMICAL ACTION OF THE BATH ON THE ALUMINUM RELATIVE TO THE ATTAINMENT OF A DESIRED BRIGHTNESS OF THE ALUMINUM UNDER SAID CHEMICAL ACTION, BY INCORPORATING SILICIC ACID IN SAID BATH.
Claim 2
Independent Claim
69 words
THE METHOD OF BRIGHTENING ALUMINUM WHICH COMPRISES SUBJECTING THE SAME TO A HOT, CONCENTRATED PHOSPHORIC AND NITRIC ACID BRIGHTENING BATH WHICH CONTAINS A MAJOR PROPORTION OF PHOSPHORIC ACID AND A MINOR PROPORTION OF NITRIC ACID, AND INHIBITING THE METAL-DISSOLVING CHEMICAL ACTION OF THE BATH ON THE ALUMINUM RELATIVE TO THE ATTAINMENT OF A DESIRED BRIGHTNESS OF THE ALUMINUM UNDER SAID CHEMICAL ACTION, BY INCORPORATING SILICIC ACID IN SAID BATH.
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) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |