US2625468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of conditioning brightening baths
Assignee: Motors Liquidation Co
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Filing: 1951-05-03
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Granted: 1953-01-13
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Expires: 1971-05-03
Abstract
No abstract record available.
Inventors
- 👤 Stanley R Prance
- 👤 Harold J Reindl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:28
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN THE METHOD FOR BRIGHTENING ALUMINUM AND ALUMINUM ALLOY PARTS IN A CHEMICAL BATH AND SIMULTANEOUSLY MAINTAINING THE EFFECTIVENESS OF THE BATH WHEREIN THE BATH CONSISTS ESSENTIALLY OF AN AQUEOUS SOLUTION OF NITRIC ACID TOGETHER WITH THE IONS OF AMMONIUM AND FLUORIDE, A METAL AND CHROMIC ACID AND A CARBOHYDRATE, THE STEPS COMPRISING; DIPPING ALUMINUM AND/OR ALUMINUM ALLOY PARTS INTO SAID BATH FOR BRIGHTENING THE SURFACE OF SAID PARTS, REMOVING BETWEEN .004 AND .01 OF A GALLON PER GALLON OF SAID BRIGHTENING BATH FOR EACH SQUARE FOOT OF ALUMINUM AND/OR ALUMINUM ALLOY TREATED THEREIN, AND ADDING NEW SOLUTION OF THE SAME COMPOSITION AS THE INITIAL BATH IN EQUAL QUANTITY TO THE REMOVAL, WHEREBY THE BRIGHTENING ACTION OF THE BATH IS MAINTAINED SUBSTANTIALLY CONSTANT.
Claim 2
Dependent Claim
123 words
IN THE METHOD FOR BRIGHTENING ALUMINUM AND ALUMINUM ALLOY PARTS IN A CHEMICAL BATH AND SIMULTANEOUSLY MAINTAINING THE EFFECTIVENESS OF THE BATH WHEREIN THE BATH CONSISTS ESSENTIALLY OF AN AQUEOUS SOLUTION OF NITRIC ACID TOGETHER WITH THE IONS OF AMMONIUM AND FLUORIDE, A METAL AND CHROMIC ACID AND A CARBOHYDRATE, THE STEPS COMPRISING; DIPPING ALUMINUM AND/OR ALUMINUM ALLOY PARTS INTO SAID BATH FOR BRIGHTENING THE SURFACE OF SAID PARTS, REMOVING BETWEEN .004 AND .01 OF A GALLON PER GALLON OF SAID BRIGHTENING BATH FOR EACH SQUARE FOOT OF ALUMINUM AND/OR ALUMINUM ALLOY TREATED THEREIN, AND ADDING NEW SOLUTION OF THE SAME COMPOSITION AS THE INITIAL BATH IN EQUAL QUANTITY TO THE REMOVAL, WHEREBY THE BRIGHTENING ACTION OF THE BATH IS MAINTAINED SUBSTANTIALLY CONSTANT.
References Cited (Backward Citations)
US2378052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |