US3197340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and method for cleaning aluminum castings
Assignee: Conversion Chemical Corp
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Filing: 1960-10-05
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Granted: 1965-07-27
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Expires: 1980-10-05
Abstract
No abstract record available.
Inventors
- 👤 Kenneth P Bellinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:56
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/12; C23G1/125
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE METHOD OF CLEANING ALUMINUM CASTINGS COMPRISING IMMERSING CASTINGS OF ALUMINUM ALLOY HAVING AN ALLOYING ELEMENT INSOLUBLE IN ALKALI IN A HIGHLY ALKALINE BATH TO ETCH A PORTION OF THE SURFACE AND PRODUCE A DARK SMUT THEREON COMPRISED OF THE ALKALI-INSOLUBLE ALLOYING ELEMENT; AND THEREAFTER IMMERSING SAID CASTINGS IN A CONCENTRATED ACID BATH CONTAINING 1-45 PERCENT BY WEIGHT HYDROFLUORIC ACID, 30-98 PERCENT BY WEIGHT NITRIC ACID, 0.05-10.0 PERCENT BY WEIGHT HEXAVALENT CHROMIUM ION (CALCULATED AS CR) AND NOT MORE THAN 30 PERCENT BY WEIGHT WATER, FOR A PERIOD OF TIME SUFFICIENT TO IMPART A WHITE SURFACE THERETO.
Claim 2
Independent Claim
97 words
THE METHOD OF CLEANING ALUMINUM CASTINGS COMPRISING IMMERSING CASTINGS OF ALUMINUM ALLOY HAVING AN ALLOYING ELEMENT INSOLUBLE IN ALKALI IN A HIGHLY ALKALINE BATH TO ETCH A PORTION OF THE SURFACE AND PRODUCE A DARK SMUT THEREON COMPRISED OF THE ALKALI-INSOLUBLE ALLOYING ELEMENT; AND THEREAFTER IMMERSING SAID CASTINGS IN A CONCENTRATED ACID BATH CONTAINING 1-45 PERCENT BY WEIGHT HYDROFLUORIC ACID, 30-98 PERCENT BY WEIGHT NITRIC ACID, 0.05-10.0 PERCENT BY WEIGHT HEXAVALENT CHROMIUM ION (CALCULATED AS CR) AND NOT MORE THAN 30 PERCENT BY WEIGHT WATER, FOR A PERIOD OF TIME SUFFICIENT TO IMPART A WHITE SURFACE THERETO.
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) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |