Patent US3198625A successfully refreshed from Google Patents.
US3198625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aluminum
Assignee: Alcoa Corp
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Filing: 1961-02-08
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Granted: 1965-08-03
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Expires: 1981-02-08
Abstract
No abstract record available.
Inventors
- 👤 Philip T Stroup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:13
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A METHOD OF SELECTIVELY SEPARATING SMALL AMOUNTS OF CERTAIN METALLIC IMPURITIES FROM ALUMINUM, THE IMPURITIES CONSISTING OF AT LEAST ONE OF THE GROUP OF METALS COMPOSED OF TITANIUM, CHROMIUM, VANADIUMAND ZIRCONIUM, THE TOTAL AMOUNT OF SAID IMPURITIES NOT EXCEEDING 0.05%, SAID METHOD COMPRISING MELTING AND HEATING THE IMPURE ALUMINUM TO 1230 TO 1500*F., ADDING BORON THERETO IN THE PROPORTION OF AT LEAST TWO ATOMS OF BORON FOR EACH ATOM OF METALLIC IMPURITY, STIRRING THE MELT WITH THE BORON ADDITION THEREIN, HALTING THE STIRRING AND MAINTAINING THE MELT IN A QUIESCENT CONDITION FOR A PERIOD OF AT LEAST 15 MINUTES WHEREBY SOLID PARTICLES OF A REACTION PRODUCT BETWEEN BORON AND THE METALLIC IMPURITY ARE ALLOWED TO SETTLE, AND THEREAFTER SEPARATING THE LIQUID METAL FROM THE SOLID PARTICLES CONTAINING BORON, SAID LIQUID METAL CONTAINING NOT MORE THAN 0.01% OF BORON.
Claim 2
Independent Claim
138 words
A METHOD OF SELECTIVELY SEPARATING SMALL AMOUNTS OF CERTAIN METALLIC IMPURITIES FROM ALUMINUM, THE IMPURITIES CONSISTING OF AT LEAST ONE OF THE GROUP OF METALS COMPOSED OF TITANIUM, CHROMIUM, VANADIUMAND ZIRCONIUM, THE TOTAL AMOUNT OF SAID IMPURITIES NOT EXCEEDING 0.05%, SAID METHOD COMPRISING MELTING AND HEATING THE IMPURE ALUMINUM TO 1230 TO 1500*F., ADDING BORON THERETO IN THE PROPORTION OF AT LEAST TWO ATOMS OF BORON FOR EACH ATOM OF METALLIC IMPURITY, STIRRING THE MELT WITH THE BORON ADDITION THEREIN, HALTING THE STIRRING AND MAINTAINING THE MELT IN A QUIESCENT CONDITION FOR A PERIOD OF AT LEAST 15 MINUTES WHEREBY SOLID PARTICLES OF A REACTION PRODUCT BETWEEN BORON AND THE METALLIC IMPURITY ARE ALLOWED TO SETTLE, AND THEREAFTER SEPARATING THE LIQUID METAL FROM THE SOLID PARTICLES CONTAINING BORON, SAID LIQUID METAL CONTAINING NOT MORE THAN 0.01% OF BORON.
References Cited (Backward Citations)
US1921998A
Cited
US2974032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |