Patent US3239899A successfully refreshed from Google Patents.
US3239899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating metals from alloys
Assignee: Individual
•
Filing: 1962-05-04
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Granted: 1966-03-15
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Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:10
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
THE PROCESS OF CONTINUOUSLY SEPARATING PURE ALUMINUM FROM A FLOWING STREAM OF MOLTEN ALLOY OF ALUMINUM CONTAINING IN SOLUTION ANOTHER METAL WHICH LOWERS ITS FREEZING POINT WHICH COMPRISES MIXING INTO THE MOLTEN ALLOY CRYSTAL GRAINS OF ALUMINUM, FREEZING PURE ALUMINUM OUT OF THE ALLOY ON THE CRYSTAL GRAINS WHICH ARE THEREBY ENLARGED, AND CONTINUOUSLY SEPARATING THE ENLARGED
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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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |