US2863558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering molten aluminous metal
Assignee: Alcoa Corp
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Filing: 1957-04-29
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Granted: 1958-12-09
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Expires: 1977-04-29
Abstract
No abstract record available.
Inventors
- 👤 Kenneth J Brondyke
- 👤 Philip T Stroup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:41
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/06; C22B21/066
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
THE METHOD OF REMOVING SOLID NON-METALLIC PARTICLES OF IMPURITIES FROM MOLTEN ALUMINOUS METAL COMPRISING THE STEPS OF PROVIDING AN INITIAL BODY OF MOLTEN METAL AT A TEMPERATURE BETWEEN 1200 AND 1400*F. IN A CONTAINER HAVING AN OUTLET ADJACENT THE TOP THEREOF, SAID BODY OF MOLTEN METAL ONLY PARTIALLY FILLING SAID CONTAINER, PREHEATING A MASS OF REFRACTORY GRANULES OF 3 TO 8 MESH IN SIZE TO A TEMPERATURE OF 1200 TO 1500*F., SAID REFRACTORY BEING INERT TOWARDS MOLTEN ALUMINUM AND CONSISTING OF AT LEAST ONE SUBSTANCE SELECTED FROM THE GROUP COMPOSED OF CHROMITE, CORUNDUM, FORSTERITE, MAGNESIA SPINEL, PERI-
References Cited (Backward Citations)
US1040447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |