Patent US3208117A successfully refreshed from Google Patents.
US3208117A
Expired / Lapsed
US
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Casting method
Assignee: Stahl- und Rohrenwerk Reisholz GmbH
•
Filing: 1963-03-27
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Granted: 1965-09-28
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Expires: 1983-03-27
Abstract
No abstract record available.
Inventors
- 👤 Goedecke Fritz
- 👤 Opel Paul
- 👤 Olfe Eberhard
- 👤 Martin Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:33
CPC Classifications
B; B22; B22D; B22D1/00; B22D27/00; B22D27/003; B22D27/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A METHOD OF PURIFYING METAL DURING CASTING OF THE SAME, COMPRISING THE STEPS OF POURING A MASS OF MOLTEN METAL INTO A MOLD; INTRODUCING THROUGH THE CENTER PORTION OF THE BOTTOM OF SAID MOLD INTO SAID MASS OF MOLTEN METAL IN SAID MOLD PRIOR TO SOLIDIFICATION THEREOF A FINELY SUBDIVIDED NON-OXIDIZING GAS WHICH IS SUBSTANTIALLY INSOLUBLE IN THE MOLTEN METAL AND SELECTED FROM THE GROUP CONSISTING OF RARE GASES, NITROGEN AND CARBON MONOXIDE, SAID GAS RISING IN FINE BUBBLES THROUGH SAID MASS OF MOLTEN METAL TO THE UPPER SURFACE THEREOF CARRYING ALONG AND THUS REMOVING IMPURITIES FROM THE INTERIOR OF SAID MASS OF MOLTEN METAL; AND ALLOWING SAID MASS OF MOLTEN METAL TO SOLIDIFY IN SAID MOLD.
Claim 2
Independent Claim
117 words
A METHOD OF PURIFYING METAL DURING CASTING OF THE SAME, COMPRISING THE STEPS OF POURING A MASS OF MOLTEN METAL INTO A MOLD; INTRODUCING THROUGH THE CENTER PORTION OF THE BOTTOM OF SAID MOLD INTO SAID MASS OF MOLTEN METAL IN SAID MOLD PRIOR TO SOLIDIFICATION THEREOF A FINELY SUBDIVIDED NON-OXIDIZING GAS WHICH IS SUBSTANTIALLY INSOLUBLE IN THE MOLTEN METAL AND SELECTED FROM THE GROUP CONSISTING OF RARE GASES, NITROGEN AND CARBON MONOXIDE, SAID GAS RISING IN FINE BUBBLES THROUGH SAID MASS OF MOLTEN METAL TO THE UPPER SURFACE THEREOF CARRYING ALONG AND THUS REMOVING IMPURITIES FROM THE INTERIOR OF SAID MASS OF MOLTEN METAL; AND ALLOWING SAID MASS OF MOLTEN METAL TO SOLIDIFY IN SAID MOLD.
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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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |