Patent US2809905A successfully refreshed from Google Patents.
US2809905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melting and refining metals
Assignee: National Research Development Corp UK
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Filing: 1956-12-21
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Granted: 1957-10-15
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Expires: 1976-12-21
Abstract
No abstract record available.
Inventors
- 👤 Davis Michael
- 👤 Lever Reginald Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:07
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/30; H01J37/305; C; C30; C30B; C30B13/00; C30B13/08; C30B13/10; C30B13/12; C30B13/16; C30B13/22; C30B29/00; C30B29/10; C30B29/16; C30B29/20; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S117/905; Y10S117/911; Y10S148/00; Y10S148/074; Y10S164/00; Y10S164/04; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/1088; Y10T279/00; Y10T279/17; Y10T279/17128; Y10T279/17136; Y10T279/17153
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A METHOD OF REFINING A REFRACTORY MATERIAL WHICH IS STABLE WHEN MOLTEN AND HAS A NEGLIGIBLE VAPOUR PRESSURE AT ITS MELTING POINT BUT CONTAINS AN IMPURITY OF HIGHER SOLUBILITY IN THE MATERIAL WHEN MOLTEN THAN IN THE MATERIAL IN ITS SOLID STATE, WHICH METHOD COMPRISES THE STEPS OF SUPPORTING A SOLID ROD OF THE MATERIAL IN AN EVACUABLE ENCLOSURE, CONTAINING AN ELECTRON GUN, EVACUATING SAID ENCLOSURE, HEATING THE ROAD OF MATERIAL IN THE EVACUATED CLOSURE BY ELECTRON BOMBARDMENT FROM SAID GUN CONFINED TO A LIMITED ZONE OF THE ROD TO MELT THE MATERIAL AT SAID ZONE WITHOUT CAUSING THE MELT TO RUN FROM THE ROD, AND TRAVERSING SAID ROD AND SAID GUN RELATIVE TO ONE ANOTHER TO MOVE THE MELTED ZONE ALONG THE ROD TO COLLECT IN SAID ZONE THE IMPURITIES SOLUBLE THEREIN AND THEREBY TO TRNASFER THEM TO AN END PORTION OF THE ROD.
Claim 2
Independent Claim
145 words
A METHOD OF REFINING A REFRACTORY MATERIAL WHICH IS STABLE WHEN MOLTEN AND HAS A NEGLIGIBLE VAPOUR PRESSURE AT ITS MELTING POINT BUT CONTAINS AN IMPURITY OF HIGHER SOLUBILITY IN THE MATERIAL WHEN MOLTEN THAN IN THE MATERIAL IN ITS SOLID STATE, WHICH METHOD COMPRISES THE STEPS OF SUPPORTING A SOLID ROD OF THE MATERIAL IN AN EVACUABLE ENCLOSURE, CONTAINING AN ELECTRON GUN, EVACUATING SAID ENCLOSURE, HEATING THE ROAD OF MATERIAL IN THE EVACUATED CLOSURE BY ELECTRON BOMBARDMENT FROM SAID GUN CONFINED TO A LIMITED ZONE OF THE ROD TO MELT THE MATERIAL AT SAID ZONE WITHOUT CAUSING THE MELT TO RUN FROM THE ROD, AND TRAVERSING SAID ROD AND SAID GUN RELATIVE TO ONE ANOTHER TO MOVE THE MELTED ZONE ALONG THE ROD TO COLLECT IN SAID ZONE THE IMPURITIES SOLUBLE THEREIN AND THEREBY TO TRNASFER THEM TO AN END PORTION OF THE ROD.
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) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |