Patent US2922710A successfully refreshed from Google Patents.
US2922710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of refractory metals
Assignee: EIDP Inc
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Filing: 1957-02-19
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Granted: 1960-01-26
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Expires: 1977-02-19
Abstract
No abstract record available.
Inventors
- 👤 Henry S Dombrowski
- 👤 Jr Charles H Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:01
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; C22B34/10; C22B34/12; C22B34/1263; C22B34/1268; C22B34/1272; C22B5/00; C22B5/02; C22B5/04; C22B5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN THE PRODUCTION OF A REFRACTORY METAL OF GROUPS IV AND V OF THE PERIODIC TABLE INVOLVING THE CHEMICAL REDUCTION OF A HALIDE OF SAID REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF THE CHLORIDES, BROMIDES, AND IODIDES WITH A REDUCING METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM AND MAGNESIUM, FOLLOWED BY DRAINING OF MOLTEN BY-PRODUCT SALT AND AQUEOUS LEACHING TO REMOVE RESIDUAL SOLUBLE MATERIAL THE IMPROVEMENT WHICH COMPRISES, PRIOR TO LEACHING, HEATING THE DRAINED, CRUDE METAL IN PARTICULATE FORM AT LEAST TO THE BOILING POINT OF THE BY-PRODUCT SALT AND BELOW THE MELTING POINT OF THE REFRACTORY METAL FOR A PERIOD OF FROM ABOUT 1-10 MINUTES IN AN INERT ATMOSPHERE AND OUT OF CONTACT WITH HOT CONDUCTIVE-HEATING SURFACES AND THEN COOLING SAID METAL.
Claim 2
Dependent Claim
125 words
IN THE PRODUCTION OF A REFRACTORY METAL OF GROUPS IV AND V OF THE PERIODIC TABLE INVOLVING THE CHEMICAL REDUCTION OF A HALIDE OF SAID REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF THE CHLORIDES, BROMIDES, AND IODIDES WITH A REDUCING METAL SELECTED FROM THE GROUP CONSISTING OF SODIUM AND MAGNESIUM, FOLLOWED BY DRAINING OF MOLTEN BY-PRODUCT SALT AND AQUEOUS LEACHING TO REMOVE RESIDUAL SOLUBLE MATERIAL THE IMPROVEMENT WHICH COMPRISES, PRIOR TO LEACHING, HEATING THE DRAINED, CRUDE METAL IN PARTICULATE FORM AT LEAST TO THE BOILING POINT OF THE BY-PRODUCT SALT AND BELOW THE MELTING POINT OF THE REFRACTORY METAL FOR A PERIOD OF FROM ABOUT 1-10 MINUTES IN AN INERT ATMOSPHERE AND OUT OF CONTACT WITH HOT CONDUCTIVE-HEATING SURFACES AND THEN COOLING SAID METAL.
References Cited (Backward Citations)
US2290338A
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US2355954A
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US2482127A
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US2773760A
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GB717930A
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US2778726A
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GB720517A
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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) | 1963-01-25 | 1963-07-27 | 1964-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-25 | 1967-07-27 | 1968-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-25 | 1971-07-27 | 1972-01-26 | $7700.00 | Window Closed / Lapsed |