Patent FR933949A successfully refreshed from Google Patents.
Patent US3188200A successfully refreshed from Google Patents.
US3188200A
Expired / Lapsed
US
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Method of purifying refractory metals
Assignee: Wyandotte Chemicals Corp
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Filing: 1962-05-21
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Granted: 1965-06-08
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Expires: 1982-05-21
Abstract
No abstract record available.
Inventors
- 👤 James A Brothers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:27
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; B; B22; B22F; B22F1/00; B22F1/14; B22F1/145; C; C22; C22B; C22B34/00; C22B34/20; C22B34/24; C22B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A PROCESS FOR THE PURIFICATION OF OXYGEN-CONTAMINATED REFRACTORY METALS WHICH COMPRISES CONTACTING FINELY DIVIDED PARTICLES OF AN OXYGEN-CONTAMINTED REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF NIOBIUM, MOLYBENUM, TUNGSTEN, AND VANADIUM WITH A MIXTURE OF HYDROGEN CHLORIDE GAS AND A GAS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN , ARGON, AND HELIUM, AND MIXTURES THEREOF IN A REATED REACTION ZONE.
Claim 2
Dependent Claim
60 words
A PROCESS FOR THE PURIFICATION OF OXYGEN-CONTAMINATED REFRACTORY METALS WHICH COMPRISES CONTACTING FINELY DIVIDED PARTICLES OF AN OXYGEN-CONTAMINTED REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF NIOBIUM, MOLYBENUM, TUNGSTEN, AND VANADIUM WITH A MIXTURE OF HYDROGEN CHLORIDE GAS AND A GAS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN , ARGON, AND HELIUM, AND MIXTURES THEREOF IN A REATED REACTION ZONE.
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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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |