Patent CA777355A successfully refreshed from Google Patents.
US2983600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifying titanium sponge
Assignee: Dow Chemical Co
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Filing: 1957-10-23
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Granted: 1961-05-09
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Expires: 1977-10-23
Abstract
No abstract record available.
Inventors
- 👤 Robert D Blue
- 👤 George B Cobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:55
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1295; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
THE METHOD OF TREATING A CONTAMINATED SUBGROUP IVA METAL SELECTED FROM THE CLASS CONSISTING OF TITANUM AND ZIROCNIUM AND CONTAINING REDUCING METAL AND HALIDE SALT IMPURITIES WHICH COMPRISES THE STEPS OF: HEATING THE CONTAMINATED METAL IN A CLOSED SYSTEM AT A TEMPERATURE ABOVE THE BOILING POINT OF BOTH THE REDUCING METAL AND THE HALIDE SALT BUT BELOW THE MELTING POINT OF THE SUBGROUP IVA METAL FOR AT LEAST 3 HOURS TO LIQUEFY AND VOLATILIZE THE IMPURITIES WHILE DIRECTING THE FLOW OF INERT GAS DOWNWARDLY THROUGH THE SYSTEM TO SWEEP OUT AND CARRY AWAY THE LIQUEFIED AND VOLATIZED IMPURITIES FROM THE SUBGROUP IVA METAL BEING HEATED, CONTINUOUSLY REMOVING THE IMPURITIES THUS LIQUEFIED AND VOLATIZED FROM THE VICINITY OF THE METAL BEING SO HEATED, COOLING THE SUBGROUP IVA METAL THUS HEATED IN AN ATMOSPHERE COMPRISING AN INERT GAS, FRAGMENTING THE THUS COOLED METAL, SUBJECTING THE FRAGMENTED METAL TO THE LEACHING ACTION OF AN AQUEOUS LIQUID TO CARRY AWAY IN SOLUTION SUBSTAN-
Claim 2
Independent Claim
159 words
THE METHOD OF TREATING A CONTAMINATED SUBGROUP IVA METAL SELECTED FROM THE CLASS CONSISTING OF TITANUM AND ZIROCNIUM AND CONTAINING REDUCING METAL AND HALIDE SALT IMPURITIES WHICH COMPRISES THE STEPS OF: HEATING THE CONTAMINATED METAL IN A CLOSED SYSTEM AT A TEMPERATURE ABOVE THE BOILING POINT OF BOTH THE REDUCING METAL AND THE HALIDE SALT BUT BELOW THE MELTING POINT OF THE SUBGROUP IVA METAL FOR AT LEAST 3 HOURS TO LIQUEFY AND VOLATILIZE THE IMPURITIES WHILE DIRECTING THE FLOW OF INERT GAS DOWNWARDLY THROUGH THE SYSTEM TO SWEEP OUT AND CARRY AWAY THE LIQUEFIED AND VOLATIZED IMPURITIES FROM THE SUBGROUP IVA METAL BEING HEATED, CONTINUOUSLY REMOVING THE IMPURITIES THUS LIQUEFIED AND VOLATIZED FROM THE VICINITY OF THE METAL BEING SO HEATED, COOLING THE SUBGROUP IVA METAL THUS HEATED IN AN ATMOSPHERE COMPRISING AN INERT GAS, FRAGMENTING THE THUS COOLED METAL, SUBJECTING THE FRAGMENTED METAL TO THE LEACHING ACTION OF AN AQUEOUS LIQUID TO CARRY AWAY IN SOLUTION SUBSTAN-
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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) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |