Patent US2801915A successfully refreshed from Google Patents.
US2801915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of metal compounds in the presence of sulphur
Assignee: Union Carbide Corp
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Filing: 1952-03-18
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Granted: 1957-08-06
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Expires: 1972-03-18
Abstract
No abstract record available.
Inventors
- 👤 Erasmus Hendrik De Wet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:25
CPC Classifications
C; C22; C22B; C22B34/00; C22B60/00; C22B60/02; C22B60/0291
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A PROCESS FOR THE RECOVERY OF METAL BY REDUCING A METALLIC COMPOUND SELCTED FROM THE GROUP CONSISITING OF METAL OXIDES AND METAL SULPHIDES, WHERE SAID METAL IS SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZIRCONIUM, HAFNIUN, COLUMBIUM CHROMIUN AND, THORIUM, COMPRISING REACTING SAID METALLIC COMPOUND IN THE PRESENT OF SULPHUR AND IN A CLOSED REACTION VESSEL WITH A QUANTITY OF CALCIUM METAL AT LEAST EQUAL TO THE STOICHIOMETRIC QUANTITY REQUIRED TO REACT WITH SAID METALLIC COMPOUND AND SAID SULPHUR.
Claim 2
Dependent Claim
79 words
A PROCESS FOR THE RECOVERY OF METAL BY REDUCING A METALLIC COMPOUND SELCTED FROM THE GROUP CONSISITING OF METAL OXIDES AND METAL SULPHIDES, WHERE SAID METAL IS SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZIRCONIUM, HAFNIUN, COLUMBIUM CHROMIUN AND, THORIUM, COMPRISING REACTING SAID METALLIC COMPOUND IN THE PRESENT OF SULPHUR AND IN A CLOSED REACTION VESSEL WITH A QUANTITY OF CALCIUM METAL AT LEAST EQUAL TO THE STOICHIOMETRIC QUANTITY REQUIRED TO REACT WITH SAID METALLIC COMPOUND AND SAID SULPHUR.
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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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |