US3173754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of molybdenum from tungsten values
Assignee: Union Carbide Corp
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Filing: 1962-09-19
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Granted: 1965-03-16
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Expires: 1982-09-19
Abstract
No abstract record available.
Inventors
- 👤 Charles R Kurtak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:29
CPC Classifications
C; C01; C01G; C01G41/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A PROCESS FOR SELECTIVELY SEPARATING MOLYBDENUM FROM A MOLYBDENUM-CONTAMINATED AQUEOUS SOLUTION OF TUNGSTEN VALUES COMPRISING PROVIDING A MOLYBDENUMCONTAMINATED AQUEOUS SOLUTION OF TUNGSTEN VALUES; ADJUSTING THE PH OF SAID SOLUTION TO AT LEAST 8; ADDING TO SAID SOLUTION AT LEAST 170 PERCENT OF THE AMOUNT OF ALKALI SULFIDE STOICHIOMETRICALLY REQUIRED TO CONVERT THE MOLYBDENUM CONTAMINANT IN SAID SOLUTION TO THE THIOMOLYBDATE COMPLEX ION; DIGESTING SAID SOLUTION AT ELEVATED TEMPERATURE TO CONVERT THE MOLYBDENUM CONTAMINANT TO THE THIOMOLYBDATE COMPLEX ION; ACIDIFYING SAID SOLUTION TO A PH BELOW ABOUT 3.0 WHEREBY THE MOLYBDENUM CONTAMINANT IS PRECIPITATED; AND SEPARATING THE PRECIPITATE FROM THE AQUEOUS SOLUTION OF TUNGSTEN VALUES.
Claim 2
Dependent Claim
104 words
A PROCESS FOR SELECTIVELY SEPARATING MOLYBDENUM FROM A MOLYBDENUM-CONTAMINATED AQUEOUS SOLUTION OF TUNGSTEN VALUES COMPRISING PROVIDING A MOLYBDENUMCONTAMINATED AQUEOUS SOLUTION OF TUNGSTEN VALUES; ADJUSTING THE PH OF SAID SOLUTION TO AT LEAST 8; ADDING TO SAID SOLUTION AT LEAST 170 PERCENT OF THE AMOUNT OF ALKALI SULFIDE STOICHIOMETRICALLY REQUIRED TO CONVERT THE MOLYBDENUM CONTAMINANT IN SAID SOLUTION TO THE THIOMOLYBDATE COMPLEX ION; DIGESTING SAID SOLUTION AT ELEVATED TEMPERATURE TO CONVERT THE MOLYBDENUM CONTAMINANT TO THE THIOMOLYBDATE COMPLEX ION; ACIDIFYING SAID SOLUTION TO A PH BELOW ABOUT 3.0 WHEREBY THE MOLYBDENUM CONTAMINANT IS PRECIPITATED; AND SEPARATING THE PRECIPITATE FROM THE AQUEOUS SOLUTION OF TUNGSTEN VALUES.
References Cited (Backward Citations)
US2339888A
Cited
US2556255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |