US3193347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of tungstic acid
Assignee: Viridian Inc Canada
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Filing: 1962-06-13
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Granted: 1965-07-06
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Expires: 1982-06-13
Abstract
No abstract record available.
Inventors
- 👤 Frank A Forward
- 👤 Andrew I Vizsolyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/36; C01; C01G; C01G41/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
THE PROCESS FOR THE PRODUCTION OF TENGSTEN ACID SUBSTANTIALLY FREE FROM IMPURITIES WHICH COMPRISES THE STEPS OF: (A) LEACHING A TUNGSTIC ACID CONTAINING MATERIAL WITH A LEACH SOLUTION COMPRISED OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC AND POLYDRIC ALIPHATIC ALCOHOLS WHICH ARE COMPLETELY MISCIBLE IN WATER AT ATMOSPHERIC TEMPERATURE AND WHICH HAVE BOILING POINTS ABOVE 100*C. TO EXTRACT AND DISSOLVE TUNGSTEN VALUES IN THE LEACH SOLUTION: (B) SEPARATING UNDISSOLVED RESIDUE FROM THE LEACH SOLUTION; (C) HYDROLYZING TUNGSTEN DISSOLVED IN THE LEACH SOLUTION IN A HYDROLYSIS STEP IN THE PRESENCE OF WATER PROVIDED IN AMOUNT AT LEAST SUFFICIENTT TO COMBINE WITH DISSOLVED TUNGSTEN TO FORM TUNGSTIC ACID WHEREBY TUNGSTIC ACID SUBSTANTIALLY FREE FROM IMPURITIES IS PRECIPITATED FROM THE LEACH SOLUTION; AND (D) SEPARATING PRECIPITATED TUNGSTIC ACID FROM THE LEACH SOLUTION.
Claim 2
Dependent Claim
132 words
THE PROCESS FOR THE PRODUCTION OF TENGSTEN ACID SUBSTANTIALLY FREE FROM IMPURITIES WHICH COMPRISES THE STEPS OF: (A) LEACHING A TUNGSTIC ACID CONTAINING MATERIAL WITH A LEACH SOLUTION COMPRISED OF AN ALCOHOL SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC AND POLYDRIC ALIPHATIC ALCOHOLS WHICH ARE COMPLETELY MISCIBLE IN WATER AT ATMOSPHERIC TEMPERATURE AND WHICH HAVE BOILING POINTS ABOVE 100*C. TO EXTRACT AND DISSOLVE TUNGSTEN VALUES IN THE LEACH SOLUTION: (B) SEPARATING UNDISSOLVED RESIDUE FROM THE LEACH SOLUTION; (C) HYDROLYZING TUNGSTEN DISSOLVED IN THE LEACH SOLUTION IN A HYDROLYSIS STEP IN THE PRESENCE OF WATER PROVIDED IN AMOUNT AT LEAST SUFFICIENTT TO COMBINE WITH DISSOLVED TUNGSTEN TO FORM TUNGSTIC ACID WHEREBY TUNGSTIC ACID SUBSTANTIALLY FREE FROM IMPURITIES IS PRECIPITATED FROM THE LEACH SOLUTION; AND (D) SEPARATING PRECIPITATED TUNGSTIC ACID FROM THE LEACH SOLUTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |