US2968527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of recovering tungstic acid values from aqueous media
Assignee: Columbia Southern Chemical Corp
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Filing: 1957-10-03
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Granted: 1961-01-17
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Expires: 1977-10-03
Abstract
No abstract record available.
Inventors
- 👤 Paul H Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:21
CPC Classifications
C; C01; C01G; C01G41/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A METHOD OF RECOVERING TUNGSTIC ACID VALUES FROM AQUEOUS MEDIA CONTAINING THE SAME COMPRISES REMOVING TUNGSTIC ACID VALUES FROM THE MEDIA BY CONTACTING IT WITH AN ION-EXCHANGE RESIN, ELUTING THE ION-EXCHANGE RESIN BY CONTACT WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL CHLORIDE AND THEREAFTER PRECIPITATING THE TUNGSTIC ACID VALUES FROM THE AQUEOUS ALKALI METAL CHLORIDE SOLUTION.
Claim 2
Independent Claim
57 words
A METHOD OF RECOVERING TUNGSTIC ACID VALUES FROM AQUEOUS MEDIA CONTAINING THE SAME COMPRISES REMOVING TUNGSTIC ACID VALUES FROM THE MEDIA BY CONTACTING IT WITH AN ION-EXCHANGE RESIN, ELUTING THE ION-EXCHANGE RESIN BY CONTACT WITH AN AQUEOUS SOLUTION OF AN ALKALI METAL CHLORIDE AND THEREAFTER PRECIPITATING THE TUNGSTIC ACID VALUES FROM THE AQUEOUS ALKALI METAL CHLORIDE 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) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |