Patent US2888320A successfully refreshed from Google Patents.
US2888320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of extracting and recovering columbium and tantalum values from their ores and products thereof
Assignee: Individual
•
Filing: 1955-12-21
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Granted: 1959-05-26
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Expires: 1975-12-21
Abstract
No abstract record available.
Inventors
- 👤 Andrew T Mccord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:36
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
3. THE PROCESS OF EXTRACTING A PAURE TANTALUM COMPOUND FROM AN AMMONIUM FLUORIDE SOLUTION OF COLUMBIUM AND TANTALUM WHICH COMPRISES TREATING THE SOLUTION WITH A SOLUBLE POTASSIUM SALT TO FORM POTASSIUM FLUOTANTELATE, COOLING TO PRECIPITATE THE POTASSIUM FLUO-TAN-
Claim 2
Dependent Claim
38 words
3. THE PROCESS OF EXTRACTING A PAURE TANTALUM COMPOUND FROM AN AMMONIUM FLUORIDE SOLUTION OF COLUMBIUM AND TANTALUM WHICH COMPRISES TREATING THE SOLUTION WITH A SOLUBLE POTASSIUM SALT TO FORM POTASSIUM FLUOTANTELATE, COOLING TO PRECIPITATE THE POTASSIUM FLUO-TAN-
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-25 | 1962-11-24 | 1963-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-25 | 1966-11-24 | 1967-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-25 | 1970-11-24 | 1971-05-26 | $7700.00 | Window Closed / Lapsed |