US3425826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of vanadium and columbium (niobium)
Assignee: United States Atomic Energy Commission
•
Filing: 1966-03-21
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Granted: 1969-02-04
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Expires: 1986-03-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Schmidt
- 👤 Oscar N Carlson
- 👤 William E Krupp
- 👤 Harley A Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:28
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/20; C22B34/22; C22B34/24; C22B9/00; C22B9/16; C22B9/22; C22B9/228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3072982A
Cited
US2789896A
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US3078326A
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US3226223A
Cited
US3218154A
Cited
US3184302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |