US2457973A
Expired / Lapsed
US
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Ionizing means and method of ionization
Assignee: INTERNAT RARE METALS REFINERY
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Filing: 1945-08-31
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Granted: 1949-01-04
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Expires: 1965-08-31
Abstract
No abstract record available.
Inventors
- 👤 Blau Marietta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:59
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/10; H01T13/00; H01T13/20; H01T13/22
Claims Analysis
Total Claims: 0
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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) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |