US3438749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange method for preparing metal oxide microspheres
Assignee: United States Atomic Energy Commission
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Filing: 1966-10-25
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Granted: 1969-04-15
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Expires: 1986-10-25
Abstract
No abstract record available.
Inventors
- 👤 Frank D Lonadier
- 👤 Willard B Brown
- 👤 Fred C Fushimi
- 👤 Gary L Silver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:13
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; B; B01; B01J; B01J2/00; C01G; C01G56/00; C01G56/004; C01G56/005; C01P; C01P2004/00; C01P2004/30; C01P2004/32
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |