Patent US2581291A successfully refreshed from Google Patents.
Patent US2469989A successfully refreshed from Google Patents.
US2469989A
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Process of forming chemical reaction products of metal oxides
Assignee: MW Kellogg Co
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Filing: 1944-08-19
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Granted: 1949-05-10
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Expires: 1964-08-19
Abstract
No abstract record available.
Inventors
- 👤 Pyzel Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:25
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/44; C04B7/45
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US371715A
Cited
US1557873A
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US1536702A
Cited
US1746294A
Cited
US1828270A
Cited
US2300042A
Cited
US2409707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |