US2470346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcined diatomaceous earth product
Assignee: GREAT LAKES CARBON Corp
•
Filing: 1946-11-12
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Granted: 1949-05-17
•
Expires: 1966-11-12
Abstract
No abstract record available.
Inventors
- 👤 Charles A Frankenhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:31
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/14; B01J21/00; B01J21/16; B01J27/00; B01J27/14; B01J27/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190406725A
Cited
US827887A
Cited
US1482626A
Cited
GB216212A
Cited
US1740351A
Cited
US1981877A
Cited
US2148175A
Cited
US2423686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-16 | 1952-11-15 | 1953-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-16 | 1956-11-15 | 1957-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-16 | 1960-11-15 | 1961-05-17 | $7700.00 | Window Closed / Lapsed |