US2444128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reactivating finely divided contact material
Assignee: Universal Oil Products Co
•
Filing: 1943-08-30
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Granted: 1948-06-29
•
Expires: 1963-08-30
Abstract
No abstract record available.
Inventors
- 👤 Nils K Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:10
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/08; B01J8/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1836301A
Cited
US1943976A
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GB544063A
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US2320273A
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US2311984A
Cited
US2320562A
Cited
US2377935A
Cited
US2401739A
Cited
US2409596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-29 | 1951-12-29 | 1952-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-29 | 1955-12-29 | 1956-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-29 | 1959-12-29 | 1960-06-29 | $7700.00 | Window Closed / Lapsed |