US2490993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst stripping
Assignee: MW Kellogg Co
•
Filing: 1944-05-29
•
Granted: 1949-12-13
•
Expires: 1964-05-29
Abstract
No abstract record available.
Inventors
- 👤 Walter H Borcherding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:33
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18; B; B01; B01J; B01J8/00; B01J8/18; B01J8/1881; B01J8/189
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2289329A
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US2270903A
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GB543838A
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US2420632A
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US2345718A
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US2370816A
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US2302209A
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US2341193A
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US2304128A
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US2367694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |