Patent US2424083A successfully refreshed from Google Patents.
US2424083A
Expired / Lapsed
US
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Supported silver catalyst
Assignee: Shell Development Co
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Filing: 1943-08-11
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Granted: 1947-07-15
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Expires: 1963-08-11
Abstract
No abstract record available.
Inventors
- 👤 Harry De V Finch
- 👤 Bergsteinsson Ingolfur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/48; B01J23/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2178454A
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US2245183A
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US2279469A
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US1519470A
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US1937728A
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US1739306A
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US2034077A
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US2113977A
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US2355933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-14 | 1951-01-13 | 1951-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-14 | 1955-01-13 | 1955-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-14 | 1959-01-13 | 1959-07-15 | $7700.00 | Window Closed / Lapsed |