US2457232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic conversion system
Assignee: Standard Oil Co
•
Filing: 1944-04-17
•
Granted: 1948-12-28
•
Expires: 1964-04-17
Abstract
No abstract record available.
Inventors
- 👤 Robert J Hengstebeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:29
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; B01J8/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1984380A
Cited
US2270903A
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US2337684A
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US2341193A
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US2304128A
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US2356697A
Cited
US2353731A
Cited
US2433726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |