Patent US4707998A successfully refreshed from Google Patents.
US2369734A
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Catalytic conversion process
Assignee: Standard Oil Co
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Filing: 1942-02-28
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Granted: 1945-02-20
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Expires: 1962-02-28
Abstract
No abstract record available.
Inventors
- 👤 Heard Llewellyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:04
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-02-20 | 1948-08-21 | 1949-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-02-20 | 1952-08-21 | 1953-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-02-20 | 1956-08-21 | 1957-02-20 | $7700.00 | Window Closed / Lapsed |