Patent US2491618A successfully refreshed from Google Patents.
US2491618A
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Catalytic contacting apparatus
Assignee: Standard Oil Co
•
Filing: 1943-07-30
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Granted: 1949-12-20
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Expires: 1963-07-30
Abstract
No abstract record available.
Inventors
- 👤 Edgar J Luetzelschwab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:32
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; B; B01; B01J; B01J19/00; B01J19/26; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00081; B01J2219/00085; B01J2219/18; B01J2219/182; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/054
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US965822A
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US1226379A
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US1816528A
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US1794336A
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US1960770A
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US2060936A
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US2266019A
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US2220092A
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US2246703A
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US2322482A
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US2238802A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |