Patent US2491752A successfully refreshed from Google Patents.
US2491752A
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Apparatus and method for polymerizing olefins
Assignee: Standard Oil Development Co
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Filing: 1945-11-15
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Granted: 1949-12-20
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Expires: 1965-11-15
Abstract
No abstract record available.
Inventors
- 👤 James E Moise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:43
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01J19/1868; B01J19/1875; B01J3/00; B01J3/02; B01J4/00; B01J4/001; C; C08; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/10; C08F210/12; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1990113A
Cited
US2360632A
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US2273158A
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US2324195A
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US2408128A
Cited
US2399672A
Cited
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 |