US2483886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst comprising dispersed alkali metal and carbon black and polymerization process employing said catalyst
Assignee: Phillips Petroleum Co
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Filing: 1946-05-23
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Granted: 1949-10-04
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Expires: 1966-05-23
Abstract
No abstract record available.
Inventors
- 👤 Willie W Crouch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:33
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/20; B01J27/22; C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1227259A
Cited
GB324489A
Cited
US2209746A
Cited
GB537701A
Cited
US2338741A
Cited
US2409519A
Cited
US2394608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-03 | 1953-04-04 | 1953-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-03 | 1957-04-04 | 1957-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-03 | 1961-04-04 | 1961-10-04 | $7700.00 | Window Closed / Lapsed |