Patent US2988894A successfully refreshed from Google Patents.
US2988894A
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US
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Fractionation operation
Assignee: Phillips Petroleum Co
•
Filing: 1959-07-17
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Granted: 1961-06-20
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Expires: 1979-07-17
Abstract
No abstract record available.
Inventors
- 👤 Joe Van Pool
- 👤 Howard R Sharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:02
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/42; B01D3/4211; B01D3/4216
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2022809A
Cited
US2464631A
Cited
US2690989A
Cited
US2760352A
Cited
US2775103A
Cited
US2933901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |