US2933900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionator feed control
Assignee: Phillips Petroleum Co
•
Filing: 1957-10-09
•
Granted: 1960-04-26
•
Expires: 1977-10-09
Abstract
No abstract record available.
Inventors
- 👤 George W Hanthorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:01
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; C; C07; C07C; C07C7/00; C07C7/04; B; B01; B01D; B01D3/00; B01D3/008; B01D3/42; F25J2280/00; F25J2280/02; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2069490A
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US2086808A
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US2357113A
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US2500916A
Cited
US2419529A
Cited
US2386601A
Cited
US2489949A
Cited
DE859153C
Cited
FR1000066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |