Patent US2939293A successfully refreshed from Google Patents.
US2939293A
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Start-up procedure-gas fractionator
Assignee: Phillips Petroleum Co
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Filing: 1958-04-07
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Granted: 1960-06-07
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Expires: 1978-04-07
Abstract
No abstract record available.
Inventors
- 👤 William B Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:56
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0204; F25J3/0219; F25J3/0209; F25J3/0228; F25J3/0233; F25J3/0238; F25J3/0252; F25J3/0261; F25J3/028; F25J3/029; F25J3/0295; F25J3/04; F25J3/044; F25J3/04763; F25J3/04769; F25J3/04812; F25J3/04818; F25J2200/00; F25J2200/74; F25J2200/90; F25J2200/92; F25J2210/00; F25J2210/12; F25J2215/00; F25J2215/62; F25J2245/00; F25J2245/02; F25J2270/00; F25J2270/90; F25J2280/00; F25J2280/10; Y; Y10; Y10S; Y10S203/00; Y10S203/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |