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Patent US2987471A successfully refreshed from Google Patents.
US2987471A
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US
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Separation of hydrocarbons
Assignee: Shell USA Inc
•
Filing: 1956-11-19
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Granted: 1961-06-06
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Expires: 1976-11-19
Abstract
No abstract record available.
Inventors
- 👤 Frank T Eggertsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:36
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/02; C10G25/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2306610A
Cited
US2586889A
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US2651603A
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US2818455A
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US2889893A
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US2818137A
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US2834429A
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US2866835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |