Patent US3408261A successfully refreshed from Google Patents.
US3408261A
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US
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Control system for fractional distillation having a non-linear function generator
Assignee: Phillips Petroleum Co
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Filing: 1965-08-20
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Granted: 1968-10-29
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Expires: 1985-08-20
Abstract
No abstract record available.
Inventors
- 👤 Merion L Johnson
- 👤 Dale E Lupfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:10
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/425; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3227631A
Cited
US3271269A
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US3268420A
Cited
US3271270A
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US3272722A
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US3296097A
Cited
US3259734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |