US3420748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled feedstock division to parallel fractionators
Assignee: Phillips Petroleum Co
•
Filing: 1967-05-25
•
Granted: 1969-01-07
•
Expires: 1987-05-25
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 09:51
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/425; Y; Y10; Y10S; Y10S203/00; Y10S203/19; Y10S208/00; Y10S208/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3224947A
Cited
US3230154A
Cited
US3309287A
Cited
US3322938A
Cited
US3308040A
Cited
US3332856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |