US3544428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon fractionation column having plural flashing and stripping sections
Assignee: Universal Oil Products Co
•
Filing: 1968-12-30
•
Granted: 1970-12-01
•
Expires: 1988-12-30
Abstract
No abstract record available.
Inventors
- 👤 Marvin E Mellbom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:11
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2085422A
Cited
US2897147A
Cited
US2952632A
Cited
US3110663A
Cited
US3308060A
Cited
US3314879A
Cited
US3412016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |