US2853281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionating tower
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1952-03-26
•
Granted: 1958-09-23
•
Expires: 1972-03-26
Abstract
No abstract record available.
Inventors
- 👤 Henry J Hibshman
- 👤 Stephen H Dole
- 👤 Jr Robert J Wimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:08
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/18; B01D3/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR613550A
Cited
US1782735A
Cited
US2091349A
Cited
US2568749A
Cited
BE497599A
Cited
GB682721A
Cited
US2678201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |