US2250976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for countercurrent contact of two immiscible liquids
Assignee: Shell Development Co
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Filing: 1936-02-15
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Granted: 1941-07-29
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Expires: 1956-02-15
Abstract
No abstract record available.
Inventors
- 👤 Willem Johannes Dominicu Dijck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:26
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/02; C10G21/04; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0426; B01D11/043; B01D11/0488; C07; C07C; C07C37/00; C07C37/005; C07C37/007; C07C37/68; C07C37/70; C07C37/72; C07C51/00; C07C51/42; C07C51/48; C07C67/00; C07C67/48; C07C67/58
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-07-28 | 1945-01-27 | 1945-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-28 | 1949-01-27 | 1949-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-28 | 1953-01-27 | 1953-07-29 | $7700.00 | Window Closed / Lapsed |