US2139871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for contacting two liquids
Assignee: Standard Oil Co
•
Filing: 1937-08-06
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Granted: 1938-12-13
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Expires: 1957-08-06
Abstract
No abstract record available.
Inventors
- 👤 Roy R Wilson
- 👤 Ernest K Brown
- 👤 Frank L White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:57
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0426; B01D11/0434; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/554; Y10T70/5562; Y10T70/5575; Y10T70/558; Y10T70/5584
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) | 1941-12-12 | 1942-06-13 | 1942-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-12-12 | 1946-06-13 | 1946-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-12-12 | 1950-06-13 | 1950-12-13 | $7700.00 | Window Closed / Lapsed |