US2665975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for countercurrent contact of fluid materials
Assignee: Standard Oil Development Co
•
Filing: 1951-02-10
•
Granted: 1954-01-12
•
Expires: 1971-02-10
Abstract
No abstract record available.
Inventors
- 👤 Ng Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:25
CPC Classifications
B; B01; B01F; B01F23/00; B01F23/40; B01F23/45; B01F23/453; B01D; B01D11/00; B01D11/04; B01D11/0446; B01D11/0473; B01D21/00; B01D21/0039; B01D21/0042; B01D21/02; B01D21/24; B01D21/2405; B01D21/2488
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE585517C
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US2020850A
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US2063789A
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US2192094A
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US2345667A
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US2560072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |