US2474007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for contacting fluids
Assignee: Shell Development Co
•
Filing: 1945-06-21
•
Granted: 1949-06-21
•
Expires: 1965-06-21
Abstract
No abstract record available.
Inventors
- 👤 Russel L Maycock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:57
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0426; B01D11/0434; B01D11/0484
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US306040A
Cited
US1081241A
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US1374499A
Cited
US1949696A
Cited
US2092249A
Cited
US2054529A
Cited
US2151126A
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US2244902A
Cited
US2308751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |