US2421664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contacting fluids with solid particles
Assignee: Standard Oil Development Co
•
Filing: 1940-12-28
•
Granted: 1947-06-03
•
Expires: 1960-12-28
Abstract
No abstract record available.
Inventors
- 👤 Charles W Tyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:02
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1845; B01J8/1863
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1497751A
Cited
US1799858A
Cited
DE533037C
Cited
US2231424A
Cited
US2239801A
Cited
US2273075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |