US2816659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating phases by centrifugal force
Assignee: Shell Development Co
•
Filing: 1955-06-20
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Granted: 1957-12-17
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Expires: 1975-06-20
Abstract
No abstract record available.
Inventors
- 👤 Jan J Van Deemter
- 👤 Rietema Kornelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:51
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/06; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0217; B01D17/04; B01D17/042; B04; B04C; B04C5/00; B04C5/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |