Patent US2213808A successfully refreshed from Google Patents.
US2213808A
Expired / Lapsed
US
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Process and apparatus for clarifying liquids
Assignee: Shell Development Co
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Filing: 1938-03-19
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Granted: 1940-09-03
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Expires: 1958-03-19
Abstract
No abstract record available.
Inventors
- 👤 Stietz George E G Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:46
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/0018; B01D11/00; B01D11/04; B01D11/0488; B01D21/10; B01D21/24; B01D21/2405; B01D21/2427; B01D21/2444; B01D21/245; B01D21/30; B01D21/32; B01D2221/00; B01D2221/06
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) | 1943-09-03 | 1944-03-04 | 1944-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-03 | 1948-03-04 | 1948-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-03 | 1952-03-04 | 1952-09-03 | $7700.00 | Window Closed / Lapsed |