Patent JPS5713293A successfully refreshed from Google Patents.
Patent US2288281A successfully refreshed from Google Patents.
US2288281A
Expired / Lapsed
US
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Process for separating mixtures of chemically related substances
Assignee: Shell Development Co
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Filing: 1939-05-29
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Granted: 1942-06-30
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Expires: 1959-05-29
Abstract
No abstract record available.
Inventors
- 👤 Huijser Hendrik Willem
- 👤 Schaafsma Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:21
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/80; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0488; B01F; B01F21/00; C07C319/00; C07C319/26; C07C319/28; C07C45/85; C07C51/00; C07C51/42; C07C51/48; C10; C10G; C10G21/00; C10G21/02; C10G21/04
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) | 1945-06-29 | 1945-12-29 | 1946-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-06-29 | 1949-12-29 | 1950-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-06-29 | 1953-12-29 | 1954-06-30 | $7700.00 | Window Closed / Lapsed |