US2245945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of mixtures of isomeric organic compounds
Assignee: Shell Development Co
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Filing: 1939-03-24
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Granted: 1941-06-17
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Expires: 1959-03-24
Abstract
No abstract record available.
Inventors
- 👤 Willem Johannes Dominicu Dijck
- 👤 Schaafsma Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:20
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/70; C07C37/72; C07C201/00; C07C201/06; C07C201/16; C07C41/00; C07C41/01; C07C41/34; C07C41/38; C07C45/00; C07C45/78; C07C45/80; C07C51/00; C07C51/42; C07C51/48
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) | 1944-06-16 | 1944-12-16 | 1945-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-06-16 | 1948-12-16 | 1949-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-06-16 | 1952-12-16 | 1953-06-17 | $7700.00 | Window Closed / Lapsed |