US2154713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extracting ethereal oils
Assignee: Shell Development Co
•
Filing: 1937-03-08
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Granted: 1939-04-18
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Expires: 1957-03-08
Abstract
No abstract record available.
Inventors
- 👤 Willem Rhijnvis Van Wijk
- 👤 Willem Johannes Dominicu Dijck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:45
CPC Classifications
C; C11; C11B; C11B9/00; C11B9/02; C11B9/025; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0446; B01D11/0457; B01D11/0488
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) | 1942-04-17 | 1942-10-17 | 1943-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-17 | 1946-10-17 | 1947-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-17 | 1950-10-17 | 1951-04-18 | $7700.00 | Window Closed / Lapsed |