US2431243A
Expired / Lapsed
US
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Conversion of hydrocarbon oils
Assignee: Shell Development Co
•
Filing: 1946-12-02
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Granted: 1947-11-18
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Expires: 1966-12-02
Abstract
No abstract record available.
Inventors
- 👤 Bernard S Greensfelder
- 👤 Hervey H Voge
- 👤 George M Good
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:51
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/12
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) | 1950-11-17 | 1951-05-19 | 1951-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-17 | 1955-05-19 | 1955-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-17 | 1959-05-19 | 1959-11-18 | $7700.00 | Window Closed / Lapsed |