US2398197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ketones in aviation gasoline
Assignee: Shell Development Co
•
Filing: 1943-02-24
•
Granted: 1946-04-09
•
Expires: 1963-02-24
Abstract
No abstract record available.
Inventors
- 👤 Albert L Stanly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:01
CPC Classifications
C; C10; C10L; C10L10/00; C10L10/10; C10L1/00; C10L1/02; C10L1/023; C10L1/10; C10L1/14; C10L1/22; C10L1/222; C10L1/223
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) | 1949-04-08 | 1949-10-08 | 1950-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-04-08 | 1953-10-08 | 1954-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-04-08 | 1957-10-08 | 1958-04-09 | $7700.00 | Window Closed / Lapsed |