US2537459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of pure hydrocarbons by extractive distillation
Assignee: Individual
•
Filing: 1946-02-05
•
Granted: 1951-01-09
•
Expires: 1966-02-05
Abstract
No abstract record available.
Inventors
- 👤 Griswold John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:12
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2113965A
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US2408947A
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US2288126A
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US2325379A
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US2350256A
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US2415006A
Cited
US2426705A
Cited
US2361493A
Cited
US2357028A
Cited
US2432424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |