US2425535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of normal paraffins from iso-paraffins by means of activated cocoanut charcoal
Assignee: Standard Oil Development Co
•
Filing: 1945-07-25
•
Granted: 1947-08-12
•
Expires: 1965-07-25
Abstract
No abstract record available.
Inventors
- 👤 Henry J Hibshman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:26
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; B; B01; B01D; B01D53/00; B01D53/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1412954A
Cited
US1678298A
Cited
GB208569A
Cited
GB205868A
Cited
US1872080A
Cited
US2376425A
Cited
US2384311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |