US2760993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of menthol from mint oils by chromatogrphic adsorption
Assignee: IOWA STATE COLLEGE RES FOUND
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Filing: 1951-07-25
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Granted: 1956-08-28
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Expires: 1971-07-25
Abstract
No abstract record available.
Inventors
- 👤 Hson M Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:31
CPC Classifications
C; C07; C07C; C07C35/00; C07C35/02; C07C35/08; C07C35/12
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) | 1959-08-28 | 1960-02-27 | 1960-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-28 | 1964-02-27 | 1964-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-28 | 1968-02-27 | 1968-08-28 | $7700.00 | Window Closed / Lapsed |