US2675393A
Expired / Lapsed
US
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Cyclization process of geranylacetones, in order to obtain a mixture of tetramethyl-2, 5, 5, 9-hexahydrochromenes
Assignee: Givaudan Delawanna Inc
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Filing: 1951-08-29
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Granted: 1954-04-13
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Expires: 1971-08-29
Abstract
No abstract record available.
Inventors
- 👤 Naves Yves Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:09
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
IN THE PROCESS FOR PREPARING TETRAMETHYL2,5,5,9-HEXAHYDRO-CHROMENES, THE IMPROVEMENT WHICH COMPRISES TREATING UNDER ANHYDROUS CONDITIONS GERANYLACETONE WITH BORON TRIFLUORIDE.
Claim 2
Dependent Claim
18 words
IN THE PROCESS FOR PREPARING TETRAMETHYL2,5,5,9-HEXAHYDRO-CHROMENES, THE IMPROVEMENT WHICH COMPRISES TREATING UNDER ANHYDROUS CONDITIONS GERANYLACETONE WITH BORON TRIFLUORIDE.
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) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |