US4000198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxy-acetylene-substituted cyclohexenone
Assignee: Hoffmann La Roche Inc
•
Filing: 1975-06-09
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Granted: 1976-12-28
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Expires: 1995-06-09
Abstract
Abstract A total synthesis of canthaxanthin or dinor-canthaxanthin, known food coloring agents, from pentols.
Inventors
- 👤 Michael Rosenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:04
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/24; C07C403/04; C07C403/06; C07C403/08; C07C403/10; C07C45/00; C07C45/45; C07C45/455; C07C45/51; C07C45/511; C07C45/513; C07C45/61; C07C45/62; C07C45/67; C07C45/68; C07C45/70; C07C45/71; C07C45/72; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5442; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A compound of the formula: ##STR36##
Claim 2
Dependent Claim
6 words
A compound of the formula: ##STR36##
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) | 1979-12-28 | 1980-06-28 | 1980-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-28 | 1984-06-28 | 1984-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-28 | 1988-06-28 | 1988-12-28 | $7700.00 | Window Closed / Lapsed |