Patent US2806885A successfully refreshed from Google Patents.
US2806885A
Expired / Lapsed
US
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Preparation of 3, 4-3', 4'-bisdehydro-beta-carotene
Assignee: F Hoffmann La Roche AG
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Filing: 1955-12-15
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Granted: 1957-09-17
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Expires: 1975-12-15
Abstract
No abstract record available.
Inventors
- 👤 Isler Otto
- 👤 Lindlar Herbert
- 👤 Montavon Marc
- 👤 Ruegg Rudolf
- 👤 Zeller Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:51
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/24; C07C403/06; C07C403/08; C07C403/10; C07C403/14; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
11 words
1,18-DI-(2,6,6-TRIMETHYL - 1,3 - CYCLOHEXADIEN-L-YL)3,7,12,16 - TETRAMETHYL - 8,11 - DIHYDROXY-2,4,6,12,14,16OCTADECAHEXAEN-9-YNE.
References Cited (Backward Citations)
US2671112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |