Patent US4038323A successfully refreshed from Google Patents.
US4038323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkenyl aryl sulfones
Assignee: Rhone Poulenc SA
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Filing: 1973-09-26
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Granted: 1977-07-26
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Expires: 1993-09-26
Abstract
Abstract Carotene compounds e.g. β-carotene, are prepared by reacting a sulphone Ret--SO 2 --R, in which Ret represents retinyl or substituted retinyl and R represents a hydrocarbon radical, in the presence of an alkaline reagent with an ester Ret-X, in which X represents an acid residue, and then desulphonating the product, for example with an alkaline reagent.
Inventors
- 👤 Pierre Chabardes
- 👤 Marc Julia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:54
CPC Classifications
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Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
A retinyl-sulphone of the formula: ##STR6## in which Y is hydrogen or retinyl, and R is alkyl, aryl, alkylaryl, or aralkyl.
Claim 2
Dependent Claim
21 words
A retinyl-sulphone of the formula: ##STR6## in which Y is hydrogen or retinyl, and R is alkyl, aryl, alkylaryl, or aralkyl.
Claim 3
Dependent Claim
15 words
The compound claimed in claim 1 in which R is phenyl and Y is hydrogen.
Claim 4
Dependent Claim
15 words
The compound claimed in claim 1 in which R is phenyl and Y is retinyl.
References Cited (Backward Citations)
US3655620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |