Patent US4043937A successfully refreshed from Google Patents.
US4043937A
Expired / Lapsed
US
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Halogen derivatives of ascorbic acid and D-araboascorbic acid antioxidants
Assignee: Hoffmann La Roche Inc
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Filing: 1976-04-28
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Granted: 1977-08-23
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Expires: 1996-04-28
Abstract
Abstract The halogen derivatives of ascorbic acid and D-araboascorbic acid useful as antioxidants as well as a method for stabilizing oxidation-sensitive organic materials by incorporating said derivatives in oxidation sensitive materials.
Inventors
- 👤 Joseph Kiss
- 👤 Klaus Peter Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:39
CPC Classifications
C; C07; C07H; C07H9/00; C07H9/02; C07H9/04; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/62
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
A compound of the tautomeric formulae ##STR7## wherein X is halogen; and one of Y and Z is hydrogen, and the other is hydroxy; with the proviso that when Y is hydroxy and Z is hydrogen, X is chlorine or bromine; a salt of these compounds.
Claim 2
Dependent Claim
46 words
A compound of the tautomeric formulae ##STR7## wherein X is halogen; and one of Y and Z is hydrogen, and the other is hydroxy; with the proviso that when Y is hydroxy and Z is hydrogen, X is chlorine or bromine; a salt of these compounds.
Claim 3
Dependent Claim
15 words
The compound of claim 1 wherein said compound is 6-chloro-6-deoxy-L-ascorbic acid or a salt thereof.
Claim 4
Dependent Claim
15 words
The compound of claim 1 wherein said compound is 6-bromo-6-deoxy-L-ascorbic acid or a salt thereof.
Claim 5
Dependent Claim
15 words
The compound of claim 1 wherein said compound is 6-deoxy-6-fluoro-L-ascorbic acid or a salt thereof.
Claim 6
Dependent Claim
15 words
The compound of claim 1 wherein said compound is 6-deoxy-6-iodo-L-ascorbic acid or a salt thereof.
Claim 7
Dependent Claim
61 words
Process for stabilizing oxidation-sensitive organic materials comprising incorporating in said material a stabilizing amount of a compound of the tautomeric formula: ##STR8## wherein X is halogen; and one of Y and Z is hydrogen and the other is hydroxy; with the proviso that when Y is hydroxy and Z is hydrogen, X is chlorine or bromine; or with a salt thereof.
Claim 8
Dependent Claim
61 words
Process for stabilizing oxidation-sensitive organic materials comprising incorporating in said material a stabilizing amount of a compound of the tautomeric formula: ##STR8## wherein X is halogen; and one of Y and Z is hydrogen and the other is hydroxy; with the proviso that when Y is hydroxy and Z is hydrogen, X is chlorine or bromine; or with a salt thereof.
Claim 9
Dependent Claim
27 words
The process of claim 6 wherein said compound is incorporated in an amount of from 0.001 wt. to 0.1 wt.% based upon the weight of said material.
Claim 10
Dependent Claim
59 words
A mixture comprising a stabilizing amount of a oxidation-sensitive organic material and a compound of the tautomeric formulae ##STR9## wherein X is halogen; and one of Y and Z is hydrogen atom and the other is hydroxy; with the proviso that when Y is hydroxy and Z is hydrogen, X is chlorine or bromine, or with a salt thereof.
Claim 11
Dependent Claim
59 words
A mixture comprising a stabilizing amount of a oxidation-sensitive organic material and a compound of the tautomeric formulae ##STR9## wherein X is halogen; and one of Y and Z is hydrogen atom and the other is hydroxy; with the proviso that when Y is hydroxy and Z is hydrogen, X is chlorine or bromine, or with a salt thereof.
Claim 12
Dependent Claim
25 words
The mixture of claim 8 wherein said compound is present in an amount of from 0.001 to 0.1 wt. of the material to be stabilized.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |