US4268265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Natural dyestuffs for gelatine capsules
Assignee: Parke Davis and Co LLC
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Filing: 1979-07-13
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Granted: 1981-05-19
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Expires: 1999-07-13
Abstract
Abstract Process for stabilizing dyestuffs sensitive to light and/or oxidation, especially natural dyestuffs, by adsorption on a highly disperse adsorbent, whereby the dyestuff is immobilized, as well as the application of the process to dyestuffs which are determined for dyeing medicines, for instance gelatine capsules for medicinal purposes, cosmetics, food stuffs and animal feed.
Inventors
- 👤 Andre R. Von Wattenwyl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:29
CPC Classifications
C; C09; C09B; C09B61/00; C09B67/00; C09B63/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A process for stabilizing a natural dyestuff for gelatine capsules against degradation by light or oxidation which comprises A. dissolving said dyestuff in a suitable solvent; B. contacting the resulting dyestuff solution with a finely divided adsorbent and immobilizing said dyestuff on said adsorbent thereby stabilizing said dyestuff; C. separating the resulting stabilized dyestuff from said solution; and D. drying said stabilized dyestuff and E. adding said stabilized dyestuff into gelatin for capsules.
Claim 2
Dependent Claim
73 words
A process for stabilizing a natural dyestuff for gelatine capsules against degradation by light or oxidation which comprises A. dissolving said dyestuff in a suitable solvent; B. contacting the resulting dyestuff solution with a finely divided adsorbent and immobilizing said dyestuff on said adsorbent thereby stabilizing said dyestuff; C. separating the resulting stabilized dyestuff from said solution; and D. drying said stabilized dyestuff and E. adding said stabilized dyestuff into gelatin for capsules.
Claim 3
Dependent Claim
128 words
A process according to claim 1 for stabilizing a natural dyestuff for gelatine capsules which comprises A. dissolving said dyestuff in a physiologically compatible or readily volatile solvent selected from the group consisting of water, alcohol, diethylether, tetrachloroethylene, and acetone in a concentration from about 0.1% to about 10% by weight of said solvent; B. contacting the resulting dyestuff solution with an adsorbent of particle size from about 1 to about 100 millimicrons selected from the group consisting of carbonates, silicates, hydroxides, and oxides of groups II, III, IV of the periodic table of the elements, cellulose, starches, alginates, polyamides, and polyacrylates in an amount from about 1% to about 10% by weight of the solvent at about room temperature and pH of about 3 to about 10.
Claim 4
Dependent Claim
46 words
The process according to claim 1 which comprises adding an adsorption promoter selected from the group consisting of alkali metal halide, alkali metal sulfates, alkali metal phosphates, to said dyestuff solution in an amount of from about 1% to about 10% by weight of said adsorbent.
Claim 5
Dependent Claim
17 words
The process according to claim 1 or 3 which comprises adding an antioxidant to said dyestuff solution.
Claim 6
Dependent Claim
41 words
The process according to claim 4 which comprises adding an antioxidant selected from the group consisting of tocopherol, 6-ethoxy-1,2-dihydro-2,2,4-trimethylquinoline, and ascorbyl palmitate to said dyestuff solution in an amount of from about 0.01% to about 10% by weight of said dyestuff.
Claim 7
Dependent Claim
14 words
A stabilized natural dyestuff for gelatine capsules prepared by the process of claim 1.
Claim 8
Dependent Claim
14 words
A process for dyeing gelatine capsules using the stabilized natural dyestuff of claim 6.
Claim 9
Dependent Claim
13 words
Dyed gelatine capsules prepared by using the stabilized natural dyestuff of claim 6.
References Cited (Backward Citations)
US1303426A
Cited
US1337673A
Cited
FR1291155A
Cited
BE715809A
Cited
US4082660A
Cited
FR2299385B1
Cited
DE2802789C3
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |