US4475919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colored medicinal tablet, natural color pigment and method for using the pigment in coloring food, drug and cosmetic products
Assignee: Colorcon Inc
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Filing: 1982-01-06
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Granted: 1984-10-09
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Expires: 2002-01-06
Abstract
Abstract A pharmaceutical tablet consists of a substrate containing a medicament and may be covered with a coating, said coating including a pigment comprising a natural water insoluble edible powder dyed with an edible natural dye. The pigment for coloring the tablet, or other pharmaceutical products, as well as food and cosmetics, is made by suspending a natural water insoluble edible powdered substrate in an aqueous vehicle and dyeing the suspended powdered substrate with an edible natural dye. The liquid is removed to obtain the dry pigment powder of the invention which then can be suspended in a suspending medium and used for coating products to be colored such as food, drug and cosmetic products.
Inventors
- 👤 Edward J. Woznicki
- 👤 Lawrence J. Rosania
- 👤 Keith Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:36
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; A61K9/2806; A61K9/2833; A61K9/286; A61K9/2866
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
58 words
A method of making an edible natural dye pigment for coloring food, drug and cosmetic products comprising: suspending a natural water insoluble edible powdered substrate in an aqueous liquid, dyeing the suspended powder with an edible natural dye and a dyeing aid or fixing agent, and removing the liquid to obtain the dyed powder as a dry powder.
Claim 2
Independent Claim
58 words
A method of making an edible natural dye pigment for coloring food, drug and cosmetic products comprising: suspending a natural water insoluble edible powdered substrate in an aqueous liquid, dyeing the suspended powder with an edible natural dye and a dyeing aid or fixing agent, and removing the liquid to obtain the dyed powder as a dry powder.
Claim 3
Dependent Claim
14 words
The method in accordance with claim 1 in which the suspended powder is cellulose.
Claim 4
Dependent Claim
14 words
The method in accordance with claim 1 in which the suspended powder is starch.
Claim 5
Dependent Claim
23 words
The method in accordance with claim 1 in which the dye is circumin and the dyeing aid is a water soluble metallic salt.
Claim 6
Dependent Claim
23 words
The method in accordance with claim 1 in which the dye is turmeric, and the dyeing aid is a water soluble metallic salt.
Claim 7
Dependent Claim
16 words
The method in accordance with claim 1 in which the dye is water soluble annatto powder.
Claim 8
Dependent Claim
15 words
The method in accordance with claim 1 in which the dye is grape skin extract.
Claim 9
Dependent Claim
186 words
The method of claim 1, said powder being water insoluble powders of cellulose, microcrystalline cellulose, cellulose derivatives, ethyl cellulose, starch or starch derivatives, the particle size of the powder particles being in the range of about 1 to 50 microns, the amount of the powder being about 2% to 15% (W/V) of the amount of the water, the edible natural dye being curcumin, turmeric, or an anthocyanin such as those contained in commercial grape skin extract, mixing said dyeing aid or fixing agent into the powder suspension to fix the dye onto the powder particles, adding the dye to the powder suspension slowly while stirring the powder suspension, continuing the stirring after all the dye has been added for a sufficient period of time to fix the dye to the powder, filtering the suspension to recover the dyed powder, washing the dyed powder with water and drying it to obtain the natural dye pigment having a particle size in the range of about 1 to 50 microns, said drying being carried out in a mechanical convection oven at a temperature of about 40° to 50° C.
Claim 10
Dependent Claim
121 words
The method of claim 1, including suspending 100 g. of finely divided powdered cellulose in 1800 ml. of water, dissolving 15 g. of aluminum sulphate powder in the cellulose suspension as said dyeing aid of fixing agent, heating the suspension to about 50° C., dissolving 5 g. of turmeric in 1800 ml. of ethyl alcohol to form a dye solution, adding the dye solution in a fine stream to the cellulose suspension while stirring the suspension rapidly, continuing said stirring until all the turmeric is attached to the cellulose particles, filtering the slurry, washing the slurry with water, and drying the slurry at about 50° C. in a hot air oven to obtain a powdered natural dye pigment of yellow-orange color.
Claim 11
Dependent Claim
112 words
The method of claim 1, including suspending 100 g. of finely powdered cellulose in 1800 ml. of water, dissolving 10 g. of water soluble annatto powder in 800 ml. of water, adding the annatto powder solution to the cellulose suspension, heating the mass to boiling, adding 25 g. of sodium chloride as said dyeing aid or fixing agent, stirring the suspension for 10 minutes, filtering the suspension, washing the resulting cake with water and then washing it with dilute acidic acid, drying the cake at about 50° C. in a hot air oven to obtain a powdered natural pigment of red-orange color suitable for substitution for FD&C Yellow No 6 Aluminum Lake.
Claim 12
Dependent Claim
95 words
The method of claim 1, including suspending 100 g. of cellulose powder in 1500 ml. of water at room temperature, adding 25 g. of a grape skin extract, anthocyanins, to the suspension, adjusting the pH of the suspension to about 1.2 by adding a sufficient amount of hydrochloric acid as said dyeing aid or fixing agent, stirring the suspension for about 1 hour, filtering the suspension, washing the filtered cake with water at a pH of about 1.2, air drying the filtered cake at room temperature to obtain a powdered natural pigment of bluish-red appearance.
Claim 13
Dependent Claim
22 words
A pigment comprising a natural water insoluble edible powder dyed with an edible natural dye and a dyeing aid or fixing agent.
Claim 14
Dependent Claim
22 words
A pigment comprising a natural water insoluble edible powder dyed with an edible natural dye and a dyeing aid or fixing agent.
Claim 15
Dependent Claim
14 words
A pigment in accordance with claim 12 in which the powder is powdered cellulose.
Claim 16
Dependent Claim
15 words
A pigment in accordance with claim 12 in which the powder is powdered microcrystalline cellulose.
Claim 17
Dependent Claim
13 words
A pigment in accordance with claim 12 in which the powder is starch.
Claim 18
Dependent Claim
13 words
A pigment in accordance with claim 12 in which the dye is curcumin.
Claim 19
Dependent Claim
13 words
A pigment in accordance with claim 12 in which the dye is turmeric.
Claim 20
Dependent Claim
13 words
A pigment in accordance with claim 12 in which the dye is annatto.
Claim 21
Dependent Claim
16 words
A pigment in accordance with claim 12 in which the dye is a grape skin extract.
References Cited (Backward Citations)
US3162541A
Cited
US4263333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |