US4652313A
Expired / Lapsed
US
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Aqueous lake pigment suspension
Assignee: Chr Hansen Inc
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Filing: 1984-10-24
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Granted: 1987-03-24
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Expires: 2004-10-24
Abstract
Abstract This invention relates to a pigment suspension usable for film coating tablets and the like, comprising lake pigment particles, a polymeric colloid, a viscosity lowering agent, which permits a higher concentration of pigment particles in the pigment suspension, and an aqueous solvent. A typical pigment suspension comprises a lake pigment, titanium dioxide, a natural gum, sodium tartrate, and water.
Inventors
- 👤 Patrick Den Boer
- 👤 Richard F. Heinze
- 👤 Benjamin L. Meyers
- 👤 Barendra C. Mallik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:54
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/20; A61K9/28; C; C09; C09D; C09D17/00; C09D17/001
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
47 words
A composition consisting essentially of a lake pigment, a polymeric colloid, said polymeric colloid being a natural or synthetic gum, a viscosity lowering agent, the viscosity lowering agent being a salt of a dicarboxylic or tricarboxylic acid compound, and an aqueous solvent, the aqueous solvent being water.
Claim 2
Dependent Claim
47 words
A composition consisting essentially of a lake pigment, a polymeric colloid, said polymeric colloid being a natural or synthetic gum, a viscosity lowering agent, the viscosity lowering agent being a salt of a dicarboxylic or tricarboxylic acid compound, and an aqueous solvent, the aqueous solvent being water.
Claim 3
Dependent Claim
32 words
The composition of claim 1, wherein said gum is selected from the group consisting of gum arabic, quar gum, agar, xanthum gum, PG alginate, hydroxypropyl cellulose, gum trag, gelatin, pectin, and carrageenan.
Claim 4
Dependent Claim
22 words
The composition of claim 1, wherein said gum is selected from the group consisting of gum arabic, xanthan gum, and quar gum.
Claim 5
Dependent Claim
16 words
The composition of claim 1, wherein the pigment is an FD&C lake, D&C lake, or carmine.
Claim 6
Dependent Claim
18 words
The composition of claim 1, wherein the pigment is a combination of a lake pigment and titanium dioxide.
Claim 7
Dependent Claim
23 words
The composition of claim 1, wherein the viscosity lowering agent is the salt of an organic compound containing at least one carboxylic group.
Claim 8
Dependent Claim
13 words
The composition of claim 1, wherein the viscosity lowering agent is a lactone.
Claim 9
Dependent Claim
40 words
The composition of claim 1, wherein the viscosity lowering agent is selected from the group consisting of the salts of tartaric acid, citric acid, fumaric acid, adipic acid, maleic acid and ascorbic acid and mixtures with the acid form thereof.
Claim 10
Dependent Claim
29 words
The composition of claim 1, wherein the viscosity lowering agent is selected from the group consisting of salts of tartaric acid, citric acid and mixtures with the acid thereof.
Claim 11
Dependent Claim
47 words
The composition of claim 1, wherein the percent of the pigment is 20 to 75%, the percent of the polymeric colloid is 0.005 to 5, the percent of the viscosity lowering agent is 0.005 to 5 and the percent of an Aqueous solvent is 5 to 80.
Claim 12
Dependent Claim
37 words
The composition of claim 9, comprising 25 to 65% of a pigment, 0.01 to 2 percent of a gum, 0.005 to 2 percent of a viscosity lowering agent, and 10 to 75 percent of an aqueous solvent.
Claim 13
Dependent Claim
40 words
The composition of claim 9, comprising 30 to 60 percent of a pigment, 0.05 to 0.50 percent of a polymeric colloid, and 0.01 to 0.50 percent of a viscosity lowering agent, and 30 to 60 percent of an aqueous solvent.
Claim 14
Dependent Claim
37 words
A composition consisting essentially of a pigment, a viscosity lowering agent, the viscosity lowering agent being a salt of a dicarboxylic, or tricarboxylic acid compound, an aqueous solvent, the aqueous solvent being water, and an organic solvent.
Claim 15
Dependent Claim
37 words
A composition consisting essentially of a pigment, a viscosity lowering agent, the viscosity lowering agent being a salt of a dicarboxylic, or tricarboxylic acid compound, an aqueous solvent, the aqueous solvent being water, and an organic solvent.
Claim 16
Dependent Claim
21 words
The composition of claim 13, wherein the organic solvent is selected from the group comprising propylene glycol, glycerin, and polyethylene glycol.
Claim 17
Dependent Claim
35 words
A composition consisting essentially of a pigment, a viscosity lowering agent, the viscosity lowering agent being a salt of a dicarboxylic or tricarboxylic acid compound, sugar, and an aqueous solvent, the aqueous solvent being water.
Claim 18
Dependent Claim
35 words
A composition consisting essentially of a pigment, a viscosity lowering agent, the viscosity lowering agent being a salt of a dicarboxylic or tricarboxylic acid compound, sugar, and an aqueous solvent, the aqueous solvent being water.
Claim 19
Dependent Claim
32 words
The composition of claim 15, comprising by weight about 20 to 80 percent sugar syrup, about 25 to 65 percent pigment, and about 0.05 to 5 percent of a viscosity lowering agent.
Claim 20
Dependent Claim
16 words
The composition of claim 13, wherein the pigment is an FD&C lake, D&C lake, or carmine.
Claim 21
Dependent Claim
18 words
The composition of claim 13, wherein the pigment is a combination of a lake pigment and titanium dioxide.
Claim 22
Dependent Claim
13 words
The composition of claim 13, wherein the viscosity lowering agent is a lactone.
Claim 23
Dependent Claim
39 words
The composition of claim 13, wherein the viscosity lowering agent is selected form the group consisting of the salts of tartaric acid, citric acid, fumaric acid, adipic acid, maleic acid and ascorbic acid and mixtures with the acid thereof.
Claim 24
Dependent Claim
21 words
The composition of claim 15, wherein the viscosity lowering agent is in the range of 0.1 to 1.0 percent, preferably 0.5.
Claim 25
Dependent Claim
10 words
The composition of claim 15, wherein the sugar is sucrose.
Claim 26
Dependent Claim
29 words
The composition of claim 15, wherein the viscosity lowering agent is selected from the group consisting of salts of tartaric acid, citric acid and mixtures of the acid thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |