US5055305A
Expired / Lapsed
US
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Cleansing compositions
Assignee: Richardson Vicks Inc
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Filing: 1988-12-02
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Granted: 1991-10-08
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Expires: 2008-12-02
Abstract
Abstract Denture cleansing tablet comprising an inorganic persalt bleaching agent, an organic peroxyacid bleach precursor and a solid base material which in the presence of water releases carbon dioxide with effervescence. The composition provides more rapid and efficaceous denture cleansing performance and anti-bacterial activity.
Inventors
- 👤 Kenneth Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:58
CPC Classifications
A; A61; A61Q; A61Q11/00; A61Q11/02; A61K; A61K8/00; A61K8/02; A61K8/0216; A61K8/18; A61K8/19; A61K8/30; A61K8/33; A61K8/37; A61K8/40; A61K8/42; A61K2800/00; A61K2800/20; A61K2800/22; A61K2800/222
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
Denture cleansing tablet comprising: (a) an inorganic persalt bleaching agent wherein said agent comprises a mixture of alkali metal persulfate and alkali metal perborate bleaching agents; (b) an organic peroxyacid bleach precursor; and (c) a solid base material having incorporated therein an effervescence producing composition which in the presence of water releases carbon dioxide, and wherein the solid base material comprises two or more component phases having different pH in aqueous medium, at least one phase having an acidic pH and having incorporated therein the organic peroxyacid bleach precursor and at least a portion of the alkali metal persulfate, and at least one other phase having an alkaline pH and having incorporated therein the alkali metal perborate.
Claim 2
Dependent Claim
117 words
Denture cleansing tablet comprising: (a) an inorganic persalt bleaching agent wherein said agent comprises a mixture of alkali metal persulfate and alkali metal perborate bleaching agents; (b) an organic peroxyacid bleach precursor; and (c) a solid base material having incorporated therein an effervescence producing composition which in the presence of water releases carbon dioxide, and wherein the solid base material comprises two or more component phases having different pH in aqueous medium, at least one phase having an acidic pH and having incorporated therein the organic peroxyacid bleach precursor and at least a portion of the alkali metal persulfate, and at least one other phase having an alkaline pH and having incorporated therein the alkali metal perborate.
Claim 3
Dependent Claim
41 words
Cleansing tablet according to claim 1 wherein the alkaline phase dissolves or disperses in water more slowly than or later than the acidic phase in order to provide, on placing the tablet in water, an initial pH in the acidic range.
Claim 4
Dependent Claim
33 words
Cleansing tablet according to claim 2 wherein the initial pH is from about 2 to about 6.5 and is maintained within the acid range for from about 30 seconds to about 3 hours.
Claim 5
Dependent Claim
33 words
Cleansing tablet according to claim 3 wherein the initial pH is from about 3 to about 5 and is maintained within the acid range for from about 1 minute to about 60 minutes.
Claim 6
Dependent Claim
37 words
Cleansing tablet according to claim 4 wherein the alkaline phase is present in sufficient excess of the acidic phase in order to shift, upon completion of effervescence, the pH of the aqueous medium into the alkaline range.
Claim 7
Dependent Claim
30 words
Cleansing tablet according to claim 5 wherein the solid base material comprises a (bi)carbonate/acid effervescent couple and wherein at least the acidic phase incorporates both components of the effervescent couple.
Claim 8
Dependent Claim
30 words
Cleansing tablet according to claim 6 comprising two or more discrete layers, at least one layer comprising the acid phase and at least one other layer comprising the alkaline phase.
Claim 9
Dependent Claim
85 words
Cleansing tablet according to claim 7 wherein the organic peroxyacid bleach precursor is selected from the group consisting of acylated polyalkyldiamines and carboxylic esters having the general formula AcL wherein Ac is the acyl moiety of an organic carboxylic acid comprising an optionally substituted, linear or branched C 6 -C 20 alkyl or alkenyl moiety or a C 6 -C 20 alkyl-substituted aryl moiety and L is a leaving group, the conjugate acid of which has a pKa in the range from 4 to 13.
Claim 10
Dependent Claim
78 words
Cleansing tablet according to claim 1 wherein the organic peroxyacid bleach precursor is selected from carboxylic esters having the general formula AcL wherein Ac is the acyl moiety of an organic carboxylic acid comprising an optionally substituted, linear or branched C 6 -C 20 alkyl or alkenyl moiety or a C 6 -C 20 alkyl-substituted aryl moiety and L is a leaving group, the conjugate acid of which has a pKa in the range from 4 to 13.
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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) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |