Patent US4836853A successfully refreshed from Google Patents.
US4836853A
Expired / Lapsed
US
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Algin based dental impression material containing biocidal component
Assignee: Dentsply GmbH
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Filing: 1988-07-08
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Granted: 1989-06-06
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Expires: 2008-07-08
Abstract
Abstract A dental impression composition comprising alginate material and biocidal component. A method for reducing microorganism contamination in alginate dental impressions comprising preparing a mixture comprising alginate, water and biocide.
Inventors
- 👤 Hans-Peter K. Gribi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:54
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/90; Y; Y10; Y10S; Y10S264/00; Y10S264/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
A dental impression material comprising a water soluble salt of alginic acid and a setting reactant, the improvement comprising the addition of a biocide comprising about 0.3 to about 6.5 percent by weight of said dental impression material wherein said biocide is didecyldimethyl ammonium chloride.
Claim 2
Dependent Claim
45 words
A dental impression material comprising a water soluble salt of alginic acid and a setting reactant, the improvement comprising the addition of a biocide comprising about 0.3 to about 6.5 percent by weight of said dental impression material wherein said biocide is didecyldimethyl ammonium chloride.
Claim 3
Dependent Claim
48 words
A dental impression material comprising a water soluble salt of alginic acid, a setting reactant, a retarder and fillers, the improvement comprising the addition of a biocide comprising about 0.3 to about 6.5 percent by weight of said dental impression material wherein said biocide is didecyldimethyl ammonium chloride.
Claim 4
Dependent Claim
48 words
A dental impression material comprising a water soluble salt of alginic acid, a setting reactant, a retarder and fillers, the improvement comprising the addition of a biocide comprising about 0.3 to about 6.5 percent by weight of said dental impression material wherein said biocide is didecyldimethyl ammonium chloride.
Claim 5
Dependent Claim
68 words
In a dental impression material comprising a water soluble salt of alginic acid, a setting reactant, a retarder, fillers, a surface hardening agent and a non-volatile, non-aqueous compound to prevent fine powders from dusting during dispensing, measuring and mixing, the improvement comprising the addition of a biocide comprising didecyldimethyl ammonium chloride in the amount of about 0.3 to about 6.5 percent by weight of said dental impression material.
Claim 6
Dependent Claim
68 words
In a dental impression material comprising a water soluble salt of alginic acid, a setting reactant, a retarder, fillers, a surface hardening agent and a non-volatile, non-aqueous compound to prevent fine powders from dusting during dispensing, measuring and mixing, the improvement comprising the addition of a biocide comprising didecyldimethyl ammonium chloride in the amount of about 0.3 to about 6.5 percent by weight of said dental impression material.
Claim 7
Dependent Claim
68 words
The dental impression material of claim 2 wherein said biocide comprises about 0.3 to about 6.5 percent by weight, said alginic acid salt comprises about 5 to about 20 percent by weight, said filler comprises about 40 to about 70 percent by weight and said setting reactant comprises about 8 to about 30 percent by weight and said retarder comprises about 0.5 to about 10 percent by weight.
Claim 8
Dependent Claim
22 words
The dental impression material of claim 2 wherein said alginate and said biocidal component are included in a dry powder precursor composition.
Claim 9
Dependent Claim
15 words
The dental impression material of claim 2 in the form of a set dental impression.
Claim 10
Dependent Claim
68 words
The dental impression material of claim 3 wherein said biocide comprises about 0.3 to about 6.5 percent by weight, said alginic acid salt comprises about 5 to about 20 percent by weight, said filler comprises about 40 to about 70 percent by weight and said setting reactant comprises about 8 to about 30 percent by weight and said retarder comprises about 0.5 to about 10 percent by weight.
Claim 11
Dependent Claim
22 words
The dental impression material of claim 3 wherein said alginate and said biocidal component are included in a dry powder precursor composition.
Claim 12
Dependent Claim
15 words
The dental impression material of claim 3 in the form of a set dental impression.
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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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |