US4082722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-mixed dental composition for the preparation of a dental silicate cement
Assignee: SIH Stiftung and Co Industrie Holding KG
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Filing: 1976-09-08
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Granted: 1978-04-04
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Expires: 1996-09-08
Abstract
Abstract Compositions, which may be mixed with water to prepare a dental silicate cement, consist essentially of a silicate glass powder and a solid polymeric material selected of polymers of unsaturated α,β-dicarboxylic acids.
Inventors
- 👤 Werner Schmitt
- 👤 Robert Purrmann
- 👤 Peter Jochum
- 👤 Wolf-Dieter Zahler
- 👤 Rainer Grimm-Lenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:40
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A pre-mixed dental composition for the preparation of a dental silicate cement, when mixed with water, which consists essentially of an aluminum fluorosilicate glass powder and a solid polymeric material selected from the group consisting of homopolymer of an ethylenically unsaturated alpha, beta-dicarboxylic acid of 4-5 carbon-atoms, copolymer of said acids with each other, and copolymer of said acids with less than 10 mole percent of an ethylenically unsaturated monocarboxylic acid, methacrylic ester whose ester moiety is alkyl of 1-4 carbon atoms or methacrylic amide, the weight ratio of said powder to said polymer being 1.5:1 to 20:1.
Claim 2
Dependent Claim
98 words
A pre-mixed dental composition for the preparation of a dental silicate cement, when mixed with water, which consists essentially of an aluminum fluorosilicate glass powder and a solid polymeric material selected from the group consisting of homopolymer of an ethylenically unsaturated alpha, beta-dicarboxylic acid of 4-5 carbon-atoms, copolymer of said acids with each other, and copolymer of said acids with less than 10 mole percent of an ethylenically unsaturated monocarboxylic acid, methacrylic ester whose ester moiety is alkyl of 1-4 carbon atoms or methacrylic amide, the weight ratio of said powder to said polymer being 1.5:1 to 20:1.
Claim 3
Dependent Claim
12 words
The pre-mixed composition of claim 1 wherein the polymer is polymaleic acid.
Claim 4
Dependent Claim
19 words
The pre-mixed composition of claim 1 wherein the weight ratio of powder to solid polymer is 2.3:1 to 12.5:1.
Claim 5
Dependent Claim
23 words
The pre-mixed composition of claim 1, which additionally contains about 0.1 to 50 %, based on that polymeric material, of solid polyacrylic acid.
Claim 6
Dependent Claim
12 words
The pre-mixed composition of claim 1 wherein the polymer is polyitaconic acid.
References Cited (Backward Citations)
US3814717A
Cited
US3882080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |