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Patent US4308190A successfully refreshed from Google Patents.
US4308190A
Expired / Lapsed
US
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Dental materials based on organic plastics in paste form
Assignee: Bayer AG
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Filing: 1979-11-19
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Granted: 1981-12-29
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Expires: 1999-11-19
Abstract
Abstract A dental material is provided based on organic plastics in paste form, which consists essentially of (a) a polymerizable binder, (b) a crosslinked bead polymer and (c) a fine-particled inorganic filler.
Inventors
- 👤 Michael Walkowiak
- 👤 Wolfgang Podszun
- 👤 Bernhard Leusner
- 👤 Carlhans Suling
- 👤 Hans H. Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:10
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
A dental material in paste form which consists essentially of (a) at least one polymerizable binder wherein at least 50% by weight of said binder is at least one ester of methacrylic acid and a monohydric or polyhydric alcohol, (b) at least one cross-linked bead polymer plastic made from at least one ester of methacrylic acid and a monohydric or polyhydric alcohol and (c) a fine-particled inorganic filler.
Claim 2
Dependent Claim
68 words
A dental material in paste form which consists essentially of (a) at least one polymerizable binder wherein at least 50% by weight of said binder is at least one ester of methacrylic acid and a monohydric or polyhydric alcohol, (b) at least one cross-linked bead polymer plastic made from at least one ester of methacrylic acid and a monohydric or polyhydric alcohol and (c) a fine-particled inorganic filler.
Claim 3
Dependent Claim
23 words
The dental material according to claim 1 wherein more than 80% by weight of the polymerizable binder is methacrylic acid ester or esters.
Claim 4
Dependent Claim
34 words
The dental material according to claim 2 wherein at least 50% by weight of the polymerizable binder is at least one ester of methacrylic acid with two or more polymerizable ethylenically unsaturated double bonds.
Claim 5
Dependent Claim
19 words
The dental material according to claim 1 or 2 wherein the polymerizable binder is a mixture of said esters.
Claim 6
Dependent Claim
40 words
The dental material according to claim 1 or 2 wherein said cross-linked bead polymer has been prepared by polymerizing one or more vinyl monomers, at least 50% by weight of said monomers being at least one ester of methacrylic acid.
Claim 7
Dependent Claim
24 words
The dental material according to claim 1 or 2 in which the crosslinked bead polymer has an average particle size of 10 to 100μ.
Claim 8
Dependent Claim
21 words
The dental material according to claim 1 or 2 in which the fine-particled inorganic filler has an average particle size <1μ.
Claim 9
Dependent Claim
17 words
The dental material according to claim 7 in which the fine-particled inorganic filler consists of silicon dioxide.
Claim 10
Dependent Claim
15 words
The dental material according to claim 7, in which the fine-particled inorganic filler is silanized.
Claim 11
Dependent Claim
32 words
The dental material according to claim 1 or 2 in which the proportion of crosslinked bead polymer and fine-particled inorganic filler together is 52 to 80% by weight of said dental material.
Claim 12
Dependent Claim
27 words
The dental material according to claim 1 or 2 in which the proportion of fine-particled inorganic filler is 5 to 50% by weight of said dental material.
Claim 13
Dependent Claim
25 words
The dental material according to claim 10, in which the proportion of fine-particled inorganic filler is 5 to 28% by weight of said dental material.
References Cited (Backward Citations)
US3539533A
Cited
US3911581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |