Patent US4394465A successfully refreshed from Google Patents.
US4394465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental materials based on organic plastics in paste form
Assignee: Bayer AG
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Filing: 1980-09-05
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Granted: 1983-07-19
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Expires: 2000-09-05
Abstract
Abstract The invention provides dental materials in paste form consisting essentially of (a) 18 to 50% by weight of a polymerizable binder, (b) 20 to 65% by weight of a crosslinked bead polymer with an average particle size of 5 to 150 μm and (c) 5 to 45% by weight of glass beads with an average particle size of 5 to 80 μm. The pastes of the invention are outstandingly suitable as a dental filling material.
Inventors
- 👤 Wolfgang Podszun
- 👤 Michael Walkowiak
- 👤 Hans-Hermann Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:39
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
69 words
A dental material which is based on organic plastics and is in paste form, characterized in that it comprises (a) 18 to 50% by weight of a polymerisable binder, (b) 20 to 65% by weight of a crosslinked bead polymer with an average particle size of 5 to 100 μm and (c) 5 to 45% by weight of glass beads with an average particle size of 5 to 80μ.
Claim 2
Dependent Claim
69 words
A dental material which is based on organic plastics and is in paste form, characterized in that it comprises (a) 18 to 50% by weight of a polymerisable binder, (b) 20 to 65% by weight of a crosslinked bead polymer with an average particle size of 5 to 100 μm and (c) 5 to 45% by weight of glass beads with an average particle size of 5 to 80μ.
Claim 3
Dependent Claim
46 words
A dental material according to claim 1, characterized in that it consists essentially of (a) 22 to 35% by weight of the polymerisable binder, (b) 25 to 55% by weight of the crosslinked bead polymer and (c) 10 to 40% by weight of the glass beads.
Claim 4
Dependent Claim
33 words
A dental material according to claim 1 or 2, characterized in that it contains up to 30% by weight of an inorganic filler with an average particle size of 1 mμ to 1μ.
Claim 5
Dependent Claim
31 words
A dental material according to claims 1 or 2, characterized in that the polymerisable binder consists essentially of ester(s) of methacrylic acid to the extent of more than 80% by weight.
Claim 6
Dependent Claim
35 words
A dental material according to claim 4, characterized in that the polymerisable binder consists of ester(s) of methacrylic acid with two or more polymerizable double bonds to the extent of at least 50% by weight.
Claim 7
Dependent Claim
26 words
A dental material according to claims 1 or 2, characterized in that the crosslinked bead polymer has an average particle size of 8 to 80 μm.
Claim 8
Dependent Claim
33 words
A dental material according to claims 1 or 2, characterized in that the crosslinked bead polymer is build up from ester(s) of methacrylic acid to the extent of more than 80% by weight.
Claim 9
Dependent Claim
34 words
A dental material according to claim 7, characterized in that the crosslinked bead polymer contains up to 50% by weight of incorporated inorganic filler with an average particle size of 1 mμ to 1μ.
Claim 10
Dependent Claim
24 words
A dental material according to claim 1 or 2 characterized in that the glass beads have an average particle size of 10 to 40μ.
Claim 11
Dependent Claim
17 words
A dental material according to claims 1 or 2, characterized in that the glass beads are silanised.
Claim 12
Dependent Claim
17 words
A dental material according to claim 10, characterized in that the glass beads are treated with trimethoxy-(3-methylacryloyloxypropyl)-silane.
Claim 13
Dependent Claim
17 words
A dental material according to claim 10, characterized in that the glass beads are treated with vinyl-trimethoxysilane.
Claim 14
Dependent Claim
18 words
A dental material according to claim 3, characterized in that the inorganic filler consists essentially of silicon dioxide.
Claim 15
Dependent Claim
16 words
A dental material according to claim 3, characterized in that the fine-particled inorganic fillers are silanized.
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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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |