Patent US4372836A successfully refreshed from Google Patents.
US4372836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light curable acrylic dental composition with calcium fluoride pigment
Assignee: THERA-PATENT GmbH and Co KG
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Filing: 1979-01-02
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Granted: 1983-02-08
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Expires: 1999-01-02
Abstract
Abstract An improved opaque, photopolymerizable dental filling material is provided comprised of acrylic acid ester compounds containing mono and/or polyfunctional acrylic or methacrylic ester compounds, photoinitiators, pigments and possibly activators and silicon dioxide or silicate fillers, the improvement comprising the presence of finely divided calcium fluoride as a white pigment in a quantity of from 1-20 percent by weight. The presence of the calcium fluoride enables an opaque effect to be achieved without reducing the permeability of the filling material to polymerization radiation.
Inventors
- 👤 Werner Schmitt
- 👤 Robert Purrmann
- 👤 Peter Jochum
- 👤 Heinz-Joachim Hubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:04
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
In an opaque, photopolymerizable dental filling material comprised of acrylic acid ester compounds comprised of mono or polyfunctional acrylic or methacrylic ester compounds, a photoinitiator and a white pigment, the improvement wherein said material comprises from 1-20 percent by weight of finely divided calcium fluoride as said white pigment, based on the weight of the filling material.
Claim 2
Dependent Claim
57 words
In an opaque, photopolymerizable dental filling material comprised of acrylic acid ester compounds comprised of mono or polyfunctional acrylic or methacrylic ester compounds, a photoinitiator and a white pigment, the improvement wherein said material comprises from 1-20 percent by weight of finely divided calcium fluoride as said white pigment, based on the weight of the filling material.
Claim 3
Dependent Claim
21 words
The dental filling material of claim 1 wherein said calcium fluoride is present in an amount of 2-15 percent by weight.
Claim 4
Dependent Claim
22 words
The dental filling material of claim 1 or 2 wherein the calcium fluoride has a particle size of less than 60 microns.
Claim 5
Dependent Claim
20 words
The dental filling material of claim 3 wherein the calcium fluoride has a particle size of less than 10 microns.
Claim 6
Dependent Claim
14 words
The dental filling material of claim 1 further comprising silicon dioxide or silicate-based fillers.
Claim 7
Dependent Claim
25 words
The dental filling material of claim 1 wherein said photoinitiator is selected from the group consisting of benzoin and its derivatives, benzil monoketals and 1,2-diketones.
Claim 8
Dependent Claim
24 words
The dental filling material of claim 1 further comprising an activator selected from the group consisting of aliphatic or aromatic or mixed aliphatic-aromatic phosphites.
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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) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |