Patent US3959212A successfully refreshed from Google Patents.
US3959212A
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Radio-opaque dental restorative material
Assignee: American Hospital Supply Corp
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Filing: 1974-06-03
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Granted: 1976-05-25
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Expires: 1994-06-03
Abstract
Abstract A radio-opaque composite material for use as a dental restorative which consists essentially of a conventional polymerizable resin binder and catalysts in admixture with a finely-divided inorganic filler capable of being coupled to the binder. The filler comprises a crystalline silicate containing barium in the crystalline composition. Calcium barium silicate in crystalline form is set forth in disclosing the best known mode for practicing the invention.
Inventors
- 👤 Thomas J. Rockett
- 👤 John J. O'Connell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:14
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A dental composite consisting essentially of a polymerizable resin binder, a catalyst system for polymerizing said binder, and a finely-divided inorganic filler capable of being coupled to said binder, in which the improvement lies in said filler comprising a crystalline silicate containing barium as part of the crystalline composition thereof and selected from the group consisting of Ca 2 Ba(SiO 3 ) 3 , BaAl 2 Si 2 O 8 , and BaMgCa 2 Si 2 O 8 .
Claim 2
Dependent Claim
79 words
A dental composite consisting essentially of a polymerizable resin binder, a catalyst system for polymerizing said binder, and a finely-divided inorganic filler capable of being coupled to said binder, in which the improvement lies in said filler comprising a crystalline silicate containing barium as part of the crystalline composition thereof and selected from the group consisting of Ca 2 Ba(SiO 3 ) 3 , BaAl 2 Si 2 O 8 , and BaMgCa 2 Si 2 O 8 .
Claim 3
Dependent Claim
53 words
A dental composite consisting essentially of a polymerizable resin binder, a catalyst system for polymerizing said binder, and a finely-divided inorganic filler capable of being coupled to said binder, in which the improvement lies in said filler comprising a crystalline calcium barium silicate having the formula Ca 2 Ba(SiO 3 ) 3 .
Claim 4
Dependent Claim
53 words
A dental composite consisting essentially of a polymerizable resin binder, a catalyst system for polymerizing said binder, and a finely-divided inorganic filler capable of being coupled to said binder, in which the improvement lies in said filler comprising a crystalline calcium barium silicate having the formula Ca 2 Ba(SiO 3 ) 3 .
Claim 5
Dependent Claim
64 words
A radio-opaque direct filling dental composite comprising a finely-divided inorganic filler, a polymerizable binder, and catalyst means for polymerizing said binder, wherein the improvement comprises said filler being composed at least predominantly of finely-divided particles of crystalline barium calcium silicate having a barium content of at least 15 mole percent of said filler and having the formula Ca 2 Ba(SiO 3 ) 3 .
Claim 6
Dependent Claim
64 words
A radio-opaque direct filling dental composite comprising a finely-divided inorganic filler, a polymerizable binder, and catalyst means for polymerizing said binder, wherein the improvement comprises said filler being composed at least predominantly of finely-divided particles of crystalline barium calcium silicate having a barium content of at least 15 mole percent of said filler and having the formula Ca 2 Ba(SiO 3 ) 3 .
Claim 7
Dependent Claim
23 words
The composite of claim 3 in which said finely-divided crystalline silicate particles are of an average size no greater than about 50 microns.
Claim 8
Dependent Claim
18 words
The composite of claim 3 wherein said filler has a minor proportion of calcium silicate associated with it.
References Cited (Backward Citations)
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US3826778A
Cited
US3715331A
Cited
US3801344A
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US3827901A
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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) | 1979-05-25 | 1979-11-24 | 1980-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-25 | 1983-11-24 | 1984-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-25 | 1987-11-24 | 1988-05-25 | $7700.00 | Window Closed / Lapsed |