US4250277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition for water setting ion-polymer cements
Assignee: STC PLC
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Filing: 1980-01-07
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Granted: 1981-02-10
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Expires: 2000-01-07
Abstract
Abstract A glass composition for effecting crosslinking of a polycarboxylic acid cement and cement compositions formed therefrom. The glass is of the aluminoborate type and comprises 40 to 75 mole % boric oxide, not more than 60 mole % zinc oxide, not more than 50 mole % calcium oxide and not more than 20 mole % alumina. Cements formed from the glasses have a wide range of applications including structural cements, dental filler and orthopaedic cements.
Inventors
- 👤 Alan Maries
- 👤 Francesca M. Shreeve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/28; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889; A61L; A61L15/00; A61L15/07; A61L15/12; A61L27/00; A61L27/40; A61L27/44; A61L27/446; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/145; C03C3/16; C03C4/00; C03C4/0035; Y; Y10; Y10S; Y10S528/00; Y10S528/92
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
A cement composition comprising a polycarboxylic acid material and a partially or completely water soluble glass said polycarboxylic acid material derived from unsaturated mono- or di-carboxylic acid monomer materials, said glass comprising a glass composition for effecting crosslinking of a polycarboxylic acid cement, said composition including an aluminoborate type glass comprising 40 to 75 mole % boric acid, 3.5 to 10 mole % alumina, 12.5 to 60 mole % zinc oxide, and 10.0 to 50 mole % calcium oxide, the remainder if any comprising one or more further metal oxides, or phosphorus pentoxide or mixtures thereof.
Claim 2
Dependent Claim
96 words
A cement composition comprising a polycarboxylic acid material and a partially or completely water soluble glass said polycarboxylic acid material derived from unsaturated mono- or di-carboxylic acid monomer materials, said glass comprising a glass composition for effecting crosslinking of a polycarboxylic acid cement, said composition including an aluminoborate type glass comprising 40 to 75 mole % boric acid, 3.5 to 10 mole % alumina, 12.5 to 60 mole % zinc oxide, and 10.0 to 50 mole % calcium oxide, the remainder if any comprising one or more further metal oxides, or phosphorus pentoxide or mixtures thereof.
Claim 3
Dependent Claim
41 words
A cement composition as claimed in claim 1 in which said glass comprises 43 to 50 mole % boric oxide, 33 to 42 mole % calcium oxide, 11 to 14 mole % zinc oxide and 4 to 7 mole % aluminum.
Claim 4
Dependent Claim
16 words
A cement composition as claimed in claim 1 in which the polycarboxylic acid is polyacrylic acid.
Claim 5
Dependent Claim
23 words
A cement composition as claimed in claim 3 in which the polyacrylic acid has a number average molecular weight of 1,000 to 1,000,000.
Claim 6
Dependent Claim
22 words
A cement composition as claimed in claim 1 in which the ratio of polycarboxylic acid to glass is from 1:5 to 2:1.
Claim 7
Dependent Claim
14 words
A cement composition as claimed in claim 1 which includes a solid filler material.
Claim 8
Dependent Claim
19 words
A cement composition as claimed in claim 1 which includes one or more chemically or biologically active additive materials.
Claim 9
Dependent Claim
11 words
A dental filling comprising a cement as claimed in claim 1.
Claim 10
Dependent Claim
12 words
A splint bandage including a cement composition as claimed in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |