US4336153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass composition for water setting ion-polymer cements
Assignee: STC PLC
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Filing: 1980-10-16
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Granted: 1982-06-22
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Expires: 2000-10-16
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
2026-10-24 14:22
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/446; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61K6/889; A61L15/00; A61L15/07; A61L15/12; A61L24/00; A61L24/0047; A61L24/0073; A61L24/0089; C; C04; C04B; C04B28/00; C04B28/28; C08; C08K; C08K3/00; C08K3/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A glass composition for effecting crosslinking of a polycarboxylic acid cement, said composition including an aluminoborate type glass comprising 40 to 75 mole % boric oxide, not more than 20 mole % alumina, not more than 60 mole % zinc oxide, and not more than 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
67 words
A glass composition for effecting crosslinking of a polycarboxylic acid cement, said composition including an aluminoborate type glass comprising 40 to 75 mole % boric oxide, not more than 20 mole % alumina, not more than 60 mole % zinc oxide, and not more than 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
47 words
A glass composition for effecting crosslinking of a polycarboxylic acid cement, said composition including an aluminoborate type glass comprising 43 to 50 mole % boric oxide, 33 to 42 mole % calcium oxide, 11 to 14 mole % zinc oxide and 4 to 7 mole % alumina.
Claim 4
Dependent Claim
47 words
A glass composition for effecting crosslinking of a polycarboxylic acid cement, said composition including an aluminoborate type glass comprising 43 to 50 mole % boric oxide, 33 to 42 mole % calcium oxide, 11 to 14 mole % zinc oxide and 4 to 7 mole % alumina.
Claim 5
Dependent Claim
32 words
A glass as claimed in claim 1 or 2, in which further includes a minor proportion of one or more oxides of magnesium, barium, strontium, copper, iron, nickel, cobalt or mixtures thereof.
Claim 6
Dependent Claim
12 words
A glass as claimed in claim 1 which is in particulate form.
Claim 7
Dependent Claim
18 words
A glass as claimed in claim 4 in which said particles have a diameter less than 75 microns.
Claim 8
Dependent Claim
12 words
A glass as claimed in claim 1 which is in fibre form.
Claim 9
Dependent Claim
17 words
A glass as claimed in claim 6 in which said fibres comprise a woven or non-woven fabric.
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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |