US5433941A
Expired / Lapsed
US
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Sol gel composition for producing glassy coatings
Assignee: BTG International Ltd
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Filing: 1992-07-08
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Granted: 1995-07-18
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Expires: 2012-07-08
Abstract
Abstract Glassy coatings are made by curing in situ a coating of a sol gel of tetraethoxysilicon, water, alcohol, and the alkoxides of: Al, Ti and Na; or of Na and Zr. The coating may be applied to teeth as a dental fissure sealant or varnish to protect restorations, or (if filled) as an inherently coloured cosmetic coating, or as a prophylactic coating.
Inventors
- 👤 Bipin C. M. Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:40
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/02; A; A61; A61K; A61K6/00; A61K6/20; C09D183/14; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/1212; C23C18/125; C23C18/1254; C23C18/1295; C23C18/14; C23C18/143
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
37 words
A sol gel, xerogel or heat-consolidated gel composition comprising a hydrolysable silicic ester, a solvent, and alkoxides of: a GpIA metal, and of: any one, two or more of Al, a GpVB metal and a GpIVB metal.
Claim 2
Dependent Claim
37 words
A sol gel, xerogel or heat-consolidated gel composition comprising a hydrolysable silicic ester, a solvent, and alkoxides of: a GpIA metal, and of: any one, two or more of Al, a GpVB metal and a GpIVB metal.
Claim 3
Dependent Claim
15 words
A composition according to claim 1, wherein the silicic ester is silicon tetrahalide or tetraalkoxysilicon.
Claim 4
Dependent Claim
12 words
A composition according to claim 1, wherein the GpIA metal is sodium.
Claim 5
Dependent Claim
12 words
A composition according to claim 1, wherein the GpIVB metal is titanium.
Claim 6
Dependent Claim
21 words
A composition according to any of claim 1, wherein the metal alkoxides are: (i) Al, Ti, Na; or (ii) Zr, Na.
Claim 7
Dependent Claim
10 words
A composition according to claim 1, further comprising a filler.
Claim 8
Dependent Claim
21 words
A composition according to claim 6, wherein the filler comprises up to the 30% by weight of the composition before curing.
Claim 9
Dependent Claim
16 words
A composition according to claim 6, wherein the filler is in the form of flat plates.
Claim 10
Dependent Claim
13 words
A composition according to claim 8, wherein the filler comprises talc or mica.
Claim 11
Dependent Claim
15 words
A composition according to claim 6, wherein the filler comprises laponite, zeolite, kaolinite or vermiculite.
Claim 12
Dependent Claim
11 words
A composition according to claim 6, wherein the filler is coated.
Claim 13
Dependent Claim
25 words
A composition according to claim 11, wherein the filler is coated with any ones two or more of titanium dioxide, chromium oxide and ferric oxide.
Claim 14
Dependent Claim
27 words
A composition according to claim 6, the mean filler particle size is up to 3 μm in one dimension and 5-100 μm in the other two dimensions.
Claim 15
Dependent Claim
22 words
A composition according to claim 1, wherein the composition comprises water and wherein the molar proportion of water:silicon is (1 to 4):1.
Claim 16
Dependent Claim
14 words
A composition according to claim 1, wherein the solvent comprises a ketone or alcohol.
Claim 17
Dependent Claim
18 words
A composition according to claim 1, wherein, taking atoms of Si+GpIA+Al+GpIVB+GpVB as 100, silicon is at least 30.
Claim 18
Dependent Claim
11 words
A composition according to claim 16, wherein GpIA is under 50.
Claim 19
Dependent Claim
12 words
A composition according to claim 16, wherein Al is from to 15.
Claim 20
Dependent Claim
12 words
A composition according to claim 16, wherein Al+GpVB+GpIVB together is from 3-15.
Claim 21
Dependent Claim
16 words
A composition according to claim 16, wherein Al+GpVB+GpIVB together does not exceed one-sixth of the silicon.
Claim 22
Dependent Claim
15 words
A composition according to claim 1, further comprising a non-metallic glass former (other than Si).
Claim 23
Dependent Claim
31 words
A composition according to claim 1, during the synthesis of which an ageing step comprised admitting moisture to the composition at a rate under 1% of the rate in free air.
Claim 24
Dependent Claim
26 words
A process for producing a glassy coating, comprising applying a composition according to any preceding claim to an object to be coated, and curing the coating.
Claim 25
Dependent Claim
19 words
A process according to claim 23, wherein the coating as applied (before curing) is up to 30 μm thick.
Claim 26
Dependent Claim
20 words
A process according to claim 23, wherein the coating is cured by an energy input of 2-10 J/mm 2 .
Claim 27
Dependent Claim
23 words
A process according to claim 23, wherein the coating is cured by energy supplied at a rate of under 4 W/mm 2 .
Claim 28
Dependent Claim
62 words
A method for cosmetic colouring of a tooth, comprising performing a process according to claim 23, wherein said object is the tooth and wherein: the composition includes a pigment; or a said filler is present and is formulated to appear a tooth-like colour in the applied thickness; or a cosmetic stain is applied to the tooth prior to applying the said composition.
Claim 29
Dependent Claim
22 words
A method for prophylactic protection of a tooth, comprising performing a process according to claim 23, wherein said object is the tooth.
Claim 30
Dependent Claim
26 words
A method according to claim 28, wherein a said filler is present and is so formulated as to appear a tooth-like colour in the applied thickness.
Claim 31
Dependent Claim
13 words
A process according to claim 23, wherein said object is a patient's tooth.
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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) | 1998-07-17 | 1999-01-16 | 1999-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-17 | 2003-01-16 | 2003-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-17 | 2007-01-16 | 2007-07-18 | $7700.00 | Window Closed / Lapsed |