US 6,306,784 B1Granted

Alkali silicate glass

AssigneeIvoclar AG

InventorsHelga Drescher, Martin Frank, Volker Rheinberger, Wolfram Höland

Life of this patent

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Abstract

Alkali silicate glasses are described which, in view of their good chemical stability and their optical properties and processing properties, are particularly suitable as a coating or veneering material for ceramic dental frameworks and hence for the production of all-ceramic dental restorations such as crowns or bridges.

Claims14

Dependent claims

An alkali silicate glass, which comprises the following components:

Component Wt. % SiO2 55.0 to 71.0 Al2O3 5.0 to 16.0 B2O3 0.2 to 10.0 K2O 4.5 to 10.0 Na2O 3.0 to 14.0 TiO2 + ZrO2 0.2 to 5.0.

Dependencies are inferred from the claim text.

Facts

Application: 09/590,978Filed 9 Jun 2000 · continuation
Priority: DE 197 25 55212 Jun 1997
Granted: 23 Oct 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

C03C 4/0021
For biologically-compatible glass: for dental use
A61K 6/17
Compositions characterised by their physical properties: particle size
A61K 6/75
Comprising phosphorus-containing compounds: apatite
A61K 6/807
Comprising ceramics: comprising magnesium oxide

Family

Application60/063,236Us provisional application · filed 23 Oct 1997
Application09/097,189Parent of this continuation · filed 12 Jun 1998
US 6,121,175 AParent of this continuation
US 6,306,784 B1This patent

From the US filing history. Foreign family members aren’t listed.

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