The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 2017
Filed:
Mar. 27, 2015
Dentsply International Inc., York, PA (US);
Markus Vollmann, Gelnhausen, DE;
Udo Schusser, Alzenau, DE;
DENTSPLY INTERNATIONAL INC., York, PA (US);
Abstract
The invention relates to a method for producing a blank of lithium silicate glass a starting composition of at least 8 wt-% of a stabilizer selected from the group consisting of ZrO, HfO, and mixtures thereof, wherein the method includes the steps of mixing the raw materials comprising the stabilizer in powder form, wherein the powder of the stabilizer has a particle size d=x with 0.3 μm≦x≦1.5 μm, melting the raw materials in a crucible at a temperature Tand storing the melt in the crucible for a time t, pouring the homogenized melt into molds, wherein the melt flows out of the crucible with a discharge temperature Tbeing T≧T, wherein the filling of the molds and the molding of the melt in the molds takes place with a cooling rate A.