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:
Sep. 09, 2008
Filed:
Aug. 13, 2003
Applicants:
Espen Olsen, Trondheim, NO;
Arve Solheim, Tiller, NO;
Havard Sorheim, Trondheim, NO;
Inventors:
Assignee:
Crusin AS, , NO;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B 21/06 (2006.01); C01B 21/068 (2006.01); C30B 15/00 (2006.01); C30B 27/02 (2006.01); C30B 28/10 (2006.01); B22F 1/00 (2006.01); B22F 3/093 (2006.01); B22F 3/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to silicon nitride mould parts, particularly crucibles for use in connection with directional solidification and pulling of silicon single crystals. The mould parts consist of SiNhaving a total open porosity between 40 and 60% by volume and where more than 50% of the pores in the surface of the mould parts have a size which is larger than the means size of the SiNparticles. The invention further relates to a method for producing the silicon nitride mould parts.