Patents Represented by Attorney, Agent or Law Firm Andrew L. Tiajloff
  • Patent number: 6672107
    Abstract: In order to provide a quartz glass crucible distinguished by high purity, high opacity and/or low transmissibility in the IR spectrum, it is proposed on the basis of a known quartz glass crucible of opaque quartz glass with a crucible body symmetrical in relation to a rotational axis, an outer zone (3) of opaque quartz glass transitioning radially toward the inside into an inner zone (2) of transparent quartz glass and with a density of at least 2.15 g/cm3, that according to the invention, the crucible body (1) be made of a synthetic SiO2 granulate with a specific BET surface ranging from 0.5 m2/g to 40 m2/g, a tamped volume of at least 0.8 g/cm3 and produced from at least partially porous agglomerates of SiO2 primary particles.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: January 6, 2004
    Assignee: Heraeus Quarzglas GmbH & Co. KG
    Inventors: Waltraud Werdecker, Johann Leist