Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Reexamination Certificate
2004-11-30
2009-12-29
Griffin, Steven P (Department: 1791)
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
C065S384000, C372S006000, C385S123000
Reexamination Certificate
active
07637126
ABSTRACT:
The invention relates to a method for the economic production of a blank for a component made from laser-active quartz glass in any form or dimension. The method comprises the following method steps: a) preparation of a dispersion with a solids content of at least 40 wt. %, comprising SiO2nanopowder and doping agents, including a cation of the rare earth metals and transition metals in a fluid, b) granulation by agitation of the dispersion, with removal of moisture to form a doped SiO2granulate of spherical porous granular particles with a moisture content of less than 35 wt. % and a density of at least 0.95 g/cm3, c) drying and purification of the SiO2granulate, by heating to a temperature of at least 1000° C. to form doped porous SiO2grains with an OH content of less than 10 ppm and d) sintering or fusing the doped SiO2grains in a reducing atmosphere to give the blank made from doped quartz glass.
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Kirst Ulrich
Koeppler Rainer
Kuehn Bodo
Lehmann Walter
Werdecker Waltraud
Cohen Jodi
Griffin Steven P
Heraeus Quarzglas GmbH & Co. KG
Tiajoloff and Kelly LLP
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