Granted Patent
Utility
US 6,321,573 · App. 09/328,751
Process and apparatus for manufacturing a porous SiO2 preform
Inventors:
Hans-Georg Fritsche, Udo Peper, Frank Neubauer, Hartwig Schaper, Jurgen Roper
Patented Case
View Patent ↗
Granted: Nov 27, 2001
Filed: Jun 9, 1999
Inventors
Hans-Georg Fritsche
Udo Peper
Frank Neubauer
Hartwig Schaper
Jurgen Roper
Assignee (at issue)
HERAEUS QUARZGLAS GMBH & CO. KG
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.