Granted Patent
Utility
US 6,516,636 · App. 09/601,460
Method for producing a tube made of quartz glass using low internal pressure and control of diameters
Inventors:
Frank Gänsicke, Oliver Ganz, Harald Hain, Thomas Bogdahn, Oliver Humbach
Patented Case
View Patent ↗
Granted: Feb 11, 2003
Filed: Aug 2, 2000
Inventors
Frank Gänsicke
Oliver Ganz
Harald Hain
Thomas Bogdahn
Oliver Humbach
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.