Granted Patent
Utility
US 6,402,605 · App. 09/749,290
Drilling device for brittle materials
Inventors:
Uwe Christiansen, Henning Bierstedt
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Dec 27, 2000
Inventors
Uwe Christiansen
Henning Bierstedt
Assignee (at issue)
Hecaeus 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.