Granted Patent
Utility
US 6,502,422 · App. 09/697,904
Method for quartz crucible fabrication
Inventors:
Richard L. Hansen, Frederic F. Ahlgren, Robert Arthur Giddings
Patented Case
View Patent ↗
Granted: Jan 7, 2003
Filed: Oct 27, 2000
Inventors
Richard L. Hansen
Frederic F. Ahlgren
Robert Arthur Giddings
Assignee (at issue)
General Electric Company
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.