Granted Patent
Utility
US 6,071,340 · App. 08/807,036
Apparatus for melt-level detection in Czochralski crystal growth systems
Inventor:
Zhixin Li
Patented Case
View Patent ↗
Granted: Jun 6, 2000
Filed: Feb 27, 1997
Inventor
Zhixin Li
Assignee (at issue)
General Signal Technology Corporation
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.