Granted Patent
Utility
US 6,042,645 · App. 09/177,269
Method for independently supporting the pull head of a czochralski crystal growing system
Inventor:
Zhixin Li
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Oct 22, 1998
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.