Granted Patent
Utility
US 5,879,452 · App. 08/786,878
Czochralski crystal growth system with an independently supported pull head
Inventor:
Zhixin Li
Patented Case
View Patent ↗
Granted: Mar 9, 1999
Filed: Jan 23, 1997
Inventor
Zhixin Li
Assignee (at issue)
Ferrofluidics 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.