Granted Patent
Utility
US 5,824,149 · App. 08/807,400
Method and apparatus for controlling crystal temperature gradients in crystal growing systems
Inventor:
Zhixin Li
Patented Case
View Patent ↗
Granted: Oct 20, 1998
Filed: Feb 27, 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.