Granted Patent
Utility
US 4,698,120 · App. 06/823,823
Barrier for quartz crucible for drawing silicon dendritic web and method of use
Inventor:
William C. Higginbotham
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Jan 28, 1986
Inventor
William C. Higginbotham
Assignee (at issue)
Westinghouse Electric Company LLC
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.