Granted Patent
Utility
US 4,886,954 · App. 07/181,787
Hot wall diffusion furnace and method for operating the furnace
Inventors:
Chorng-Tao Yu, Michael A. Fisk, Alan Emami
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Apr 15, 1988
Inventors
Chorng-Tao Yu
Michael A. Fisk
Alan Emami
Assignee (at issue)
Thermco Systems, Inc.
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.