Granted Patent
Utility
US 5,323,716 · App. 08/123,396
Heater and tunnel arrangement in a material processing apparatus
Inventor:
Roger D. Eshleman
Patented Case
View Patent ↗
Granted: Jun 28, 1994
Filed: Sep 17, 1993
Inventor
Roger D. Eshleman
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.