Granted Patent
Utility
US 5,351,416 · App. 08/076,455
Clean air oven with heat recovery and method
Inventor:
Philip M. Witkin
Patented Case
View Patent ↗
Granted: Oct 4, 1994
Filed: Jun 14, 1993
Inventor
Philip M. Witkin
Assignee (at issue)
Marshall and Williams Company
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.