Granted Patent
Utility
US 4,352,969 · App. 06/207,211
Inductively heated rotary retort heat treating furnace
Inventor:
Karl A. Wulf
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Nov 17, 1980
Inventor
Karl A. Wulf
Assignee (at issue)
Alco Standard 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.