Granted Patent
Utility
US 4,846,669 · App. 07/193,836
Continuous material heating oven
Inventor:
Hans L. Melgaard
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: May 13, 1988
Inventor
Hans L. Melgaard
Assignee (at issue)
Despatch Industries Limited Partnership
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.