Granted Patent
Utility
US 4,048,727 · App. 05/677,053
Recirculating grain dryer
Inventor:
Walter Y. Botkins
Patented Case
View Patent ↗
Granted: Sep 20, 1977
Filed: Apr 14, 1976
Inventor
Walter Y. Botkins
Assignee (at issue)
Berico Industries, 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.