Granted Patent
Utility
US 4,914,834 · App. 07/336,135
Grain dryer
Inventor:
Sylvan H. Sime
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Apr 11, 1989
Inventor
Sylvan H. Sime
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.