Granted Patent
Utility
US 5,701,683 · App. 08/748,588
Counter flow cooler
Inventor:
Donald M. Wilhelm
Patented Case
View Patent ↗
Granted: Dec 30, 1997
Filed: Nov 13, 1996
Inventor
Donald M. Wilhelm
Assignee (at issue)
California Pellet Mill 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.