Granted Patent
Utility
US 4,973,484 · App. 07/366,272
Roller mill grain preheating
Inventor:
Henry Pierik
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Jun 12, 1989
Inventor
Henry Pierik
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.