Granted Patent
Utility
US 6,581,780 · App. 09/758,992
Automatic gradation unit
Inventors:
Herbert E. Jakob, Michael E. Barrett, Gary Heeszel, David F. Peaks
Patented Case
View Patent ↗
Granted: Jun 24, 2003
Filed: Jan 16, 2001
Inventors
Herbert E. Jakob
Michael E. Barrett
Gary Heeszel
David F. Peaks
Assignee (at issue)
AI Enterprises, 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.