Granted Patent
Utility
US 6,199,716 · App. 08/856,373
Ring reinforcement for conventional drum
Inventors:
Harry Mays, George Patton, Michael A. Morrison
Patented Case
View Patent ↗
Granted: Mar 13, 2001
Filed: May 14, 1997
Inventors
Harry Mays
George Patton
Michael A. Morrison
Assignee (at issue)
Grief Bros. Corporation
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.