Granted Patent
Utility
US 4,893,861 · App. 07/197,644
Drum lifter ring
Inventor:
Michael D. Stoltzman
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: May 23, 1988
Inventor
Michael D. Stoltzman
Assignee (at issue)
International Precision Components 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.