Granted Patent
Utility
US 6,056,143 · App. 08/992,886
Threaded drum cover
Inventor:
Michael D. Stolzman
Patented Case
View Patent ↗
Granted: May 2, 2000
Filed: Dec 18, 1997
Inventor
Michael D. Stolzman
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.