Granted Patent
Utility
US 4,689,143 · App. 06/834,291
Drum separator
Inventor:
Robert M. Miers
Patented Case
View Patent ↗
Granted: Aug 25, 1987
Filed: Feb 26, 1986
Inventor
Robert M. Miers
Assignee (at issue)
Kimberly-Clark 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.