Granted Patent
Utility
US 4,926,518 · App. 07/219,956
Plastic drain auger
Inventor:
Erwin F. Mikol
Patented Case
View Patent ↗
Granted: May 22, 1990
Filed: Jul 15, 1988
Inventor
Erwin F. Mikol
Assignee (at issue)
Twentieth Century Companies, 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.