Granted Patent
Utility
US 6,050,613 · App. 09/122,235
Combined plastic pipe coupler and end plug
Inventor:
Donald W. Wartluft
Patented Case
View Patent ↗
Granted: Apr 18, 2000
Filed: Jul 24, 1998
Inventor
Donald W. Wartluft
Assignee (at issue)
Continental Industries, 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.