Granted Patent
Utility
US 5,722,702 · App. 08/631,248
Plastic pipe compression coupler
Inventor:
Robert B. Washburn
Patented Case
View Patent ↗
Granted: Mar 3, 1998
Filed: Apr 12, 1996
Inventor
Robert B. Washburn
Assignee (at issue)
Arnco
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.