Granted Patent
Utility
US 6,520,547 · App. 10/066,357
Quick locking pipe joint for plain or profiled pipe
Inventor:
Michael Robinson
Patented Case
View Patent ↗
Granted: Feb 18, 2003
Filed: Jan 31, 2002
Inventor
Michael Robinson
Assignee (at issue)
Phoenix Geometrix, LLC
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.