Granted Patent
Utility
US 6,409,221 · App. 09/591,924
Quick locking pipe joint for round, plain, or profiled pipe
Inventors:
Michael Robinson, Thomas G. Bumala
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Jun 12, 2000
Inventors
Michael Robinson
Thomas G. Bumala
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.