Granted Patent
Utility
US 6,349,980 · App. 09/596,255
Joining/connector piece for corrugated pipes
Inventors:
Ernst Schwarz, Ralf Kleeb
Patented Case
View Patent ↗
Granted: Feb 26, 2002
Filed: Jun 16, 2000
Inventors
Ernst Schwarz
Ralf Kleeb
Assignee (at issue)
PMA CONSULTANTS 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.