Granted Patent
Utility
US 6,446,672 · App. 09/705,309
Flexible pipe including vent passage and method of manufacturing same
Inventors:
Mark D. Kalman, Dana Fraser
Patented Case
View Patent ↗
Granted: Sep 10, 2002
Filed: Nov 3, 2000
Inventors
Mark D. Kalman
Dana Fraser
Assignee (at issue)
Wellstream, 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.