Granted Patent
Utility
US 6,210,621 · App. 09/205,602
Method for making plural chambered dispensing tubes
Inventors:
Norman Usen, Thomas J. Duncan
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Dec 4, 1998
Inventors
Norman Usen
Thomas J. Duncan
Assignee (at issue)
Enamelon, 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.