Granted Patent
Utility
US 6,161,562 · App. 09/419,225
Draw and return tube assembly and process of manufacturing the same
Inventors:
Neal L. Keefer, Kenneth A. Watson
Patented Case
View Patent ↗
Granted: Dec 19, 2000
Filed: Oct 15, 1999
Inventors
Neal L. Keefer
Kenneth A. Watson
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.