Granted Patent
Utility
US 6,464,816 · App. 09/128,770
Method and apparatus for making a drip irrigation hose
Inventors:
Michael DeFrank, David Marchetti, David L. Teegardin
Patented Case
View Patent ↗
Granted: Oct 15, 2002
Filed: Aug 4, 1998
Inventors
Michael DeFrank
David Marchetti
David L. Teegardin
Assignee (at issue)
T-SYSTEMS INTERNATIONAL GMBH
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.