Granted Patent
Utility
US 5,855,324 · App. 08/000,905
Drip irrigation hose and method of its manufacture
Inventors:
Michael DeFrank, Wayne Hackman, Shawn Shirvan
Patented Case
View Patent ↗
Granted: Jan 5, 1999
Filed: Dec 30, 1997
Inventors
Michael DeFrank
Wayne Hackman
Shawn Shirvan
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.