Granted Patent
Utility
US 6,082,980 · App. 08/972,499
Helical gear pump
Inventor:
Jean-Paul Papin
Patented Case
View Patent ↗
Granted: Jul 4, 2000
Filed: Nov 18, 1997
Inventor
Jean-Paul Papin
Assignee (at issue)
PCM Pompes
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.