Granted Patent
Utility
US 6,419,472 · App. 09/776,108
Gear unit for a deep-borehole pump
Inventor:
Erwin Kobensen
Patented Case
View Patent ↗
Granted: Jul 16, 2002
Filed: Feb 2, 2001
Inventor
Erwin Kobensen
Assignee (at issue)
A. Friedr. Flender Aktiengessellschaft
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.