Granted Patent
Utility
US 4,493,625 · App. 06/405,893
Grooved gear pump
Inventor:
Ferdinandus A. Pieters
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Aug 6, 1982
Inventor
Ferdinandus A. Pieters
Assignee (at issue)
Micropump, Inc.
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.