Granted Patent
Utility
US 5,487,647 · App. 08/409,384
Pneumatically powered submersible fluids pump with casing activator and biasing means
Inventor:
Michael K. Breslin
Patented Case
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Granted: Jan 30, 1996
Filed: Mar 23, 1995
Inventor
Michael K. Breslin
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.