Granted Patent
Utility
US 5,116,198 · App. 07/579,406
Centrifugal pumping apparatus
Inventors:
Reijo Vesala, Vesa Vikman
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Sep 7, 1990
Inventors
Reijo Vesala
Vesa Vikman
Assignee (at issue)
Ahlstrom Corporation
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.