Granted Patent
Utility
US 5,114,310 · App. 07/579,403
Centrifugal pump with sealing means
Inventors:
Harold K. Haavik, Tapio Peroaho, Reijo Vesala, Vesa Vikman
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Sep 7, 1990
Inventors
Harold K. Haavik
Tapio Peroaho
Reijo Vesala
Vesa Vikman
Assignee (at issue)
A. 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.