Granted Patent
Utility
US 4,877,368 · App. 07/268,599
Fluidizing centrifugal pump
Inventors:
Jukka Timperi, Reijo Vesala, Vesa Vikman
Patented Case
View Patent ↗
Granted: Oct 31, 1989
Filed: Nov 8, 1988
Inventors
Jukka Timperi
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.