Granted Patent
Utility
US 5,281,398 · App. 07/953,297
Centrifugal separator
Inventors:
Timo Hyppanen, Reijo Kuivalainen, Harry Ollila
Patented Case
View Patent ↗
Granted: Jan 25, 1994
Filed: Sep 30, 1992
Inventors
Timo Hyppanen
Reijo Kuivalainen
Harry Ollila
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.