Granted Patent
Utility
US 5,842,833 · App. 08/784,074
Gas separation control in a centrifugal pump vacuum pump
Inventors:
Voitto Reponen, Reijo Vesala, Vesa Vikman
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: Jan 17, 1997
Inventors
Voitto Reponen
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.