Granted Patent
Utility
US 6,120,252 · App. 09/163,387
Gas separation control in a centrifugal pump/vacuum pump
Inventors:
Voitto Reponen, Reijo Vesala, Vesa Vikman
Patented Case
View Patent ↗
Granted: Sep 19, 2000
Filed: Sep 30, 1998
Inventors
Voitto Reponen
Reijo Vesala
Vesa Vikman
Assignee (at issue)
Ahlstrom Machinery, Inc.
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.