Granted Patent
Utility
US 4,981,413 · App. 07/344,306
Pump for and method of separating gas from a fluid to be pumped
Inventors:
Jorma Elonen, Jukka Timperi, Reijo Vesala, Vesa Vikman
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: Apr 27, 1989
Inventors
Jorma Elonen
Jukka Timperi
Reijo Vesala
Vesa Vikman
Assignee (at issue)
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.