Granted Patent
Utility
US 5,019,136 · App. 07/336,208
Method and apparatus for separating gas with a pump from a medium being pumped
Inventors:
Jorma Elonen, Jukka Timperi, Reijo Vesala, Vesa Wikman
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Apr 11, 1989
Inventors
Jorma Elonen
Jukka Timperi
Reijo Vesala
Vesa Wikman
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.