Granted Patent
Utility
US 4,971,519 · App. 07/366,699
Method and apparatus for pumping high consistency medium
Inventors:
Jukka Timperi, Reijo Vesala, Vesa Vikman
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Jun 15, 1989
Inventors
Jukka Timperi
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.