Granted Patent
Utility
US 4,992,021 · App. 07/439,456
Side channel blower
Inventors:
Herbert Langen, Peter Steiner, Helmut Keinert
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Nov 20, 1989
Inventors
Herbert Langen
Peter Steiner
Helmut Keinert
Assignee (at issue)
J. Eberspacher
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.