Granted Patent
Utility
US 6,022,388 · App. 09/091,056
Device for cleaning filter elements
Inventors:
Bernt Andersson, Ulf Alterby
Patented Case
View Patent ↗
Granted: Feb 8, 2000
Filed: Jun 9, 1998
Inventors
Bernt Andersson
Ulf Alterby
Assignee (at issue)
ABB Flakt AB
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.