Granted Patent
Utility
US 6,340,375 · App. 09/566,479
Air cleaner; method and use
Inventors:
Rocco A. DePietro, III, Steven A. Carter, James K. Elfstrand
Patented Case
View Patent ↗
Granted: Jan 22, 2002
Filed: May 8, 2000
Inventors
Rocco A. DePietro, III
Steven A. Carter
James K. Elfstrand
Assignee (at issue)
Donaldson Company, Inc.
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.