Granted Patent
Utility
US 6,059,851 · App. 09/146,450
Air cleaner; method and use
Inventors:
Rocco A. DePietro, III, Steven A. Carter, James K. Elfstrand
Patented Case
View Patent ↗
Granted: May 9, 2000
Filed: Sep 3, 1998
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.