Granted Patent
Utility
US 6,312,508 · App. 09/490,708
Filter assembly for a vacuum cleaner
Inventors:
John J. Alberts, III, William H. Schmid, Scott Zaremba
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Jan 25, 2000
Inventors
John J. Alberts, III
William H. Schmid
Scott Zaremba
Assignee (at issue)
REXAIR LLC
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.