Granted Patent
Utility
US 6,337,013 · App. 09/337,507
Removable filter with jack sealing device and vacuum cleaning heads
Inventors:
Robert Koopmans, Kevin Graydon McCauley
Patented Case
View Patent ↗
Granted: Jan 8, 2002
Filed: Jun 22, 1999
Inventors
Robert Koopmans
Kevin Graydon McCauley
Assignee (at issue)
Ontario Power Generation 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.