Granted Patent
Utility
US 6,491,873 · App. 09/767,500
Multi-well filtration apparatus
Inventors:
Roger Q. Roberts, Michael R. Woelk
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Jan 23, 2001
Inventors
Roger Q. Roberts
Michael R. Woelk
Assignee (at issue)
Varian, 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.