Granted Patent
Utility
US 6,740,147 · App. 09/848,955
Filters employing both acidic polymers and physical-adsorption media
Inventors:
Oleg P. Kishkovich, Devon Kinkead, Anatoly Grayfer, William Goodwin, David Ruede
Patented Case
View Patent ↗
Granted: May 25, 2004
Filed: May 4, 2001
Inventors
Oleg P. Kishkovich
Devon Kinkead
Anatoly Grayfer
William Goodwin
David Ruede
Assignee (at issue)
Extraction Systems, 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.