Granted Patent
Utility
US 6,646,017 · App. 08/955,125
Process for the preparation of low-bleeding cation exchangers
Inventors:
Reinhold Klipper, Rudolf Wagner, Olaf Halle, Klaus Rall, Holger Lutjens
Patented Case
View Patent ↗
Granted: Nov 11, 2003
Filed: Oct 21, 1997
Inventors
Reinhold Klipper
Rudolf Wagner
Olaf Halle
Klaus Rall
Holger Lutjens
Assignee (at issue)
Bayer Aktiengesellschaft
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.