Granted Patent
Utility
US 5,162,110 · App. 07/629,833
Binding theophylline to ion exchange resins
Inventors:
Mark P. Warchol, Zofia J. Chrzan
Patented Case
View Patent ↗
Granted: Nov 10, 1992
Filed: Dec 19, 1990
Inventors
Mark P. Warchol
Zofia J. Chrzan
Assignee (at issue)
Rhone-Poulenc Rorer Pharmaceuticals 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.