Granted Patent
Utility
US 6,544,769 · App. 09/249,646
Compostions comprising viruses and methods for concentrating virus preparations
Inventors:
Andreas Frei, Henry K.H. Kwan, Varda Sandweiss, Gary Vellekamp, Pui-Ho Yuen, Peter M. Ihnat
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Feb 12, 1999
Inventors
Andreas Frei
Henry K.H. Kwan
Varda Sandweiss
Gary Vellekamp
Pui-Ho Yuen
Peter M. Ihnat
Assignee (at issue)
SCHERING CORPORATION
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.