Granted Patent
Utility
US 5,227,297 · App. 07/893,620
Affinity purification ligands
Inventors:
Arun Patel, A. Hirotoshi Nishikawa
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jun 5, 1992
Inventors
Arun Patel
A. Hirotoshi Nishikawa
Assignee (at issue)
SmithKline Beecham Limited
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.