Granted Patent
Utility
US 4,677,197 · App. 06/792,815
Purification method for tumor necrosis factor
Inventors:
Leo S. Lin, Ralph Yamamoto
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Oct 30, 1985
Inventors
Leo S. Lin
Ralph Yamamoto
Assignee (at issue)
Cetus 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.