Granted Patent
Utility
US 4,894,439 · App. 06/866,213
N-terminal derivatives of tumor necrosis factor purified by microporous PTFE membranes
Inventors:
Glenn Dorin, Wolfgang H. Hanisch, James W. Thomson, Sidney N. Wolfe, Leo S. Lin
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: May 22, 1986
Inventors
Glenn Dorin
Wolfgang H. Hanisch
James W. Thomson
Sidney N. Wolfe
Leo S. Lin
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.