Granted Patent
Utility
US 4,830,962 · App. 06/578,122
Recombinant diphtheria toxin fragments
Inventors:
David H. Gelfand, Lawrence Greenfield, Frances C. Lawyer
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Feb 9, 1984
Inventors
David H. Gelfand
Lawrence Greenfield
Frances C. Lawyer
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.