Granted Patent
Utility
US 4,380,515 · App. 06/241,807
N-Substituted 6-amino-dibenz[c,e][1,2]oxaphosphorines
Inventors:
Michael Rasberger, Samuel Evans
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Mar 9, 1981
Inventors
Michael Rasberger
Samuel Evans
Assignee (at issue)
Ciba-Geigy
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.