Granted Patent
Utility
US 5,362,872 · App. 08/028,899
Chromogenic lactams
Inventors:
Hans-Peter Baumann, Rox Phaff
Patented Case
View Patent ↗
Granted: Nov 8, 1994
Filed: Mar 10, 1993
Inventors
Hans-Peter Baumann
Rox Phaff
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.