Granted Patent
Utility
US 4,961,755 · App. 07/286,547
Coated active substances: dye coated with polyethylene oxide-propylene oxide or with ethoxylated stearyldi phenyloxyethyl diethylenetriamine
Inventors:
Beat Bruttel, Petr Kvita
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: Dec 19, 1988
Inventors
Beat Bruttel
Petr Kvita
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.