Granted Patent
Utility
US 5,352,334 · App. 07/981,740
The use of metal-free sulfo group free basic disazo compounds containing two identical 6-hydroxypyrid-2-one coupling component radicals for producing colored paper
Inventors:
Helmut Moser, Roland Wald
Patented Case
View Patent ↗
Granted: Oct 4, 1994
Filed: Nov 25, 1992
Inventors
Helmut Moser
Roland Wald
Assignee (at issue)
Sandoz AG
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.