Granted Patent
Utility
US 4,369,310 · App. 06/199,162
Bleachable dyes
Inventor:
Stephen Postle
Patented Case
View Patent ↗
Granted: Jan 18, 1983
Filed: Oct 22, 1980
Inventor
Stephen Postle
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.