Granted Patent
Utility
US 4,556,706 · App. 06/144,140
Heavy metal-containing formazane dyes containing a fiber-reactive fluorotriazine group
Inventors:
Gert Hegar, Herbert Seiler
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: Apr 28, 1980
Inventors
Gert Hegar
Herbert Seiler
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.