Granted Patent
Utility
US 5,093,481 · App. 07/275,441
Fiber reactive azo dyestuffs
Inventors:
Hermann Henk, Karl-Josef Herd, Frank-Michael Stohr
Patented Case
View Patent ↗
Granted: Mar 3, 1992
Filed: Nov 23, 1988
Inventors
Hermann Henk
Karl-Josef Herd
Frank-Michael Stohr
Assignee (at issue)
Bayer Aktiengesellschaft
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.