Granted Patent
Utility
US 5,019,639 · App. 07/503,399
Novel epoxy resins
Inventors:
Arnold Hofer, Alex Wegmann
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Apr 2, 1990
Inventors
Arnold Hofer
Alex Wegmann
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.