Granted Patent
Utility
US 5,373,068 · App. 08/124,656
Use of isophoronediamine isomer mixtures in polyaddition resins
Inventors:
Hermann Piana, Klaus Huthmacher
Patented Case
View Patent ↗
Granted: Dec 13, 1994
Filed: Sep 9, 1993
Inventors
Hermann Piana
Klaus Huthmacher
Assignee (at issue)
Degussa 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.