Granted Patent
Utility
US 5,849,947 · App. 08/691,222
Process for the preparation of toluylene diisocyanate, specific mixtures of toluylene diamine and water, and the use of toluylene diamine and water mixtures to prepare toluylene diisocyanate
Inventors:
Klaus Biskup, Berthold Keggenhoff
Patented Case
View Patent ↗
Granted: Dec 15, 1998
Filed: Aug 1, 1996
Inventors
Klaus Biskup
Berthold Keggenhoff
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.