Granted Patent
Utility
US 5,905,151 · App. 08/018,830
Trimer catalyst for aliphatic and aromatic isocyanates
Inventors:
William E. Slack, Hersel T. Kemp, II
Patented Case
View Patent ↗
Granted: May 18, 1999
Filed: Feb 18, 1993
Inventors
William E. Slack
Hersel T. Kemp, II
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.