Granted Patent
Utility
US 5,298,651 · App. 07/961,238
Process for preparing isocyanates using phosphazine catalysts
Inventors:
William D. McGhee, Thomas E. Waldman
Patented Case
View Patent ↗
Granted: Mar 29, 1994
Filed: Oct 15, 1992
Inventors
William D. McGhee
Thomas E. Waldman
Assignee (at issue)
Monsanto Company
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.