Granted Patent
Utility
US 5,126,480 · App. 07/531,618
Isocyanate preparation
Inventors:
John A. Sofranko, Anne Mae Gaffney
Patented Case
View Patent ↗
Granted: Jun 30, 1992
Filed: Jun 1, 1990
Inventors
John A. Sofranko
Anne Mae Gaffney
Assignee (at issue)
Arco Chemical Technology, L.P.
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.