Granted Patent
Utility
US 4,578,446 · App. 06/715,719
Secondary aromatic diamines as curing agents in polyurethane manufacturing
Inventors:
David W. House, Ray V. Scott, Jr.
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Mar 25, 1985
Inventors
David W. House
Ray V. Scott, Jr.
Assignee (at issue)
UOP LLC
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.