Granted Patent
Utility
US 4,477,644 · App. 06/520,980
Reaction injection molded polyurethanes employing thiapolycyclic polyahls as chain extenders
Inventors:
Tonja R. Sutton, David W. Hughes
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Aug 8, 1983
Inventors
Tonja R. Sutton
David W. Hughes
Assignee (at issue)
THE DOW CHEMICAL 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.