Granted Patent
Utility
US 4,442,259 · App. 06/371,631
Aqueous-based polyurethane compositions and method of preparation
Inventors:
Irving E. Isgur, William D. DelVecchio
Patented Case
View Patent ↗
Granted: Apr 10, 1984
Filed: Apr 26, 1982
Inventors
Irving E. Isgur
William D. DelVecchio
Assignee (at issue)
W. R. Grace & Co.
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.