Granted Patent
Utility
US 4,895,621 · App. 06/932,117
Water soluble thermosetting resin, process for its production, paper sizing composition and paper sizing process
Inventor:
Thord Hassler
Patented Case
View Patent ↗
Granted: Jan 23, 1990
Filed: Nov 18, 1986
Inventor
Thord Hassler
Assignee (at issue)
W. R. Grace AB
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.