Granted Patent
Utility
US 4,385,171 · App. 06/373,368
Removal of unreacted diisocyanate from polyurethane prepolymers
Inventors:
Wilhelm J. Schnabel, James M. O'Connor
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Apr 30, 1982
Inventors
Wilhelm J. Schnabel
James M. O'Connor
Assignee (at issue)
Olin Research Center
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.