Granted Patent
Utility
US 4,985,491 · App. 07/417,356
Polyurethane sealants made using high molecular weight polyols prepared with double metal cyanide catalysts
Inventor:
John W. Reisch
Patented Case
View Patent ↗
Granted: Jan 15, 1991
Filed: Oct 5, 1989
Inventor
John W. Reisch
Assignee (at issue)
Olin Corporation
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.