Granted Patent
Utility
US 4,539,340 · App. 06/501,125
Half-ester adducts and polymer-polyols useful in the preparation of improved plastics, including polyurethane foams, elastomers and the like
Inventor:
Paul Stamberger
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Jun 6, 1983
Inventor
Paul Stamberger
Assignee (at issue)
Union Carbide 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.