Granted Patent
Utility
US 4,234,445 · App. 06/006,406
Polyurethane spray composition containing lactone viscosity modifier
Inventor:
Edward L. Hagen
Patented Case
View Patent ↗
Granted: Nov 18, 1980
Filed: Jan 25, 1979
Inventor
Edward L. Hagen
Assignee (at issue)
Uniroyal Ltd.
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.