Granted Patent
Utility
US 4,476,258 · App. 06/480,493
Energy absorbing polyurethane compositions
Inventor:
Maurice Hiles
Patented Case
View Patent ↗
Granted: Oct 9, 1984
Filed: Mar 30, 1983
Inventor
Maurice Hiles
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.