Granted Patent
Utility
US 3,939,106 · App. 05/343,180
Energy absorbing polyurethane-polyurea cellular elastomers
Inventors:
Raymond A. Dunleavy, Leslie E. Hawker
Patented Case
View Patent ↗
Granted: Feb 17, 1976
Filed: Mar 20, 1973
Inventors
Raymond A. Dunleavy
Leslie E. Hawker
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.