Granted Patent
Utility
US 4,904,705 · App. 07/176,302
Polyurea foams made from N-(polyoxyalkyl)-N-(alkyl)amines
Inventors:
Richard M. Gerkin, Michael W. Jorgenson
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Mar 31, 1988
Inventors
Richard M. Gerkin
Michael W. Jorgenson
Assignee (at issue)
Union Carbide Chemicals & Plastics
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.