Granted Patent
Utility
US 4,459,399 · App. 06/427,138
Polyurethanes and process therefor
Inventors:
Kryn G. Ihrman, Kestutis A. Keblys, Donald H. Lucast
Patented Case
View Patent ↗
Granted: Jul 10, 1984
Filed: Sep 29, 1982
Inventors
Kryn G. Ihrman
Kestutis A. Keblys
Donald H. Lucast
Assignee (at issue)
Ethyl 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.