Granted Patent
Utility
US 4,198,488 · App. 05/919,064
Polymer-polyols and polyurethanes based thereon
Inventors:
Kenneth C. Drake, Kenneth L. Hoy, Carl G. Seefried, Jr.
Patented Case
View Patent ↗
Granted: Apr 15, 1980
Filed: Jun 26, 1978
Inventors
Kenneth C. Drake
Kenneth L. Hoy
Carl G. Seefried, Jr.
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.