Granted Patent
Utility
US 4,950,694 · App. 07/373,244
Preparation of polyurethane foams without using inert blowing agents
Inventor:
Stanley L. Hager
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Jun 29, 1989
Inventor
Stanley L. Hager
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.