Granted Patent
Utility
US 4,049,931 · App. 05/581,745
Catalyst systems containing dimethylamino ether mono-ols for polyurethane foam formation
Inventors:
Michael R. Sandner, Robert D. Duffy
Patented Case
View Patent ↗
Granted: Sep 20, 1977
Filed: May 29, 1975
Inventors
Michael R. Sandner
Robert D. Duffy
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.