Granted Patent
Utility
US 4,855,331 · App. 07/277,541
Production of foamed polymer structures
Inventors:
Caroll W. Lanier, H. Eugene Broemmelsiek, Raymond Lee
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Nov 28, 1988
Inventors
Caroll W. Lanier
H. Eugene Broemmelsiek
Raymond Lee
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.