Granted Patent
Utility
US 5,670,552 · App. 08/573,812
Foam and process for producing foam using a carbon dioxide blowing agent
Inventors:
Gerald G. Gusavage, Henry G. Schirmer, Thomas A. Hessen
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Dec 18, 1995
Inventors
Gerald G. Gusavage
Henry G. Schirmer
Thomas A. Hessen
Assignee (at issue)
W.R. Grace & Co. Conn.
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.