Granted Patent
Utility
US 4,867,923 · App. 06/684,687
Process of producing foamed products
Inventors:
Barry Topcik, Austin E. Barnabeo
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Dec 21, 1984
Inventors
Barry Topcik
Austin E. Barnabeo
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.