Granted Patent
Utility
US 4,288,560 · App. 06/180,738
Process for foaming plastics
Inventors:
Rudolf Kirchmayr, Werner Fussenegger, Hugo Illy
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Aug 25, 1980
Inventors
Rudolf Kirchmayr
Werner Fussenegger
Hugo Illy
Assignee (at issue)
Ciba-Geigy
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.