Granted Patent
Utility
US 4,312,914 · App. 06/133,159
Process for coating porous webs
Inventor:
Christian Guth
Patented Case
View Patent ↗
Granted: Jan 26, 1982
Filed: Mar 24, 1980
Inventor
Christian Guth
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.