Granted Patent
Utility
US 4,135,477 · App. 05/772,335
Curtain coating apparatus
Inventor:
Kenneth A. Ridley
Patented Case
View Patent ↗
Granted: Jan 23, 1979
Filed: Feb 25, 1977
Inventor
Kenneth A. Ridley
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.