Granted Patent
Utility
US 4,557,217 · App. 06/639,041
"Applicator for ""curtain-type pouring"" of molten plastics and the like pourable materials"
Inventor:
Hanskonrad Zingg
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Aug 9, 1984
Inventor
Hanskonrad Zingg
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.