Granted Patent
Utility
US 4,328,828 · App. 06/187,909
Drainage system with vent
Inventor:
James P. Cianci
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: Sep 17, 1980
Inventor
James P. Cianci
Assignee (at issue)
The Kendall Company LP
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.