Granted Patent
Utility
US 4,334,537 · App. 06/229,382
Drainage receptacle with anti-reflux valve
Inventor:
James J. Peterson
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Jan 28, 1981
Inventor
James J. Peterson
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.