Granted Patent
Utility
US 5,247,604 · App. 07/870,839
Humidifier tank with leakage control cap
Inventor:
Bernard Chiu
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Apr 20, 1992
Inventor
Bernard Chiu
Assignee (at issue)
Duracraft Corp.
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.