Granted Patent
Utility
US 5,008,011 · App. 07/424,823
Shower dechlorinator using granulated copper alloy filter material
Inventor:
David T. Underwood
Patented Case
View Patent ↗
Granted: Apr 16, 1991
Filed: Oct 20, 1989
Inventor
David T. Underwood
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.