Granted Patent
Utility
US 5,256,287 · App. 07/975,620
Cartridge filter for faucet attachment
Inventor:
David T. Underwood
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Nov 12, 1992
Inventor
David T. Underwood
Assignee (at issue)
Ametek, Inc., Plymouth Products Division
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.