Granted Patent
Utility
US 6,436,285 · App. 09/470,167
Laminated microporous diffuser
Inventor:
William B. Kerfoot
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Dec 22, 1999
Inventor
William B. Kerfoot
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.