Granted Patent
Utility
US 6,083,407 · App. 09/220,401
Microporous diffusion apparatus
Inventor:
William B. Kerfoot
Patented Case
View Patent ↗
Granted: Jul 4, 2000
Filed: Dec 24, 1998
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.