Granted Patent
Utility
US 5,855,775 · App. 08/756,273
Microporous diffusion apparatus
Inventor:
William B. Kerfoot
Patented Case
View Patent ↗
Granted: Jan 5, 1999
Filed: Nov 25, 1996
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.