Granted Patent
Utility
US 5,346,519 · App. 08/053,602
Filter media construction
Inventor:
Roger D. Williams
Patented Case
View Patent ↗
Granted: Sep 13, 1994
Filed: Apr 27, 1993
Inventor
Roger D. Williams
Assignee (at issue)
Pneumafil Corporation
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.