Granted Patent
Utility
US 6,312,598 · App. 09/495,095
Filters including filter envelopes formed from panels having different permeabilities
Inventors:
James R. Munson, Paul Roberts
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Feb 1, 2000
Inventors
James R. Munson
Paul Roberts
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.