Granted Patent
Utility
US 6,355,079 · App. 09/585,090
Production method for multilayer filter material and multilayer filter material
Inventors:
Juha Sorvari, Kaj Lindblad
Patented Case
View Patent ↗
Granted: Mar 12, 2002
Filed: Jun 1, 2000
Inventors
Juha Sorvari
Kaj Lindblad
Assignee (at issue)
BKI Holding 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.