Granted Patent
Utility
US 5,458,665 · App. 08/089,814
Apparatus for filtering gases
Inventors:
Gary Martin, Pekka Lehtonen
Patented Case
View Patent ↗
Granted: Oct 17, 1995
Filed: Jul 12, 1993
Inventors
Gary Martin
Pekka Lehtonen
Assignee (at issue)
A. Ahlstrom 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.