Granted Patent
Utility
US 4,548,626 · App. 06/605,587
Particulate air filter assembly
Inventors:
Mark William Ackley, Brian D. Szafranski
Patented Case
View Patent ↗
Granted: Oct 22, 1985
Filed: Apr 30, 1984
Inventors
Mark William Ackley
Brian D. Szafranski
Assignee (at issue)
Figgie Inernational Inc.
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.