Granted Patent
Utility
US 5,110,331 · App. 07/691,347
Dust collector with re-entrainment prevention walls
Inventor:
Roger D. Williams
Patented Case
View Patent ↗
Granted: May 5, 1992
Filed: Apr 25, 1991
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.