Granted Patent
Utility
US 5,518,343 · App. 08/410,637
Dust-free powder substance delivery and filter system
Inventor:
William A. Howell
Patented Case
View Patent ↗
Granted: May 21, 1996
Filed: Mar 24, 1995
Inventor
William A. Howell
Assignee (at issue)
Carl A. Dengel
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.