Granted Patent
Utility
US 5,857,618 · App. 08/864,587
Backpack sprayer with an expandable accumulator chamber
Inventor:
Mario J. Restive
Patented Case
View Patent ↗
Granted: Jan 12, 1999
Filed: May 28, 1997
Inventor
Mario J. Restive
Assignee (at issue)
D. B. Smith & Co. 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.