04557739 is referenced by 21 patents and cites 10 patents.

This is concerned with a sweeper of the type that has a power operated brush that sweeps debris off of a floor or other surface to be cleaned and throws it into a hopper with a vacuum fan arranged to draw air from the hopper through a filter and exhaust it to the atmosphere. More particularly, the sweeper is provided with a precleaner and/or demister which separates the larger particles, and possibly moisture, from the airstream as it moves through the hopper, thereby protecting and/or aiding the filter.

Title
Sweeper with precleaner and/or demister
Application Number
6/644626
Publication Number
4557739
Application Date
August 27, 1984
Publication Date
December 10, 1985
Inventor
Mark D Kinter
Spring Park
MN, US
Lloyd D Fortman
Minneapolis
MN, US
Agent
Kinzer Plyer Dorn & McEachran
Assignee
Tennant Company
MN, US
IPC
B01D 50/00
View Original Source