Dual filter vacuum cleaner apparatus
USRE40542E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2005 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Apr 15, 2025 |
Classification
- Technology area (CPC —)General
Abstract
A dual filter arrangement for a vacuum cleaner for filtering particles of dust and debris from an airflow passing through the vacuum cleaner. The dual filter comprises a coarse pre-filter having an array of pores formed therein of substantially uniform diameter and a fine primary filter which is located rearwardly of the pre-filter in the direction of flow of the airflow. The dual filter is releasably latched to a main housing portion of the vacuum cleaner housing. A nose cone is removably secured to the housing and circumscribes the dual filter assembly. The dual filter enables even more efficient filtering of contaminants from dust and dirt entrained air ingested by the vacuum cleaner. Attachment of the dual filter to the main housing portion provides the additional advantage of increasing the capacity of the nose cone and eliminating the need for the user to handle the dual filter assembly when emptying contaminants collected within the nose cone. A unique seal arrangement provides a substantially airtight seal between the dual filter system and the main housing to which it is secured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.