US4749386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety filter for a vacuum cleaner
Assignee: Vorwerk and Co Interholding GmbH
•
Filing: 1987-05-04
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Granted: 1988-06-07
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Expires: 2007-05-04
Abstract
Abstract The invention is directed to a safety filter for an outlying filter cartridge of a hand-guided vacuum cleaner. The filter cartridge includes a rigid air-permeable jacket and accommodates a paper filter bag which is seated in the jacket. The safety filter is a bag corresponding to the form of the jacket and is made of electrostatically-charged non-woven fabric. The safety filter is mounted between the jacket and the paper filter bag.
Inventors
- 👤 Rolf Strohmeyer
- 👤 Horst Neugart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:42
CPC Classifications
A; A47; A47L; A47L13/00; A47L13/10; A47L13/40; A47L9/00; A47L9/10; A47L9/12; A47L9/125; A47L9/14; A47L9/1427; Y; Y10; Y10S; Y10S55/00; Y10S55/02; Y10S55/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A filter assembly for a hand-guided vacuum cleaner having a motor-blower housing and for accommodating a disposable filter bag in the assembly for collecting dust during vacuum cleaning, the filter assembly comprising: a frame adapted to be attachable to the motor-blower housing; a rigid, air-permeable jacket having a predetermined form and being attached to said frame and having an inner surface; a fabric bag made of electrostatically-charged non-woven fabric and configured to have the form of said jacket and to define a cavity for receiving the disposable filter bag therein; and, said fabric bag being attached to said frame so as to cover said entire inner surface for protecting said jacket from any dust escaping from the disposable filter bag.
Claim 2
Dependent Claim
120 words
A filter assembly for a hand-guided vacuum cleaner having a motor-blower housing and for accommodating a disposable filter bag in the assembly for collecting dust during vacuum cleaning, the filter assembly comprising: a frame adapted to be attachable to the motor-blower housing; a rigid, air-permeable jacket having a predetermined form and being attached to said frame and having an inner surface; a fabric bag made of electrostatically-charged non-woven fabric and configured to have the form of said jacket and to define a cavity for receiving the disposable filter bag therein; and, said fabric bag being attached to said frame so as to cover said entire inner surface for protecting said jacket from any dust escaping from the disposable filter bag.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |