US3797064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter bag cleaning means
Assignee: Scott Fetzer Co
•
Filing: 1972-10-20
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Granted: 1974-03-19
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Expires: 1992-10-20
Abstract
Abstract A hardbox upright vacuum cleaner having a filter bag cleaning brush within the box which is operable by a handle projecting from the box. The filter bag is enclosed within the box and is filled with a stiffening material, such as short fibers. Dirtladen air is drawn against the outside surface of the bag so that the dirt is collected on the bag surface. The collected dirt is scraped from the bag surface by the bag cleaning brush. A removable dirt collecting box is provided beneath the bag for disposal of the dirt.
Inventors
- 👤 Farland C Mac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:23
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/20; Y; Y10; Y10S; Y10S55/00; Y10S55/02; Y10S55/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
200 words
A vacuum cleaner having a motor housing, a suction nozzle connected to said housing, an elongated filter box for filtering dirt-laden air picked up by said nozzle, first conduit means connecting said nozzle to one end of the interior of said filter box for conducting said dirt-laden air to a first portion of said interior, second conduit means connecting said motor housing to the other end of the interior of said filter box for conducting filtered air from a second portion of said interior to a fan means within said motor housing, filter means within said box and separating said first and second portions, said filter means comprising a plurality of elongated filter bags fixed at said other end of said filter box and having freely hanging distal ends extending toward said one end, said filter bags having stiffened planar faces and being arranged in spaced face-to-face apposition, brush means engaging each planar face of said filter bags adjacent said distal ends and providing the sole spacing means for those ends, and means to move said brush means along said planar faces toward the other end of said filter box to remove dirt from the surface of said filter bags.
Claim 2
Dependent Claim
200 words
A vacuum cleaner having a motor housing, a suction nozzle connected to said housing, an elongated filter box for filtering dirt-laden air picked up by said nozzle, first conduit means connecting said nozzle to one end of the interior of said filter box for conducting said dirt-laden air to a first portion of said interior, second conduit means connecting said motor housing to the other end of the interior of said filter box for conducting filtered air from a second portion of said interior to a fan means within said motor housing, filter means within said box and separating said first and second portions, said filter means comprising a plurality of elongated filter bags fixed at said other end of said filter box and having freely hanging distal ends extending toward said one end, said filter bags having stiffened planar faces and being arranged in spaced face-to-face apposition, brush means engaging each planar face of said filter bags adjacent said distal ends and providing the sole spacing means for those ends, and means to move said brush means along said planar faces toward the other end of said filter box to remove dirt from the surface of said filter bags.
Claim 3
Dependent Claim
26 words
A vacuum cleaner according to claim 1, wherein said means to move said brush means comprises a handle projecting through a wall of said filter box.
Claim 4
Dependent Claim
29 words
A vacuum cleaner according to claim 2, including a dirt box removably attached to said one end of said filter box for collecting dirt removed from said filter means.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |