Patent US5248323A successfully refreshed from Google Patents.
US5248323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner and filter thereof
Assignee: HMI Industries Inc
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Filing: 1992-11-09
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Granted: 1993-09-28
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Expires: 2012-11-09
Abstract
Abstract In a vacuum cleaner comprising a reduced velocity chamber with a high velocity air inlet, an electric motor, a rotary means driven by the motor for creating a vacuum in the chamber, an outlet for exhausting air from the chamber, which air flows in a selected path from the air inlet, through the chamber and out the air exhaust outlet and a disposable porous sheet filter layer in the chamber for removing solids particles from the air there is provided an improvement comprising a gas removing filter between the filter layer and the motor where the gas removing filter comprises an activated charcoal filter layer in the chamber, intersecting the air path and generally coterminous with the disposable filter layer.
Inventors
- 👤 Philip H. Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:36
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/12; A47L9/125; A47L9/16; A47L9/1658; A47L9/1666; B; B01; B01D; B01D46/00; B01D46/0027; B01D46/0036; B01D46/24; B01D46/56; B01D46/62; B01D46/64; B01D50/00; B01D50/20; B01D2275/00; B01D2275/20; B01D2275/201; B01D2279/00; B01D2279/55; Y; Y10; Y10S; Y10S55/00; Y10S55/03
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
166 words
In a vacuum cleaner comprising a reduced velocity chamber with a high velocity air inlet, an electric motor, a rotary means driven by said motor for creating a vacuum in said chamber, an outlet for exhausting air from said chamber, which air flows in a selected path from said air inlet, through said chamber and out said air exhaust outlet and a disposable porous sheet filter layer in said chamber for removing solid particles from said air, said chamber retaining particle settling out from said air, said filter layer intersecting said air path, the improvement comprising: a gas removing filter between said filter layer and said motor said disposable filter layer and said carbon filter layer both being generally conical in shape, said gas removing filter comprising an activated charcoal filter layer in said chamber, intersecting said air path and generally coterminous with said disposable filter layer, and means for supporting said filter layers in a nested relationship and maintaining said filter layers generally conical shape.
Claim 2
Dependent Claim
166 words
In a vacuum cleaner comprising a reduced velocity chamber with a high velocity air inlet, an electric motor, a rotary means driven by said motor for creating a vacuum in said chamber, an outlet for exhausting air from said chamber, which air flows in a selected path from said air inlet, through said chamber and out said air exhaust outlet and a disposable porous sheet filter layer in said chamber for removing solid particles from said air, said chamber retaining particle settling out from said air, said filter layer intersecting said air path, the improvement comprising: a gas removing filter between said filter layer and said motor said disposable filter layer and said carbon filter layer both being generally conical in shape, said gas removing filter comprising an activated charcoal filter layer in said chamber, intersecting said air path and generally coterminous with said disposable filter layer, and means for supporting said filter layers in a nested relationship and maintaining said filter layers generally conical shape.
Claim 3
Dependent Claim
36 words
The improvement as defined in claim 1 including a second filter layer for removing solid particles, said second filter layer being a porous sheet intersecting said air path between said charcoal filter layer and said motor.
Claim 4
Dependent Claim
33 words
The improvement as defined in claim 2 wherein said chamber includes centrifugal filter means for causing said air path to flow in circular convolutions from said air inlet to said porous filter layer.
Claim 5
Dependent Claim
33 words
The improvement as defined in claim 1 wherein said chamber includes centrifugal filter means for causing said air path to flow in circular convolutions from said air inlet to said porous filter layer.
Claim 6
Dependent Claim
27 words
The improvement as defined in claim 4 including means for releasably supporting said disposable filter layer and said charcoal filter layer into a composite dual filter cone.
Claim 7
Dependent Claim
27 words
The improvement as defined in claim 2 including means for releasably supporting said disposable filter layer and said charcoal filter layer into a composite dual filter cone.
Claim 8
Dependent Claim
27 words
The improvement as defined in claim 1 including means for releasably supporting said disposable filter layer and said charcoal filter layer into a composite dual filter cone.
Claim 9
Dependent Claim
20 words
The improvement as defined in claim 7 wherein said charcoal filter layer is a non-woven mat impregnated with activated carbon.
Claim 10
Dependent Claim
19 words
The improvement as defined in claim 8, wherein said filter layer has a thickness less than about 1/2 inch.
Claim 11
Dependent Claim
18 words
The improvement as defined in claim 9 wherein said filter layer has a thickness of about 1/4 inch.
Claim 12
Dependent Claim
13 words
The improvement as defined in claim 8, wherein said mat is non-woven polyester.
Claim 13
Dependent Claim
20 words
The improvement as defined in claim 4 wherein said charcoal filter layer is a non-woven mat impregnated with activated carbon.
Claim 14
Dependent Claim
20 words
The improvement as defined in claim 2 wherein said charcoal filter layer is a non-woven mat impregnated with activated carbon.
Claim 15
Dependent Claim
20 words
The improvement as defined in claim 1 wherein said charcoal filter layer is a non-woven mat impregnated with activated carbon.
Claim 16
Dependent Claim
19 words
The improvement as defined in claim 7 wherein said support means includes a rigid cone formed of perforated material.
Claim 17
Dependent Claim
28 words
The improvement as defined in claim 15 wherein said perforated material has spaced inwardly facing rib means for pressing said charcoal filter layer against said disposable filter layer.
Claim 18
Dependent Claim
28 words
The improvement as defined in claim 14 wherein said perforated material has spaced inwardly facing rib means for pressing said charcoal filter layer against said disposable filter layer.
Claim 19
Dependent Claim
160 words
A gas filter for use in a vacuum cleaner having a reduced-velocity chamber with a high-velocity air inlet, an electric motor, a rotary means driven by said motor for creating a vacuum in said chamber, an outlet for exhausting air from said chamber, which air flows in a selected path from said air inlet, through said chamber and out said air exhaust outlet and a disposable porous sheet filter layer in said chamber for removing solid particles from said air, said chamber includes centrifugal means for causing said air path to flow in circular convolutions and retain particles settling out from said air, said porous sheet filter intersecting said air path, said gas filter having a conical shape and adapted to be positioned between said chamber air inlet and said electric motor and comprising an activated charcoal layer in the form of a mat impregnated with activated carbon, said impregnated mat having a thickness of less than about 1/2 inch.
Claim 20
Dependent Claim
160 words
A gas filter for use in a vacuum cleaner having a reduced-velocity chamber with a high-velocity air inlet, an electric motor, a rotary means driven by said motor for creating a vacuum in said chamber, an outlet for exhausting air from said chamber, which air flows in a selected path from said air inlet, through said chamber and out said air exhaust outlet and a disposable porous sheet filter layer in said chamber for removing solid particles from said air, said chamber includes centrifugal means for causing said air path to flow in circular convolutions and retain particles settling out from said air, said porous sheet filter intersecting said air path, said gas filter having a conical shape and adapted to be positioned between said chamber air inlet and said electric motor and comprising an activated charcoal layer in the form of a mat impregnated with activated carbon, said impregnated mat having a thickness of less than about 1/2 inch.
Claim 21
Dependent Claim
20 words
The gas filter as defined in claim 18, wherein said gas filter is generally coterminous with said porous sheet filter.
Claim 22
Dependent Claim
16 words
The gas filter as defined in claim 18, wherein said mat is a non-woven polyester material.
Claim 23
Dependent Claim
16 words
The gas filter as defined in claim 20, wherein said mat is a non-woven polyester material.
Claim 24
Dependent Claim
18 words
The gas filter as defined in claim 18, wherein said polyester material is a high-surface area, spongy material.
Claim 25
Dependent Claim
18 words
The gas filter as defined in claim 21, wherein said polyester material is a high-surface area, spongy material.
Claim 26
Dependent Claim
14 words
The gas filter as defined in claim 18, wherein said gas filter is disposable.
Claim 27
Dependent Claim
14 words
The gas filter as defined in claim 23, wherein said gas filter is disposable.
Claim 28
Dependent Claim
23 words
The gas filter as defined in claim 18, wherein a secondary particle filter is positioned between said gas filter and said electric motor.
Claim 29
Dependent Claim
23 words
The gas filter as defined in claim 25, wherein a secondary particle filter is positioned between said gas filter and said electric motor.
Claim 30
Dependent Claim
19 words
The gas filter as defined in claim 18, wherein said gas filter is positioned between two particle filter layers.
Claim 31
Dependent Claim
19 words
The gas filter as defined in claim 27, wherein said gas filter is positioned between two particle filter layers.
Claim 32
Dependent Claim
33 words
The gas filter as defined in claim 18, wherein said gas filter is in a nested relationship with a support means, said support means maintaining said gas filter in a generally conical shape.
Claim 33
Dependent Claim
33 words
The gas filter as defined in claim 27, wherein said gas filter is in a nested relationship with a support means, said support means maintaining said gas filter in a generally conical shape.
Claim 34
Dependent Claim
30 words
The gas filter as defined in claim 30, wherein said support means includes a rigid cone having spaced, inwardly-facing rib means for maintaining said gas filter in a conical shape.
Claim 35
Dependent Claim
30 words
The gas filter as defined in claim 31, wherein said support means includes a rigid cone having spaced, inwardly-facing rib means for maintaining said gas filter in a conical shape.
Claim 36
Independent Claim
104 words
A method of cleaning air by use of a canister type vacuum cleaning including the steps of: (a) drawing air through a high velocity air inlet into a low velocity chamber; (b) centrifuging the air in the low velocity chamber to remove solid particles; (c) passing said air through a conical composite filter including a first solid particle removing filter layer and a second filter layer of activated charcoal for removing gases from said air; (d) then passing said air through a filter layer for removing solids, such as carbon particles; and, (e) forcing said air past said motor and out an air outlet.
Claim 37
Independent Claim
104 words
A method of cleaning air by use of a canister type vacuum cleaning including the steps of: (a) drawing air through a high velocity air inlet into a low velocity chamber; (b) centrifuging the air in the low velocity chamber to remove solid particles; (c) passing said air through a conical composite filter including a first solid particle removing filter layer and a second filter layer of activated charcoal for removing gases from said air; (d) then passing said air through a filter layer for removing solids, such as carbon particles; and, (e) forcing said air past said motor and out an air outlet.
Claim 38
Dependent Claim
39 words
A method of cleaning air as defined in claim 34 wherein said means for supporting includes a filter support nested in said carbon filter to maintain said conical shape of said filter as said air passes through said filter.
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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) | 1996-09-27 | 1997-03-29 | 1997-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-27 | 2001-03-29 | 2001-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-27 | 2005-03-29 | 2005-09-28 | $7700.00 | Window Closed / Lapsed |