Patent US3871847A successfully refreshed from Google Patents.
US3871847A
Expired / Lapsed
US
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Vacuum cleaner filter
Assignee: Panasonic Corp of North America
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Filing: 1974-01-16
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Granted: 1975-03-18
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Expires: 1994-01-16
Abstract
Abstract A filter for use in a vacuum cleaner for preventing introduction of foreign objects into the fan and electric motor of the air flow means. The fan and motor are carried in a portion of the housing which defines a pervious support having an integral retainer element adapted for removably securing a filter pad in overlying relationship to the support for effectively preventing passing of foreign objects into the fan and motor.
Inventors
- 👤 Warren H Fish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:29
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/12; A47L9/122; B; B01; B01D; B01D46/00; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/03
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
155 words
In a vacuum cleaner having a housing portion defining an air flow passage having an inlet, air flow means carried by said housing portion for drawing air through said inlet and including motor means disposed in heat transfer association with the drawn air, filter means for preventing foreign objects from passing through said inlet to said air flow means thereby to prevent damage to said air flow means by said foreign objects, said filter means comprising: a substantially rigid pervious support extending transversely across said inlet and formed integrally with said air flow passage means; a retainer element formed integrally with said air flow passage means and defining a retaining shoulder overlying said support; and a removable pliant filter pad overlying said support and being retained thereto substantially solely by a portion of the filter disposed between said retainer element and support and the air drawn through the filter pad by said air flow means.
Claim 2
Dependent Claim
155 words
In a vacuum cleaner having a housing portion defining an air flow passage having an inlet, air flow means carried by said housing portion for drawing air through said inlet and including motor means disposed in heat transfer association with the drawn air, filter means for preventing foreign objects from passing through said inlet to said air flow means thereby to prevent damage to said air flow means by said foreign objects, said filter means comprising: a substantially rigid pervious support extending transversely across said inlet and formed integrally with said air flow passage means; a retainer element formed integrally with said air flow passage means and defining a retaining shoulder overlying said support; and a removable pliant filter pad overlying said support and being retained thereto substantially solely by a portion of the filter disposed between said retainer element and support and the air drawn through the filter pad by said air flow means.
Claim 3
Dependent Claim
21 words
The vacuum cleaner filter means of claim 1 wherein said retainer element is disposed substantially at the center of said support.
Claim 4
Dependent Claim
20 words
The vacuum cleaner filter means of claim 1 wherein said retainer element comprises a T-shaped element upstanding from said support.
Claim 5
Dependent Claim
18 words
The vacuum cleaner filter means of claim 1 wherein said retainer element is formed integrally with said support.
Claim 6
Dependent Claim
13 words
The vacuum filter means of claim 1 wherein said support is upwardly convex.
Claim 7
Dependent Claim
58 words
The vacuum cleaner filter means of claim 1 wherein said support defines an annular, upwardly opening peripheral channel underlying the circumferential edge of the filter pad, the air passing through the filter pad urging the pad firmly against the support along said channel and thereby substantially precluding air from bypassing around the circumferential edge of the filter pad.
Claim 8
Dependent Claim
201 words
In a vacuum cleaner having a housing portion defining an air flow passage having an inlet, air flow means carried by said housing portion for drawing air through said inlet and including motor means disposed in heat transfer association with the drawn air, filter means for preventing foreign objects from passing through said inlet to said air flow means by said foreign objects, said filter means comprising: a substantially rigid pervious support extending transversely across said inlet and formed integrally with said air flow passage means; a retainer element formed integrally with said air flow paSsage means and defining a retaining shoulder overlying said support; a removable pliant filter pad overlying said support and being retained thereto substantially solely by a portion of the filter disposed between said retainer and support and the air drawn through the filter pad by said air flow means; and means for sealing the air flow means to said housing portion adjacent said pervious support for causing substantially all air drawn through said air flow means to be discharged from said vacuum cleaner and thereby urge said filter pad against said support to effectively preclude removal of said filter portion from between said retainer and support.
Claim 9
Dependent Claim
201 words
In a vacuum cleaner having a housing portion defining an air flow passage having an inlet, air flow means carried by said housing portion for drawing air through said inlet and including motor means disposed in heat transfer association with the drawn air, filter means for preventing foreign objects from passing through said inlet to said air flow means by said foreign objects, said filter means comprising: a substantially rigid pervious support extending transversely across said inlet and formed integrally with said air flow passage means; a retainer element formed integrally with said air flow paSsage means and defining a retaining shoulder overlying said support; a removable pliant filter pad overlying said support and being retained thereto substantially solely by a portion of the filter disposed between said retainer and support and the air drawn through the filter pad by said air flow means; and means for sealing the air flow means to said housing portion adjacent said pervious support for causing substantially all air drawn through said air flow means to be discharged from said vacuum cleaner and thereby urge said filter pad against said support to effectively preclude removal of said filter portion from between said retainer and support.
Claim 10
Dependent Claim
56 words
The vacuum cleaner filter means of claim 7 wherein said support defines an annular peripheral channel underlying the circumferential edge of the filter pad, the air passing through the filter pad urging the pad firmly against the support along said channel and thereby substantially precluding air from bypassing around the circumferential edge of the filter pad.
Claim 11
Dependent Claim
34 words
The vacuum cleaner filter means of claim 7 wherein said vacuum cleaner comprises a canister type vacuum cleaner having a base portion and said housing portion comprises an integral portion of said base portion.
Claim 12
Dependent Claim
45 words
The vacuum cleaner filter means of claim 7 wherein said vacuum cleaner includes a dirt collecting bag spaced substantially from said inlet, and means for conducting the drawn air through the dirt collecting bag before delivery thereof to said inlet of said air flow passage.
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |