US3969095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter apparatus
Assignee: Individual
•
Filing: 1974-08-23
•
Granted: 1976-07-13
•
Expires: 1994-08-23
Abstract
Abstract An air filter apparatus comprising an inner sleeve having a number of small apertures, an externally tapered outer sleeve having a number of small apertures, said inner sleeve being inserted in said outer sleeve and fixed in position to form a double-wall cylinder, a funnel-shaped suction port disposed at the mouth edge of the inner sleeve on the side where the larger diameter of the outer sleeve exists and active carbon packed in a space between the inner and outer sleeves.
Inventors
- 👤 Shigeru Kurahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:16
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0039; B01D46/0041; B01D46/0043; B01D46/24; B01D46/2403; B01D46/2411; B01D46/30; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0431; B01D53/0446; F; F24; F24F; F24F13/00; F24F13/28; B01D2253/00; B01D2253/10; B01D2253/102; B01D2257/00; B01D2257/90; B01D2257/91; B01D2259/00; B01D2259/45; B01D2259/4508; B01D2275/00; B01D2275/20; B01D2275/201
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
196 words
An apparatus for use in the filtration of air which comprises a frusto-conically shaped inner sleeve defining a central zone and containing a plurality of small apertures and a frusto-conically shaped outer sleeve containing a plurality of small apertures, the number of said small apertures per unit area being gradually increased from the rear end toward the front end of said inner and outer sleeves, said inner sleeve being coaxially disposed within and spaced apart from said outer sleeve and defining therebetween a space which is adapted to contain a filter material, said space being closed at the front end with an attachment plate member which connects the inner and outer sleeves, and the rear end of the inner sleeve being closed by a rear plate and the rear end of the outer sleeve being closed by a removable cover, said inner and outer frusto-conically shaped sleeves being cover, said inner and outer frusto-conically shaped sleeves being tapered from the front end thereof having the larger diameter to the rear end thereof having the smaller diameter, and a funnel-shaped suction port disposed at the inlet end of the central zone and associated with the inner sleeve.
Claim 2
Independent Claim
196 words
An apparatus for use in the filtration of air which comprises a frusto-conically shaped inner sleeve defining a central zone and containing a plurality of small apertures and a frusto-conically shaped outer sleeve containing a plurality of small apertures, the number of said small apertures per unit area being gradually increased from the rear end toward the front end of said inner and outer sleeves, said inner sleeve being coaxially disposed within and spaced apart from said outer sleeve and defining therebetween a space which is adapted to contain a filter material, said space being closed at the front end with an attachment plate member which connects the inner and outer sleeves, and the rear end of the inner sleeve being closed by a rear plate and the rear end of the outer sleeve being closed by a removable cover, said inner and outer frusto-conically shaped sleeves being cover, said inner and outer frusto-conically shaped sleeves being tapered from the front end thereof having the larger diameter to the rear end thereof having the smaller diameter, and a funnel-shaped suction port disposed at the inlet end of the central zone and associated with the inner sleeve.
Claim 3
Dependent Claim
33 words
The apparatus of claim 1, wherein an elastic member is disposed inside of said rear end between said cover and such filter material, thereby preventing movement of such filter material due to vibration.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1, used in plurality and mounted in juxtaposition on a base plate.
Claim 5
Dependent Claim
55 words
The apparatus of claim 1, wherein the funnel-shaped suction port is provided with a neck portion which is in screw engagement with the inner sleeve, said funnel-shaped suction port being integrally provided with a fixture plate, said fixture plate being fixed to a base plate which is disposed at the front end of the apparatus.
Claim 6
Dependent Claim
29 words
The apparatus of claim 4, wherein the funnel-shaped suction port defines an inlet area substantially larger than the inlet area of the central zone defined by said inner sleeve.
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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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |