US3676985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power-driven air filter
Assignee: PATENT PROTECTION Ltd
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Filing: 1970-06-04
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Granted: 1972-07-18
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Expires: 1990-06-04
Abstract
Abstract A power-driven air filter comprises a cylindrical body of fibrous or cellular material which is rotated on the shaft of an electric motor to cause contaminated air to be drawn into the front and rear faces of the body and pass through the fibrous or cellular material and so be filtered. The rotary body may be formed as a series of readily replaceable face-to-face discs, held on the shaft by push fit retaining members; and an outermost one of the discs is thinner than at least one other of said discs, with the thinner disc being discarded and replaced, when contaminated, in advance of others of said discs. An annular secondary filter in the form of an agglomeration of activated carbon may be arranged around the rotary body.
Inventors
- 👤 Christopher Roy Foreman
- 👤 Patricia Violet Shipman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:29
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/022; B; B01; B01D; B01D46/00; F04; F04D; F04D17/00; F04D17/08; F04D17/16; F04D17/167
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
260 words
A power-driven air filter comprising a rotatable shaft, a rotary body of generally cylindrical form mounted on said shaft for rotation therewith, said body comprising a plurality of separate discs extending generally radially of said shaft and mounted in contiguous relation to one another on said shaft, said discs comprising material which is at least semi-porous and having aligned central apertures through which said shaft passes to carry said discs thereon in said contiguous relation to one another, motor means for rotating said shaft and said plurality of discs on the cylinder axis of said body to draw contaminated air toward a radially extending outermost face of said cylindrical rotary body and cause said contaminated air to impinge on said discs and to be at least initially filtered as it passes radially outwards through and/or over said material, an outermost one of said plurality of discs, defining said radially extending outermost face, being thinner in a direction along the cylinder axis of said body than an adjacent thicker one of said discs, and a removable retaining member push fit onto said shaft adjacent to and in surface engagement with the radially extending outermost face of said thinner outermost one of said discs, said thinner outermost disc being readily and individually removable from said shaft by removal of said retaining member from said shaft when said outermost disc becomes contaminated during continued operation of said air filter, for replacement of said outermost disc on said shaft by a clean disc of said material disposed adjacenT the thicker one of said discs.
Claim 2
Dependent Claim
260 words
A power-driven air filter comprising a rotatable shaft, a rotary body of generally cylindrical form mounted on said shaft for rotation therewith, said body comprising a plurality of separate discs extending generally radially of said shaft and mounted in contiguous relation to one another on said shaft, said discs comprising material which is at least semi-porous and having aligned central apertures through which said shaft passes to carry said discs thereon in said contiguous relation to one another, motor means for rotating said shaft and said plurality of discs on the cylinder axis of said body to draw contaminated air toward a radially extending outermost face of said cylindrical rotary body and cause said contaminated air to impinge on said discs and to be at least initially filtered as it passes radially outwards through and/or over said material, an outermost one of said plurality of discs, defining said radially extending outermost face, being thinner in a direction along the cylinder axis of said body than an adjacent thicker one of said discs, and a removable retaining member push fit onto said shaft adjacent to and in surface engagement with the radially extending outermost face of said thinner outermost one of said discs, said thinner outermost disc being readily and individually removable from said shaft by removal of said retaining member from said shaft when said outermost disc becomes contaminated during continued operation of said air filter, for replacement of said outermost disc on said shaft by a clean disc of said material disposed adjacenT the thicker one of said discs.
Claim 3
Dependent Claim
42 words
The power-driven air filter of claim 1 including an inner supporting annulus attached to each of said discs adjacent the cylinder axis of said body in surrounding relation to the central aperture of said disc for supporting said disc on said shaft.
Claim 4
Dependent Claim
20 words
An air filter as claimed in claim 1, in which granules of activated carbon are incorporated in said rotary body.
Claim 5
Dependent Claim
20 words
An air filter as claimed in claim 1 and comprising an annular filter element mounted coaxially around said rotary body.
Claim 6
Dependent Claim
25 words
An air filter as claimed in claim 4, in which said annular filter element is stationary and comprises a porous agglomeration of activated carbon granules.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |