GB2057911A - Dust filter apparatus - Google Patents
Dust filter apparatus Download PDFInfo
- Publication number
- GB2057911A GB2057911A GB7929502A GB7929502A GB2057911A GB 2057911 A GB2057911 A GB 2057911A GB 7929502 A GB7929502 A GB 7929502A GB 7929502 A GB7929502 A GB 7929502A GB 2057911 A GB2057911 A GB 2057911A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- liquid
- gaseous flow
- gaseous
- panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000428 dust Substances 0.000 title claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 106
- 230000001939 inductive effect Effects 0.000 claims abstract description 34
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 25
- 230000003584 silencer Effects 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- 238000011045 prefiltration Methods 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 5
- 230000003252 repetitive effect Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000007921 spray Substances 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007689 inspection Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/20—Drawing-off or depositing dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Dust filter apparatus comprises a chamber (2) defining a gaseous flow duct across which is arranged a dust filter panel (18), gaseous flow inducing means (8), e.g. a fan (9), are located on the downstream side of the filter panel and nozzle means (20) spray liquid into the gaseous flow on the upstream side of the filter panel. Liquid drains from the filter panel into liquid collection means (28) which suitably is substantially sealed from atmosphere and which is maintained at a balanced gaseous pressure with a portion of the gaseous flow duct downstream of the filter panel and upstream of the flow inducing means, e.g. by external gas conduits (35) and/or internal gas conduits (36). A droplet eliminator (29) may be positioned between the filter panel (18) and the flow inducing means (8). A silencer (7) may follow the flow inducing means (8). <IMAGE>
Description
SPECIFICATION
Dust filter apparatus
This invention relates to dust filter apparatus.
In particular, although not exclusively, the invention relates to dust filter apparatus for use in underground mines where it is known to induce an air flow away from a dust generating source, for example, a rock cutting head or a conveyor discharge station and to pass the induced air flow through the dust filter apparatus to remove particles of dust from the air.
Examples of prior dust filter apparatus suitable for use in underground mines are disclosed in British Patent Specifications Nos.
1412299 and 1 544462. Although these prior known filter apparatus are very efficient for suppressing dust they suffer from the disadvantage that the fan for inducing air flow is mounted upstream of the dust filter panel and therefore the fan blades are required to operate in wet and dusty air flow conditions.
In some installations excessive wear of the fan blades occurred and the fan required to be serviced after an undesirably short operational period.
An object of the present invention is to provide dust filter apparatus in which the fan is required to operate in less dusty conditions and which, thereby tends to increase the operation period required between fan servicing.
According to the present invention dust filter apparatus comprises a chamber providing a gaseous flow duct, a filter panel arranged across the duct, gaseous flow inducing means for inducing gaseous flow along the duct and through the filter panel, the gaseous flow inducing means being mounted downstream of the filter panel, nozzle means for spraying liquid into the gaseous flow duct upstream of the filter panel, and liquid collection means arranged to collect liquid draining from the filter panel, the gaseous pressure in the liquid collection means being balanced with the gaseous pressure in a portion of the gaseous flow duct downstream of the filter panel and upstream of the gaseous flow inducing means.
Preferably, passage means provide a gaseous passage connecting the liquid collection means to said portion of the gaseous flowduct.
Preferably, the liquid collection means substantially is sealed from atmosphere.
Preferably, liquid removal means for removing liquid from the gaseous flow is mounted in said portion of the duct downstream of the filter panel and upstream of the gaseous flow inducing means.
Conveniently, the liquid removal means comprises a plurality of vertically extending plates defining non-linear gaseous flow paths within said portion of the gaseous flow duct.
Advantageously, the gaseous flow inducing means comprises a fan.
Preferably, the filter panel comprises a fibrous mat filter.
Advantageously, the fibrous mat filter has a fibre density such that the mat filter retains substantially no liquid by capillary action and permits flow of liquid throughout the thickness of the filter in the directions parallel to, and transverse to, the direction of gaseous flow and having a loft or thickness such that in use the liquid from the nozzle means for spraying liquid saturates the whole of the mat filter, the arrangement being such that, in use, a continuous body of flowing liquid is formed coincident with the mat filter across the gaseous flow duct and having a thickness substantially equal to the thickness of the mat filter.
Alternatively, the filter panel comprises a plurality of filter layers arranged side by side, each filter layer extending across the crosssectional area of the gaseous flow duct and at least alternate filter layers defining at least portions of passageways for liquid flowing down the filter panel between two adjacent filter layers.
Preferably, repetitive alternate filter layers comprise fine and coarse sheets fabricated of wire, respectively, the flow of liquid in the panel tending to be restrained by filter layers comprising the fine sheets such that in use a liquid curtain is formed across the cross-sectional area of the gaseous flow duct.
Advantageously, each filter layer is crimped to define the portions of the passageways.
Conveniently, the sheets comprise knitted wire.
Preferably, the wire is stainless steel.
Preferably, a pre-filter is located on the upstream side of the filter panel.
Preferably, the pre-filter and the filter panel are mounted in a frame.
Preferably, the frame engages in a slide arranged transversely to the gaseous flow duct.
Advantageously, a plurality of filter panels are arranged across the gaseous flow duct.
Preferably, a silencer is mounted downstream of the gaseous flow inducing means.
By way of example only, one embodiment of the present invention will be described with reference to the accompanying drawings which shows a side view of dust filter apparatus constructed in accordance with the present invention.
The dust filter apparatus shown in the accompanying drawing comprises an assembled chamber 2 which provides an air flow duct extending the length of the dust filter apparatus. The ends of the assembled chamber 2 have flanges 3 and 4 for attachment to feed ducting 5 and exhaust ducting 6 via a silencer 7, respectively. In some installations the ex haust ducting is dispensed with. Air is induced to flow through the apparatus in a direction indicated by arrow X by an axial flow fan 8, the drive motor 9 of which is located between upper and lower branches 10 and 11 of a bifurcated air flow duct section, and the impeller 12 of which is located within a portion of the air flow duct upstream from the bifurcated section.The bifurcated section constitutes a downstream portion of the assembled chamber 2 and is supported at its downstream end by a platform 14 carried on a floor skid 15 extending the length of dust filter apparatus.
The upstream portion of the assembled chamber 2 comprises a filter unit including a filter panel 18 which can be removed from the assembled chamber via a door arrangement 19 which when closed seals the wall of the chamber.
The filter panel 18 comprises a fibrous mat filter arranged across the duct and having a fibre density such that the mat filter retains substantially no liquid by capillary action and permits flow of liquid throughout the thickness of the filter in the directions parallel to, and transverse to, the direction of gaseous flow and having a loft or thickness such that in use the liquid from nozzle means 20 for spraying liquid eg water, and included in the filter unit upstream of the filter panel saturates the whole of the mat filter, the arrangement being such that, in use, a continuous body of flowing liquid is formed coincident with the mat filter across the gaseous flow duct and having a thickness substantially equal to the thickness of the mat filter.
In other embodiments of dust filter apparatus a plurality of filter panels are provided in the filter unit, each filter panel extending across the cross-sectional area of the air flow duct.
In other embodiments of the invention, the or each filter panel comprises a plurality of filter layers extending across the cross-sectional area of the duct, at least alternate filter layers defining at least portions of passageways for liquid flowing down the filter panel between two adjacent filter layers. Repetitive, alternative filter layers comprising fine and coarse sheets fabricated of wire, respectively, the flow of liquid in the panel tending to be restrained by the filter layers comprising the fine sheets such that in use a liquid curtain is formed across the cross-sectional area of the duct. Each filter layer is crimped to define the portions of the passageways and the sheets comprise knitted stainless steel wire.
The nozzle means 20 comprises a plurality of liquid sprays 21 arranged to spray liquid into the air flow upstream of the filter panel so that in use liquid is sprayed on to all the cross-sectional area of the filter panel.
Pressurised liquid is fed to the nozzle means via a hose 24 leading from a pump 25 driven by a drive motor 26, the pump being fed via a hose 27 from a tank 28 mounted below the filter unit and constituting liquid collection means for liquid draining from the filter panel 18 and from liquid removal means 29 comprising a plurality of vertically extending catchment plates defining non-linear air flow paths which cause the air to shed a substantial portion of the liquid carried from the filter panel. Liquid flows from the bottom of the air flow duct via a plurality of drain pipes 30 into the tank 28 which substantially is sealed from atmosphere by a lid 31. Liquid in the tank is maintained at a desired level by a ball float valve 33 controlling the feed from a pressurised feed pipe 34.
The tank 28 is maintained at a balanced air pressure with the portion of the air flow duct containing the liquid removal means 29, ie that portion of the air flow duct downstream of the filter panel 18 and upstream of the air flow inducing means 8, 12 by passage means which connect the tank to said portion of the duct and which comprise a plurality of pipes 35 mounted externally of the tank and chamber, and/or by a plurality of pipes 36 mounted internally of the tank and chamber.
It will be noted that the uppermost ends of the pipes 35 and 36 are arranged above the level of liquid draining from the air flow duct so that there is no possibility of liquid entering the air pressure balancing pipes.
The dust filter apparatus is provided with brackets 40 enabling the apparatus to be suspended from an overhead support. In addition, inspection covers 41 are provided in the wall of the chamber 2.
A part conical plate 44 is provided around the inlet side of the dust filter apparatus to prevent liquid from the nozzle means 20 passing upstream of the apparatus. Any liquid finding its way from the nozzle means 20 to the plate 44 is urged to flow up the plate into the body of the air flow which thereby tends to carry the liquid back towards the filter unit.
This is an important feature in installations where the dust filter apparatus is mounted on an incline.
In use, the dust filter apparatus is connected to the feed duct 5 and water supplied along pipe 34 until the level in the tank reaches the desired height detected by the ball valve 33. The pump 25 is started so that the sprays from the nozzle means 20 saturate the whole of the filter panel 18.
The fan 8 then is started to induce an air flow from the feed duct 5 into the filter unit where substantially all the dust is removed by the filter panel before the treated air leaving the filter panel is induced to flow through the liquid removal means 29 where a substantial quantity of excess moisture is removed from the air before it reaches the fan impeller 12.
After passing through the fan the treated air flow is passed through the silencer 7 before being exhausted back into atmosphere.
It will be appreciated that although the air pressure in the portion of the air flow duct downstream of the filter panel and upstream of the fan is appreciably below atmospheric there is no tendancy for liquid to be drawn from the tank 28 back into the air flow duct.
This is because the air pressure in the tank is balanced with the air pressure existing in said portion of the air flow duct. In addition there is no interference with the flow of liquid draining through the drain pipes 30 from the filter panel 18 and liquid removal means 29 into the tank.
The flow of liquid down the filter panel throughout its thickness carries dust particles removed from the air flow through the filter towards the base of the duct and then via the drain pipe 30 into the tank 28. The effect of the liquid flow down the filter panel is to maintain the filter free of solid particles enabling the filter to have a relative long operational life before any servicing is required.
After a relatively long operational period depending upon the dust loading of the air flow passing through the filter apparatus the solid dust particles collected in the tank 28 must be removed by an operator who is required to stop operation of the apparatus during the tank cleaning operation. Upon the tank being cleaned, operation of the dust filter apparatus can be quickly restarted.
Air flow leaving the filter panel is induced through the catchment plate arrangement provided by the liquid removal means 29 where a substantial portion of the liquid is removed from the air flow before it reaches the fan impeller 22. Thus, the fan impeller tends to operate in relatively dust free conditions and without excess of moisture. Consequently, the operational life of the fan impeller tends to be relatively long and the necessary servicing interval is correspondingly increased to an acceptable period.
From the above description it will be appreciated that the present invention provides dust filter apparatus which tends to overcome or reduce some of the problems encountered with the prior known apparatus.
In other embodiments of the invention other forms of gaseous flow inducing means are used, for example, a centrifugal fan.
CLAIMS (24 August 1979)
1. Dust filter apparatus comprising a chamber providing a gaseous flow duct, a filter panel arranged across the duct, gaseous flow inducing means for inducing gaseous flow along the duct and through the filter panel, the gaseous flow inducing means being mounted downstream of the filter panel, nozzle means for spraying liquid into the gaseous flow duct upstream of the filter panel, and liquid collection means arranged to collect liquid draining from the filter panel, the gaseous pressure in the liquid collection means being balanced with the gaseous pressure in a portion of the gaseous flow duct downstream of the filter panel and upstream of the gaseous flow inducing means.
2. Apparatus according to claim 1, comprising passage means to provide a gaseous passage connecting the liquid collection means to said portion of the gaseous flow duct.
3. Apparatus according to claim 1 or 2, in which the liquid collection means substantially is sealed from atmosphere.
4. Apparatus according to claim 1, 2, or 3, in which liquid removal means for removing liquid from the gaseous flow is mounted in said portion of the duct downstream of the filter panel and upstream of the gaseous flow inducing means.
5. Apparatus according to claim 4, in which the liquid removal means comprises a plurality of vertically extending plates defining non-linear gaseous flow paths within said portion of the gaseous flow duct.
6. Apparatus according to any one of the preceding claims, in which the gaseous inducing means comprises a fan.
7. Apparatus according to any one of the preceding claims, in which the filter panel comprises a fibrous mat filter.
8. Apparatus according to claim 7, in which the fibrous mat filter has a fibre density such that the mat filter retains substantially no liquid by capillary action and permits flow of liquid throughout the thickness of the filter in the direction parallel to, and transverse to, the direction of gaseous flow and having a loft or thickness such that in use the liquid from the nozzle means for spraying liquid saturates the whole of the mat filter, the arrangement being such that, in use, a continuous body of flowing liquid is formed coincident with the mat filter across the gaseous flow duct and having a thickness substantially equal to the thickness of the mat filter.
9. Apparatus according to any one of the preceding claims 1 to 6, in which the filter panel comprises a plurality of filter layers arranged side by side, each filter layer extending across the cross-sectional area of the gaseous flow duct and at least alternate filter layers defining at least portions of passageways for liquid flowing down the filter panel between two adjacent filter layers.
10. Apparatus according to claim 9, in which repetitive alternate filter layers comprise fine and coarse sheets fabricated of wire, respectively, the flow of liquid in the panel tending to be restrained by filter layers comprising the fine sheets such that in use a liquid curtain is formed across the cross-sectional area of the gaseous flow duct.
11. Apparatus according to claim 10, in which each filter layer is crimped to define the portions of the passageways.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (18)
1. Dust filter apparatus comprising a chamber providing a gaseous flow duct, a filter panel arranged across the duct, gaseous flow inducing means for inducing gaseous flow along the duct and through the filter panel, the gaseous flow inducing means being mounted downstream of the filter panel, nozzle means for spraying liquid into the gaseous flow duct upstream of the filter panel, and liquid collection means arranged to collect liquid draining from the filter panel, the gaseous pressure in the liquid collection means being balanced with the gaseous pressure in a portion of the gaseous flow duct downstream of the filter panel and upstream of the gaseous flow inducing means.
2. Apparatus according to claim 1, comprising passage means to provide a gaseous passage connecting the liquid collection means to said portion of the gaseous flow duct.
3. Apparatus according to claim 1 or 2, in which the liquid collection means substantially is sealed from atmosphere.
4. Apparatus according to claim 1, 2, or 3, in which liquid removal means for removing liquid from the gaseous flow is mounted in said portion of the duct downstream of the filter panel and upstream of the gaseous flow inducing means.
5. Apparatus according to claim 4, in which the liquid removal means comprises a plurality of vertically extending plates defining non-linear gaseous flow paths within said portion of the gaseous flow duct.
6. Apparatus according to any one of the preceding claims, in which the gaseous inducing means comprises a fan.
7. Apparatus according to any one of the preceding claims, in which the filter panel comprises a fibrous mat filter.
8. Apparatus according to claim 7, in which the fibrous mat filter has a fibre density such that the mat filter retains substantially no liquid by capillary action and permits flow of liquid throughout the thickness of the filter in the direction parallel to, and transverse to, the direction of gaseous flow and having a loft or thickness such that in use the liquid from the nozzle means for spraying liquid saturates the whole of the mat filter, the arrangement being such that, in use, a continuous body of flowing liquid is formed coincident with the mat filter across the gaseous flow duct and having a thickness substantially equal to the thickness of the mat filter.
9. Apparatus according to any one of the preceding claims 1 to 6, in which the filter panel comprises a plurality of filter layers arranged side by side, each filter layer extending across the cross-sectional area of the gaseous flow duct and at least alternate filter layers defining at least portions of passageways for liquid flowing down the filter panel between two adjacent filter layers.
10. Apparatus according to claim 9, in which repetitive alternate filter layers comprise fine and coarse sheets fabricated of wire, respectively, the flow of liquid in the panel tending to be restrained by filter layers comprising the fine sheets such that in use a liquid curtain is formed across the cross-sectional area of the gaseous flow duct.
11. Apparatus according to claim 10, in which each filter layer is crimped to define the portions of the passageways.
12. Apparatus according to claim 11, in
which the sheets comprise knitted wire.
13. Apparatus according to claim 12, in which the wire is stainless steel.
14. Apparatus according to-any one of the preceding claims, in which a pre-filter is located on the upstream side of the filter panel.
15. Apparatus according to claim 14, in which the pre-filter and the filter panel are mounted in a frame.
16. Apparatus according to claim 15, in which the frame engages in a slide arranged transversely to the gaseous flow duct.
17. Apparatus according to any one of the preceding claims, in which a plurality of filter panels are arranged across the gaseous flow duct.
18. Dust filter apparatus substantially as described herein and as shown in the accompanying drawing.
18. Apparatus according to any one of the preceding claims, in which a silencer is mounted downstream of the gaseous flow inducing means.
19. Dust filter apparatus substantially as described herein and as shown in the accompanying drawing.
CLAIMS (6 June 1980)
1. Dust filter apparatus comprising a chamber providing a gaseous flow duct, a filter panel arranged across the duct, gaseous flow inducing means for inducing gaseous flow along the duct and through the filter panel, the gaseous flow inducing means being mounted downstream of the filter panel, nozzle means for spraying liquid into the gaseous flow duct upstream of the filter panel, and liquid collection means arranged to collect liquid draining from the filter panel, the gaseous pressure in the liquid collection means being balanced with the gaseous pressure in a portion of the gaseous flow duct downstream of the filter panel and upstream of the gaseous flow inducing means, the liquid collection means comprising a plurality of vertically extending plates defining non-linear gaseous flow paths within said portion of the gaseous flow duct.
5. Apparatus according to any one of the preceding claims, in which the gaseous inducing means comprises a fan.
6. Apparatus according to any one of the preceding claims, in which the filter panel comprises a fibrous mat filter.
7. Apparatus according to claim 6, in which the fibrous mat filter has a fibre density such that the mat filter retains substantially no liquid by capillary action and permits flow of liquid throughout the thickness of the filter in the direction parallel to, and transverse to, the direction of gaseous flow and having a loft or thickness such that in use the liquid from the nozzle means for spraying liquid saturates the whole of the mat filter, the arrangement being such that, in use, a continuous body of flowing liquid is formed coincident with the mat filter across the gaseous flow duct and having a thickness substantially equal to the thickness of the mat filter.
8. Apparatus according to any one of the preceding claims 1 to 5, in which the filter panel comprises a plurality of filter layers arranged side by side, each filter layer extending across the cross-sectional area of the gaseous flow duct and at least alternate filter layers defining at least portions of passageways for liquid flowing down the filter panel between two adjacent filter layers.
9. Apparatus according to claim 8, in which repetitive alternate filter layers comprise fine and coarse sheets fabricated of wire, respectively, the flow of liquid in the panel tending to be restrained by filter layers comprising the fine sheets such that in use a liquid curtain is formed across the cross-sectional area of the gaseous flow duct.
10. Apparatus according to claim 9, in which each filter layer is crimped to define the portions of the passageways.
11. Apparatus according to claim 10, in which the sheets comprise knitted wire.
12. Apparatus according to claim 11, in which the wire is stainless steel.
13. Apparatus according to any one of the preceding claims, in which a pre-filter is located on the upstream side of the filter panel.
14. Apparatus according to claim 13, in which the pre-filter and the filter panel are mounted in a frame.
15. Apparatus according to claim 14, in which the frame engages in a slide arranged transversely to the gaseous flow duct.
16. Apparatus according to any one of the preceding claims, in which a plurality of filter panels are arranged across the gaseous flow duct.
17. Apparatus according to any one of the preceding claims, in which a silencer is mounted downstream of the gaseous flow inducing means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7929502A GB2057911B (en) | 1979-08-24 | 1979-08-24 | Dust filter apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7929502A GB2057911B (en) | 1979-08-24 | 1979-08-24 | Dust filter apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2057911A true GB2057911A (en) | 1981-04-08 |
| GB2057911B GB2057911B (en) | 1983-05-05 |
Family
ID=10507405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7929502A Expired GB2057911B (en) | 1979-08-24 | 1979-08-24 | Dust filter apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2057911B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2531874A1 (en) * | 1982-06-22 | 1984-02-24 | Voest Alpine Ag | DUST |
| US4484937A (en) * | 1981-05-29 | 1984-11-27 | Coal Industry (Patents) Limited | Dust filter apparatus |
| US5178654A (en) * | 1992-05-19 | 1993-01-12 | Spendrup And Associates, Inc. | Wet scrubber apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104289057A (en) * | 2013-07-16 | 2015-01-21 | 江苏金陶环保工程有限公司 | Novel waste gas filter |
| CN104727818B (en) * | 2015-03-23 | 2017-04-05 | 中国葛洲坝集团第五工程有限公司 | Driving mobile type dust collector |
-
1979
- 1979-08-24 GB GB7929502A patent/GB2057911B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4484937A (en) * | 1981-05-29 | 1984-11-27 | Coal Industry (Patents) Limited | Dust filter apparatus |
| FR2531874A1 (en) * | 1982-06-22 | 1984-02-24 | Voest Alpine Ag | DUST |
| US5178654A (en) * | 1992-05-19 | 1993-01-12 | Spendrup And Associates, Inc. | Wet scrubber apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2057911B (en) | 1983-05-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |