US3236249A - Cleaners for air filters - Google Patents

Cleaners for air filters Download PDF

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Publication number
US3236249A
US3236249A US394881A US39488164A US3236249A US 3236249 A US3236249 A US 3236249A US 394881 A US394881 A US 394881A US 39488164 A US39488164 A US 39488164A US 3236249 A US3236249 A US 3236249A
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United States
Prior art keywords
platform
frame
fitting
open
extending
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Expired - Lifetime
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US394881A
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Herbert L Everroad
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EVERROAD SUPPLY CO
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EVERROAD SUPPLY CO
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Priority to US394881A priority Critical patent/US3236249A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D41/00—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids
    • B01D41/04—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids of rigid self-supporting filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/04—Cartridge filters of the throw-away type with cartridges made of a piece of unitary material, e.g. filter paper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/08—Air cleaners with means for removing dust, particles or liquids from cleaners; with means for indicating clogging; with by-pass means; Regeneration of cleaners

Definitions

  • This invention relates to a cleaner for air filters and more particularly to a device for cleaning the relatively large air filters as used on heavy industrial engines.
  • Filters of this type comprise hollow cylinders having perforated walls containing a relatively thick annular packing of accordion-pleated, folded filter paper in which the foreign materials are entrapped from the air flowing to the engine.
  • the filters are formed in a variety of differing diameters, differing lengths, and differing wall thickness and, due to the relatively tightly-packed filter paper are exceedingly difficult to clean. As a result, cleaning is rarely attempted since, it is usually more economical and less time consuming to simply replace the clogged filters with new filters.
  • the principal object of this invention is to provide an economical, highly efficient and easily used filter cleaning device by means of which the dust, sand, dirt and other debris can be quickly and efficiently removed from used filters to restore the original free-air flow condition.
  • Another object is to provide a filter cleaning device for the above purpose which will not require driving motors or other power devices and which eliminates all hand labor.
  • a further object is to so construct the filter cleaner that filters of various sizes and various wall thicknesses can be cleaned without changes or adjustments in the cleaner and without damage to the filter elements.
  • FIG. 1 is a side-elevational view of the improved filter cleaner as it would appear in its outer container ready for use;
  • FIG. 2 is a vertical diametric section through the outer container showing the internal cleaning elements
  • FIG. 3 is a top view of the complete unit
  • FIG. 4 is an enlarged, fragmentary, detail section to be later described
  • FIG. 5 is a perspective illustration showing the type of filter the invention is more particularly designed to clean.
  • FIG. 6 is a fragmentary detail view of a supply connection incorporating a T-fitting 43 and two manual shutoff valves 44 and 45 which may be used to supply two different fluids either sequentially or admixed to the filter cleaner.
  • the cleaning elements are assembled as a complete unit adapted to be removably suspended in an outer container 10 provided with a drain plug 41 in its bottom.
  • the cleaning unit employs an outer frame having a circular top rod 11 from which, preferably three, vertical outer side rods 12 depend to support a horizontal open bottom member 13.
  • the upper extremities of the outer side rods are bent outwardly and downwardly to form hooks 14 which are hung from notches 15 formed in the upper edge of the outer container 10.
  • the inner rod frame is supported in radially-spaced relation within the outer frame.
  • the inner rod frame comprises three vertical suspension rods 16, each extending ice inwardly and downwardly, as shown at 17, from the circular top rod 11 of the outer frame, thence vertically downward to support an open horizontal platform 18.
  • the suspension rods are rigidly maintained in verticallyspaced relation by means of a brace ring 39 welded thereto and extending downwardly to the open horizontal platforom 18.
  • the platform 18 is circular and is formed with radially-extending spokes 19 which support a horizontal rod ring 20 of relatively small diameter about the axis of the platform 18.
  • a water supply pipe 21 is welded or otherwise secured to the outer frame and terminates at its upper extremity in an outwardly extending shutoff valve 22, to which a conventional hose may be attached, and at its lower extremity in a horizontal pipe 23.
  • the horizontal pipe 23 is welded or otherwise secured to the bottom member 13 and extends to an upturned elbow 24, at the axis of the frame upon which a swivel fitting 25 is mounted.
  • the swivel fitting is of any conventional type, As illustrated, a vertical, tubular stem 27 is rotatably mounted in the fitting 25 and carries a coupling 26 which is maintained in sealed engagement with the fitting 25 by means of a compression spring 28. Thus, the coupling 26 is free to rotate on the fitting 25 at the axis of the frames.
  • the coupling 26 furnishes water to a cross fitting 29 from the sides of which two radial pipes 30 oppositely project to support, at their outer extremities, vertical outer spray pipes 31 in the annular space between the outer side rods 12 and the suspension rods 16.
  • the spray pipes are closed at their tops by means of suitable caps 33.
  • a plurality of outside spray heads 32 are mounted on and faced inward at a slight radial tangent from each of the spray pipes 31.
  • a riser pipe 34- arises from the upper outlet of the cross fitting 29 upon which a plurality of T-fittings 35 are alternately joined by means of pipe nipples 36.
  • the T- fittings 35 and the nipples 36 form a center spray standard 37.
  • An inside spray head 38 is mounted in each of the T-fittings 35 to direct water sprays radially outward from the center spray standard 37. It is preferred to employ a quick detachable coupler 42 to connect the riser pipe 34 to the cross fitting 29.
  • the filter cleaner of this invention is designed to clean hollow, cylindrical, industrial air filters such as illustrated at all in FIG. 5.
  • the filter 4th is rested upon the horizontal platform 18 so as to surround the standard 37, as indicated in broken line in FIG. 2.
  • Water is admitted to the supply pipe 21 and discharges against the exterior of the filter 40 from the outside spray heads 32 and against the interior surface from the inside spray heads 38 on the standard 37. Since the outer spray heads are positioned at a slightly inclined radial angle, the outer sprays will react to rotate all of the sprays about the axis of the standard.
  • the inner frame has a diameter in excess of the largest expected filter and the spray pipes have a length in excess of the longest expected filter so that no adjustments are necessary to handle any standard size of filter.
  • a device for cleaning engine air filters comprising: an outer open frame consisting of vertical side rods joining and supporting an open bottom member; an inner open frame supported concentrically within and in spaced relation to said outer frame, said inner frame consisting of vertical suspension rods extending downwardly to an open horizontal platform for supporting a tubular engine air filter; a water supply conduit supported by said bottom member and extending concentrically upward therefrom; a rotatable swivel fitting mounted on said conduit below said platform; a cross fitting mounted on said swivel fitting; spray pipes extending oppositely outward from said cross fitting and upwardly between said outer frame and said inner frame at each side of said inner frame; a plurality of outer spray heads mounted on said spray pipes and positioned to direct water sprays radially inward against the external surface of an air filter resting on said platform; a riser standard mounted on said cross fitting and extending axially upward through said platform; and a plurality of inner spray heads mounted on said standard and positioned to direct water sprays radially outward against the inner surface of
  • a device for cleaning engine air filters as described in claim 1 in which said side rods terminate at their upper extremities in outwardly extending hooks adapted to engage the rim of an outer container to suspend said frames therein.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Description

1966 H. L. EVERROAD CLEANERS FOR AIR FILTERS Filed Sept. 8, 1964 III! INVENTOR Herberf L. Everroad Y ATTORNEY United States Patent 3,236,249 CLEANERS FOR AIR FILTERS Herbert L. Even-cad, Denver, (3010., assignor to Everroad Supply Company, Denver, Colo. Filed Sept. 8, 1964, Ser. No. 394,881 2 Claims. (Cl. 134-167) This invention relates to a cleaner for air filters and more particularly to a device for cleaning the relatively large air filters as used on heavy industrial engines. Filters of this type comprise hollow cylinders having perforated walls containing a relatively thick annular packing of accordion-pleated, folded filter paper in which the foreign materials are entrapped from the air flowing to the engine. The filters are formed in a variety of differing diameters, differing lengths, and differing wall thickness and, due to the relatively tightly-packed filter paper are exceedingly difficult to clean. As a result, cleaning is rarely attempted since, it is usually more economical and less time consuming to simply replace the clogged filters with new filters.
The principal object of this invention is to provide an economical, highly efficient and easily used filter cleaning device by means of which the dust, sand, dirt and other debris can be quickly and efficiently removed from used filters to restore the original free-air flow condition.
Another object is to provide a filter cleaning device for the above purpose which will not require driving motors or other power devices and which eliminates all hand labor.
A further object is to so construct the filter cleaner that filters of various sizes and various wall thicknesses can be cleaned without changes or adjustments in the cleaner and without damage to the filter elements.
Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy and efficiency. These will become more apparent from the following description.
In the following detailed description of the invention, reference is made to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.
In the drawing:
FIG. 1 is a side-elevational view of the improved filter cleaner as it would appear in its outer container ready for use;
FIG. 2 is a vertical diametric section through the outer container showing the internal cleaning elements;
FIG. 3 is a top view of the complete unit;
FIG. 4 is an enlarged, fragmentary, detail section to be later described;
FIG, 5 is a perspective illustration showing the type of filter the invention is more particularly designed to clean; and
FIG. 6 is a fragmentary detail view of a supply connection incorporating a T-fitting 43 and two manual shutoff valves 44 and 45 which may be used to supply two different fluids either sequentially or admixed to the filter cleaner.
The cleaning elements are assembled as a complete unit adapted to be removably suspended in an outer container 10 provided with a drain plug 41 in its bottom. The cleaning unit employs an outer frame having a circular top rod 11 from which, preferably three, vertical outer side rods 12 depend to support a horizontal open bottom member 13. The upper extremities of the outer side rods are bent outwardly and downwardly to form hooks 14 which are hung from notches 15 formed in the upper edge of the outer container 10.
An inner rod frame is supported in radially-spaced relation within the outer frame. The inner rod frame comprises three vertical suspension rods 16, each extending ice inwardly and downwardly, as shown at 17, from the circular top rod 11 of the outer frame, thence vertically downward to support an open horizontal platform 18. The suspension rods are rigidly maintained in verticallyspaced relation by means of a brace ring 39 welded thereto and extending downwardly to the open horizontal platforom 18. The platform 18 is circular and is formed with radially-extending spokes 19 which support a horizontal rod ring 20 of relatively small diameter about the axis of the platform 18.
A water supply pipe 21 is welded or otherwise secured to the outer frame and terminates at its upper extremity in an outwardly extending shutoff valve 22, to which a conventional hose may be attached, and at its lower extremity in a horizontal pipe 23. The horizontal pipe 23 is welded or otherwise secured to the bottom member 13 and extends to an upturned elbow 24, at the axis of the frame upon which a swivel fitting 25 is mounted. The swivel fitting is of any conventional type, As illustrated, a vertical, tubular stem 27 is rotatably mounted in the fitting 25 and carries a coupling 26 which is maintained in sealed engagement with the fitting 25 by means of a compression spring 28. Thus, the coupling 26 is free to rotate on the fitting 25 at the axis of the frames.
The coupling 26 furnishes water to a cross fitting 29 from the sides of which two radial pipes 30 oppositely project to support, at their outer extremities, vertical outer spray pipes 31 in the annular space between the outer side rods 12 and the suspension rods 16. The spray pipes are closed at their tops by means of suitable caps 33. A plurality of outside spray heads 32 are mounted on and faced inward at a slight radial tangent from each of the spray pipes 31.
A riser pipe 34- arises from the upper outlet of the cross fitting 29 upon which a plurality of T-fittings 35 are alternately joined by means of pipe nipples 36. The T- fittings 35 and the nipples 36 form a center spray standard 37. An inside spray head 38 is mounted in each of the T-fittings 35 to direct water sprays radially outward from the center spray standard 37. It is preferred to employ a quick detachable coupler 42 to connect the riser pipe 34 to the cross fitting 29.
The filter cleaner of this invention is designed to clean hollow, cylindrical, industrial air filters such as illustrated at all in FIG. 5. The filter 4th is rested upon the horizontal platform 18 so as to surround the standard 37, as indicated in broken line in FIG. 2. Water is admitted to the supply pipe 21 and discharges against the exterior of the filter 40 from the outside spray heads 32 and against the interior surface from the inside spray heads 38 on the standard 37. Since the outer spray heads are positioned at a slightly inclined radial angle, the outer sprays will react to rotate all of the sprays about the axis of the standard.
The inner frame has a diameter in excess of the largest expected filter and the spray pipes have a length in excess of the longest expected filter so that no adjustments are necessary to handle any standard size of filter.
While a specific form of the improvement has been described and illustrated herein, it is to be understood that the same may be varied, Within the scope of the appended claims, without departing from the spirit of the invention.
Having thus described the invention, what is claimed and desired secured by Letters Patent is:
1. A device for cleaning engine air filters comprising: an outer open frame consisting of vertical side rods joining and supporting an open bottom member; an inner open frame supported concentrically within and in spaced relation to said outer frame, said inner frame consisting of vertical suspension rods extending downwardly to an open horizontal platform for supporting a tubular engine air filter; a water supply conduit supported by said bottom member and extending concentrically upward therefrom; a rotatable swivel fitting mounted on said conduit below said platform; a cross fitting mounted on said swivel fitting; spray pipes extending oppositely outward from said cross fitting and upwardly between said outer frame and said inner frame at each side of said inner frame; a plurality of outer spray heads mounted on said spray pipes and positioned to direct water sprays radially inward against the external surface of an air filter resting on said platform; a riser standard mounted on said cross fitting and extending axially upward through said platform; and a plurality of inner spray heads mounted on said standard and positioned to direct water sprays radially outward against the inner surface of the air filter resting on said platform.
2. A device for cleaning engine air filters as described in claim 1 in which said side rods terminate at their upper extremities in outwardly extending hooks adapted to engage the rim of an outer container to suspend said frames therein.
No references cited.
CHARLES A. WILLMUTH, Primary Examiner.

Claims (1)

1. A DEVICE FOR CLEANING ENGINE AIR FILTERS COMPRISING: AN OUTER OPEN FRAME CONSISTING OF VERTICAL SIDE RODS JOINING AND SUPPORTING AN OPEN BOTTOM MEMBER; AN INNER OPEN FRAME SUPPORTED CONCENTRICALLY WITHIN AND IN SPACED RELATION TO SAID OUTER FRAME, SAID INNER FRAME CONSISTING OF VERTICAL SUSPENSION RODS EXTENDING DOWNWARDLY TO AN OPEN HORIZONTAL PLATFORM FOR SUPPORTING A TUBULAR ENGINE AIR FILTER; A WATER SUPPLY CONDUIT SUPPORTED BY SAID BOTTOM MEMBER AND EXTENDING CONCENTRICALLY UPWARD THEREFROM; A ROTATABLE SWIVEL FITTING MOUNTED ON SAID CONDUIT BELOW SAID PLATFORM; A CROSS FITTING MOUNTED ON SAID SWIVEL FITTING; SPRAY PIPES EXTENDING OPPOSITELY OUTWARD FROM SAID CROSS FITTING AND UPWARDLY BETWEEN SAID OUTER FRAME AND SAID INNER FRAME AT EACH SIDE OF AID INNER FRAME; A PLURALITY OF OUTER SPRAY HEADS MOUNTED ON SAID SPRAY PIPES AND POSITIONED TO DIRECT WATER SPRAYS RADIALLY INWARD AGAINST THE EXTERNAL SURFACE OF AN AIR FILTER RESTING ON SAID PLATFORM; A RISER STANDARD MOUNTED ON SAID CROSS FITTING AND EXTENDING AXIALLY UPWARD THROUGH SAID PLATFORM; AND A PLURALITY OF INNER SPRAY HEADS MOUNTED ON SAID STANDARD AND POSITIONED TO DIRECT WATER SPRAYS RADIALLY OUTWARD AGAINST THE INNER SURFACE OF THE AIR FILTER RESTING ON SAID PLATFORM.
US394881A 1964-09-08 1964-09-08 Cleaners for air filters Expired - Lifetime US3236249A (en)

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688780A (en) * 1969-07-07 1972-09-05 Herbert L Everroad Air filter cleaning method
US4185359A (en) * 1977-06-03 1980-01-29 Harris Hatchery Poultry cleaning method
US4241744A (en) * 1979-07-02 1980-12-30 Jordan Nathaniel Sr Cleaning system for tanks
US4259945A (en) * 1979-10-11 1981-04-07 Lawson Richard L Exhaust system washing apparatus
US4299245A (en) * 1980-04-21 1981-11-10 Clapper Millard F Filter cleaning system
US4352361A (en) * 1980-09-02 1982-10-05 Richard Chesler Dental appliance cleaning device
US4420006A (en) * 1976-12-23 1983-12-13 The Frymaster Corporation Spray cleaning system for frying apparatus
DE3703452A1 (en) * 1987-02-05 1988-08-18 Dietrich Barnstedt Scouring powdered material applied to filter - by rotating air blasts, to modify subsequent filtration properties
US4807654A (en) * 1987-08-13 1989-02-28 Jui Chi Ho Dishwasher
WO1991019574A1 (en) * 1990-06-11 1991-12-26 Titmas And Associates Incorporated Method and apparatus for cleaning the annulus formed by concentric pipes
US5301880A (en) * 1992-06-17 1994-04-12 Benian Filter Company, Inc. Filter cleaning nozzle apparatus
US5384045A (en) * 1994-05-16 1995-01-24 Chmielewski; Jerry Filter cleaner
DE4431767A1 (en) * 1993-09-06 1995-03-09 Lim Kyung Suk Filter containing chaff or chopped straw
US5667683A (en) * 1992-06-17 1997-09-16 Benian Filter Company, Inc. Backwashable liquid filter system using rotating spray
US6109277A (en) * 1996-09-10 2000-08-29 Landa, Inc. Parts washer
US20090101184A1 (en) * 2007-10-18 2009-04-23 Lance Frederick Wendel Spa filter cleaning device
US20100051071A1 (en) * 2008-09-04 2010-03-04 Jackson Msc Llc Spray arm
FR2936430A1 (en) * 2008-09-29 2010-04-02 Michel Vavasseur Filtration screen or peripheral filter cleaning device for e.g. food industry, has nozzle tip for ensuring internal washing of filter in cage, and dismounting tool integrated to cage for dismounting device
FR2944454A1 (en) * 2009-04-20 2010-10-22 Dsn Design Service Network Device for cleaning filter cartridge utilized for filtering water circulating in swimming pool, has nozzles connected to inlet and mounted inside enclosure so as to direct washing fluid projection jet to induce torque for rotating cartridge
US20100282660A1 (en) * 2009-05-07 2010-11-11 Hughes C Michael Cartridge filter securing apparatus
WO2011075658A1 (en) * 2009-12-17 2011-06-23 Jackson Msc Llc Warewashing system arm
ITCS20130012A1 (en) * 2013-05-21 2014-11-22 Giuseppe Neri WASHING SYSTEM CONSISTING OF ROTATING ELEMENTS
US20160032603A1 (en) * 2014-08-03 2016-02-04 Ulrich Hegi Filter apparatus with filter cleaning arrangement
US10967307B1 (en) 2020-07-06 2021-04-06 Sw Filter Solutions Llc Automated, self-cleaning filter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688780A (en) * 1969-07-07 1972-09-05 Herbert L Everroad Air filter cleaning method
US4420006A (en) * 1976-12-23 1983-12-13 The Frymaster Corporation Spray cleaning system for frying apparatus
US4185359A (en) * 1977-06-03 1980-01-29 Harris Hatchery Poultry cleaning method
US4241744A (en) * 1979-07-02 1980-12-30 Jordan Nathaniel Sr Cleaning system for tanks
US4259945A (en) * 1979-10-11 1981-04-07 Lawson Richard L Exhaust system washing apparatus
US4299245A (en) * 1980-04-21 1981-11-10 Clapper Millard F Filter cleaning system
US4352361A (en) * 1980-09-02 1982-10-05 Richard Chesler Dental appliance cleaning device
DE3703452A1 (en) * 1987-02-05 1988-08-18 Dietrich Barnstedt Scouring powdered material applied to filter - by rotating air blasts, to modify subsequent filtration properties
US4807654A (en) * 1987-08-13 1989-02-28 Jui Chi Ho Dishwasher
WO1991019574A1 (en) * 1990-06-11 1991-12-26 Titmas And Associates Incorporated Method and apparatus for cleaning the annulus formed by concentric pipes
US5080720A (en) * 1990-06-11 1992-01-14 Titmas And Associates Incorporated Method and apparatus for cleaning the annulus formed by concentric pipes
US5301880A (en) * 1992-06-17 1994-04-12 Benian Filter Company, Inc. Filter cleaning nozzle apparatus
US5667683A (en) * 1992-06-17 1997-09-16 Benian Filter Company, Inc. Backwashable liquid filter system using rotating spray
DE4431767A1 (en) * 1993-09-06 1995-03-09 Lim Kyung Suk Filter containing chaff or chopped straw
US5384045A (en) * 1994-05-16 1995-01-24 Chmielewski; Jerry Filter cleaner
US6109277A (en) * 1996-09-10 2000-08-29 Landa, Inc. Parts washer
US20090101184A1 (en) * 2007-10-18 2009-04-23 Lance Frederick Wendel Spa filter cleaning device
US8333207B2 (en) 2008-09-04 2012-12-18 Jackson Msc Llc Spray arm for directing spray in a warewashing machine
US20100051071A1 (en) * 2008-09-04 2010-03-04 Jackson Msc Llc Spray arm
FR2936430A1 (en) * 2008-09-29 2010-04-02 Michel Vavasseur Filtration screen or peripheral filter cleaning device for e.g. food industry, has nozzle tip for ensuring internal washing of filter in cage, and dismounting tool integrated to cage for dismounting device
FR2944454A1 (en) * 2009-04-20 2010-10-22 Dsn Design Service Network Device for cleaning filter cartridge utilized for filtering water circulating in swimming pool, has nozzles connected to inlet and mounted inside enclosure so as to direct washing fluid projection jet to induce torque for rotating cartridge
US20100282660A1 (en) * 2009-05-07 2010-11-11 Hughes C Michael Cartridge filter securing apparatus
US8517036B2 (en) 2009-12-17 2013-08-27 Jackson Wws, Inc. Warewashing system arm
CN102821877A (en) * 2009-12-17 2012-12-12 杰克逊Msc有限责任公司 Warewashing system arm
US20110146735A1 (en) * 2009-12-17 2011-06-23 Jackson Msc Llc Warewashing system arm
WO2011075658A1 (en) * 2009-12-17 2011-06-23 Jackson Msc Llc Warewashing system arm
CN102821877B (en) * 2009-12-17 2014-12-17 杰克逊Msc有限责任公司 Warewashing system arm
US9867520B2 (en) 2009-12-17 2018-01-16 Jackson Wws, Inc. Warewashing system arm
ITCS20130012A1 (en) * 2013-05-21 2014-11-22 Giuseppe Neri WASHING SYSTEM CONSISTING OF ROTATING ELEMENTS
WO2014187836A1 (en) * 2013-05-21 2014-11-27 Giuseppe Neri Washing system
US20160032603A1 (en) * 2014-08-03 2016-02-04 Ulrich Hegi Filter apparatus with filter cleaning arrangement
US9422738B2 (en) * 2014-08-03 2016-08-23 Ulrich Hegi Filter apparatus with filter cleaning arrangement
US10967307B1 (en) 2020-07-06 2021-04-06 Sw Filter Solutions Llc Automated, self-cleaning filter

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