US3685523A - Tobacco smoke filter - Google Patents

Tobacco smoke filter Download PDF

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Publication number
US3685523A
US3685523A US43775A US3685523DA US3685523A US 3685523 A US3685523 A US 3685523A US 43775 A US43775 A US 43775A US 3685523D A US3685523D A US 3685523DA US 3685523 A US3685523 A US 3685523A
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Prior art keywords
filter
smoke
wrapper
filter element
channel
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Expired - Lifetime
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US43775A
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Francis A M Labbe
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Molins Machine Co Ltd
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Molins Machine Co Ltd
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    • AHUMAN NECESSITIES
    • A24TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24DCIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/04Tobacco smoke filters characterised by their shape or structure
    • A24D3/045Tobacco smoke filters characterised by their shape or structure with smoke acceleration means, e.g. impact-filters

Definitions

  • a cigarette filter is provided with axially extending channels divided by axially extending walls of filtering material through which smoke is induced to pass from one channel to another, different channels being blocked at different ends so that smoke enters the filter by one channel and leaves by another.
  • 9 Drawing Figures Patented Aug. 22, 1972 2 Sheets-Sheet z IIIIIIIi7iIll/IA IIIIIIIIIIIIIIIIIIIII Inventor I FRANHS AUGUSTE MAURICE LABBE y C-v RnlBneLh', Shawl-4' II a? Atlorne is
  • the present invention relates to cigarette filters and more particularly to those which have a non-axial smoke path through them.
  • a cigarette filter comprising a shaped filter element enclosed in a tubular wrapper, and having at least two passages extending substantially axially of the filter, at least one of said passages being formed between the filter element and the inner surface of the wrapper, different passages being blocked at different ends to allow smoke to enter the filter by one passage and leave by another passage, and being divided from each other by part of said filter element through which smoke is constrained to pass.
  • FIG. 1 is a sectional view of one embodiment of the invention
  • FIG. 2 is a first end view of the filter shown in Figure
  • FIG. 3 is a second end view of the filter shown in Figure l;
  • FIGS. 4 to 6 are views similar to FIGS. 1 to 3 respectively;
  • FIG. 7 is a sectional view of a third embodiment of the invention.
  • FIG. 8 is a cross sectional view of a fourth embodiment of the invention.
  • FIG. 9 is a fragmentary sectional view in elevation of the embodiment shown in FIG. 8.
  • a cigarette filter comprises a cylindrical filter element 26 which has an axial channel 27 through it and which is wrapped in a thin porous paper web 28.
  • the element 26 may be formed from paper sheet or tow already pre-loaded with finely divided filter material, i.e., the paper or tow can be freely handled without any significant loss of filtering material from it.
  • the paper sheet or tow may be formed around a stationary or spinning spindle so as to form the axial channel 27.
  • the filter element is sealed at each end. At one end the central axial passage 27 is sealed whereas at the other end the central axial passage 27 is left open and a seal is formed around the outer periphery of the element 26 to project radially outwardly from the periphery in order tosclose the annular gap formed between the element 26 and an outer wrapper 34. This may be done by locating the filter plug in the flute of a rotating fluted drum, the plug being held in the flute by suction. The sealing may be effected by caps 29 and 30 of appropriate shape being stuck to the* ends of the plugs, as shown in FIGS. 1 to 3, or by the deposition of the filling, such as hot melt adhesive, over the appropriate areas of the ends of the plugyto form seals 31 and 32 as shown in FIGS. 4 to 6.
  • the plug with its ends carrying the seals referred to, is then combined end-on with a porous plug such as that shown at 38 in FIG. 7, and held together by a strip of relatively stiff paper 34 wrapped and stuck around them.
  • the filter element 26 is relatively thick, i.e., its thickness is equal to at least half the radius of the whole filter plug.
  • Smoke from a cigarette is drawn through the above mentioned porous plug (not shown), such as 38 in FIG. 7, to cause smoke to enter the axial channel 27 to the right of FIGS. 1 or 4 and then pass in a generally radially outward direction through the filter element 26 and porous wrapper 28 into the annular channel between the element 26 and the outer wrapper 34.
  • the seals 29, 30 and 31, 32 prevent the smoke from passing through the ends of the cylindrical filter element 26.
  • the filter element 35 is again cylindrical butcomp'rises an ,homogenous substance which has equal resistance to the. passage of smoke in both an axial and a radial direction. Because the material is homogeneous it is possible to use an al-' ternative sealing arrangement to the seals 29, 30 and 31, 32 of the embodiments of FIGS. 1 to 3 and 4 to 6 respectively.
  • the filter element'35 is combined with a porous plug 38 and the two are held together by a substantially nonporous outer wrapper 39.
  • the cylinder 35 may be extruded from a suitable filter material or it may comprise fiber which is highly loaded with finely divided filter material so that the loss coefficient' is completely controlled by the finely divided filter material. These filter lengths are then fed into the flutes of a rotatable drum and held there by suction. As the drum rotates a non-porous plug 36 is inserted into the central bore of one end of each cylinder and an annular non-porous plug 37 is located around the other end of the cylinder.
  • the cylinder is then taken from the fluted drum and brought end on with a filter stub 38, the two then being wrapped in a tube 39 of relative thick paper so as to form an annular air gap 40 round the cylinder, the two being spaced from the outer periphery of the cylinder by the annular plug 37.
  • the filter element' is again made of a homogeneous substance but instead of having a simple cylindrical form in which smoke enters through the central bore, passes through the walls of the cylinder and exits through the surrounding annulus, or vice versa, the filter material is extruded in a generally wheel-like cross section, i.e., a cross section consisting of a hub or core having plurality of radially outwardly end whereas the channels 48, 50, and 52 would be open at the mouthpiece end of the filter plug but closed at the tobacco end.
  • smoke would enter the channels 47, 49, and 51, pass through the filter arms 41 and 42, 43 and 44, and 45 and 46 respectively and leaves the filter plug through the channels 48, 50, and 52.
  • the smoke flow through the filter arms is substantially by the shortest path, as indicated by the arrows, and thus avoids the center zone of the extruded filter element.
  • This zone is thus ineffective as a filter and can with benefit be replaced by a core 53 which has a relatively high resistance to axial compression, as compared with the extruded filter material.
  • Thecentral core 53 could be made of a relatively cheap material thus saving the cost of the relatively expensive filter material which it replaces.
  • this is effected by localized deformation by heat sealing of a polythene skin 54 which encloses the cruciform filter material. This is done prior to the cut-off of the continuous filter rod at the lines AA and 8-H (FIG. 9).
  • the tobacco end of the filter is adjacent the line A-A and the mouthpiece and adjacent the line B-B.
  • a cigarette filter comprising a tubular wrapper, a filter element disposed within said wrapper, said filter element being comprised of an axial core member from which a plurality of radially directed arms extend so as to contact the wrapper, and which define a plurality of smoke passage ways, alternate passageways being blocked by smoke impervious means at opposite ends, the arms being constituted of a filter material so that smoke entering one passageway is constrained to pass through an adjacent passageway before exiting after coursing through a filter arm, the said core element being ineffective as a filter and having resistance to compression higher than the filter.
  • thermoplastic skin located within the wrapper, the thermoplastic skin being deformed at localized spots toform seals by which the ends of the passages are closed.

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  • Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Abstract

A cigarette filter is provided with axially extending channels divided by axially extending walls of filtering material through which smoke is induced to pass from one channel to another, different channels being blocked at different ends so that smoke enters the filter by one channel and leaves by another. In the preferred embodiment, the filter comprises a core having a resistance to compression from which arms of filtering material extend to the covering wrapper. These arm define smoke passageways alternate ones of which are blocked at opposite ends so that the smoke is constrained to pass from one channel or passageway through a filtering arm to at least one of the adjacent channels.

Description

United States Patent Labbe [4 Aug. 22, 1972 [54] TOBACCO SMOKE FILTER 3,502,087 3/1970 Romano ..131/10.5x
mum-s 3,394,713 7/1968 Thomsonetal......13l/l0.5X [72] Invent Seine ag Labbe 3,533,416 10/1970 Berger et al. ..131/105 x [73] Assignee: Molins Machine Company Limited,
London, England [22] Filed: June 5, 1970 [21] Appl. No.: 43,775
[30] Foreign Application Priority Data June 27, 1969 Great Britain ..32635/69 [52] US. Cl. ..131/261 B, 131/10.5, 131/210 [51] Int. Cl. ..A24d 01/04, A24f 07/04 [58] Field of Search ..l31/l0.3,10.5,10.7, 10.9, 131/210, 211
[56] References Cited UNITED STATES PATENTS 3,081,776 3/1963 Park ..131/10R 3,366,123 l/1968 Brothers ..131/10R 3,370,594 2/1968 Haslam ..13l/10.5 X 3,621,851 11/1971 Haskett etal ..l31/l0.5 1,619,387 3/1927 Waugh ..131/261 B FOREIGN PATENTS OR APPLICATIONS 1,118,860 3/1956 France ..l31/10.5
Primary Examiner-Melvin D. Rein Attorney-Craig, Antonelli, and Hill [57] ABSTRACT I A cigarette filter is provided with axially extending channels divided by axially extending walls of filtering material through which smoke is induced to pass from one channel to another, different channels being blocked at different ends so that smoke enters the filter by one channel and leaves by another. In the 2 Claims, 9 Drawing Figures Patented Aug. 22, 1972 2 Sheets-Sheet z IIIIIIIi7iIll/IA IIIIIIIIIIIIIIIIIIIII Inventor I FRANHS AUGUSTE MAURICE LABBE y C-v RnlBneLh', Shawl-4' II a? Atlorne is The present invention relates to cigarette filters and more particularly to those which have a non-axial smoke path through them.
According to the present invention there is provided a cigarette filter comprising a shaped filter element enclosed in a tubular wrapper, and having at least two passages extending substantially axially of the filter, at least one of said passages being formed between the filter element and the inner surface of the wrapper, different passages being blocked at different ends to allow smoke to enter the filter by one passage and leave by another passage, and being divided from each other by part of said filter element through which smoke is constrained to pass.
How the invention may be carried out will now be described, by way of example only, with reference to the accompanying drawings in which:
FIG. 1 is a sectional view of one embodiment of the invention;
FIG. 2 is a first end view of the filter shown in Figure FIG. 3 is a second end view of the filter shown in Figure l;
FIGS. 4 to 6 are views similar to FIGS. 1 to 3 respectively;
FIG. 7 is a sectional view of a third embodiment of the invention;
FIG. 8 is a cross sectional view of a fourth embodiment of the invention; and
FIG. 9 is a fragmentary sectional view in elevation of the embodiment shown in FIG. 8.
FIGS. 1 to 6 A cigarette filter comprises a cylindrical filter element 26 which has an axial channel 27 through it and which is wrapped in a thin porous paper web 28. The element 26 may be formed from paper sheet or tow already pre-loaded with finely divided filter material, i.e., the paper or tow can be freely handled without any significant loss of filtering material from it. The paper sheet or tow may be formed around a stationary or spinning spindle so as to form the axial channel 27.
The filter element is sealed at each end. At one end the central axial passage 27 is sealed whereas at the other end the central axial passage 27 is left open and a seal is formed around the outer periphery of the element 26 to project radially outwardly from the periphery in order tosclose the annular gap formed between the element 26 and an outer wrapper 34. This may be done by locating the filter plug in the flute of a rotating fluted drum, the plug being held in the flute by suction. The sealing may be effected by caps 29 and 30 of appropriate shape being stuck to the* ends of the plugs, as shown in FIGS. 1 to 3, or by the deposition of the filling, such as hot melt adhesive, over the appropriate areas of the ends of the plugyto form seals 31 and 32 as shown in FIGS. 4 to 6.
The plug, with its ends carrying the seals referred to, is then combined end-on with a porous plug such as that shown at 38 in FIG. 7, and held together by a strip of relatively stiff paper 34 wrapped and stuck around them. T-
The filter element 26 is relatively thick, i.e., its thickness is equal to at least half the radius of the whole filter plug. Smoke from a cigarette is drawn through the above mentioned porous plug (not shown), such as 38 in FIG. 7, to cause smoke to enter the axial channel 27 to the right of FIGS. 1 or 4 and then pass in a generally radially outward direction through the filter element 26 and porous wrapper 28 into the annular channel between the element 26 and the outer wrapper 34. The seals 29, 30 and 31, 32 prevent the smoke from passing through the ends of the cylindrical filter element 26.
FIG. 7
In the embodiment shown in FIG. 7 the filter element 35 is again cylindrical butcomp'rises an ,homogenous substance which has equal resistance to the. passage of smoke in both an axial and a radial direction. Because the material is homogeneous it is possible to use an al-' ternative sealing arrangement to the seals 29, 30 and 31, 32 of the embodiments of FIGS. 1 to 3 and 4 to 6 respectively.
With such a material its ends do not require to be sealed because any excess pressure between one side of the material and the other will result in a smoke flow through the thickness of the material, provided that the central bore and the outer annulus are closed over a length which is at least equal to the thickness of the cylinder so that the shortest path length is through the wall of the cylinder and not through its ends. Therefore, plugs 36, 37 are provided whose lengths are' greater than the thickness of the cylinder 35. Thus, as the filter material is in the form of a cylinder excess pressure applied between the inner bore and the outside of the cylinder willcause smoke to pass through the thickness of the cylinder and not through the ends of the cylinder."
As in the previously described embodiments the filter element'35 is combined with a porous plug 38 and the two are held together by a substantially nonporous outer wrapper 39.
The way in which this filter plug may be manufactured will now be briefly described. The cylinder 35 may be extruded from a suitable filter material or it may comprise fiber which is highly loaded with finely divided filter material so that the loss coefficient' is completely controlled by the finely divided filter material. These filter lengths are then fed into the flutes of a rotatable drum and held there by suction. As the drum rotates a non-porous plug 36 is inserted into the central bore of one end of each cylinder and an annular non-porous plug 37 is located around the other end of the cylinder. The cylinder is then taken from the fluted drum and brought end on with a filter stub 38, the two then being wrapped in a tube 39 of relative thick paper so as to form an annular air gap 40 round the cylinder, the two being spaced from the outer periphery of the cylinder by the annular plug 37.
Pros. 8-9
In this embodiment the filter element'is again made of a homogeneous substance but instead of having a simple cylindrical form in which smoke enters through the central bore, passes through the walls of the cylinder and exits through the surrounding annulus, or vice versa, the filter material is extruded in a generally wheel-like cross section, i.e., a cross section consisting of a hub or core having plurality of radially outwardly end whereas the channels 48, 50, and 52 would be open at the mouthpiece end of the filter plug but closed at the tobacco end. Thus smoke would enter the channels 47, 49, and 51, pass through the filter arms 41 and 42, 43 and 44, and 45 and 46 respectively and leaves the filter plug through the channels 48, 50, and 52.
With such a construction the smoke flow through the filter arms is substantially by the shortest path, as indicated by the arrows, and thus avoids the center zone of the extruded filter element. This zone is thus ineffective as a filter and can with benefit be replaced by a core 53 which has a relatively high resistance to axial compression, as compared with the extruded filter material. it is useful because in the production of such a filter the plugs can be subjected to relatively high compressive forces in an axial direction and if constructed entirely of the extruded filter material would be liable to collapse axially. Thecentral core 53 could be made of a relatively cheap material thus saving the cost of the relatively expensive filter material which it replaces.
Various methods may be employed to effect the end sealing of the channels 47 to 52 and in particular a 60 triangular section stub could be used in each channel.
. However, in the illustrated embodiment (FIG. 9) this is effected by localized deformation by heat sealing of a polythene skin 54 which encloses the cruciform filter material. This is done prior to the cut-off of the continuous filter rod at the lines AA and 8-H (FIG. 9). For a filter plug length contained between the lines A A and 8-8 the tobacco end of the filter is adjacent the line A-A and the mouthpiece and adjacent the line B-B.
What I claim as my invention and desire to secure by Letters Patent is:
l. A cigarette filter comprising a tubular wrapper, a filter element disposed within said wrapper, said filter element being comprised of an axial core member from which a plurality of radially directed arms extend so as to contact the wrapper, and which define a plurality of smoke passage ways, alternate passageways being blocked by smoke impervious means at opposite ends, the arms being constituted of a filter material so that smoke entering one passageway is constrained to pass through an adjacent passageway before exiting after coursing through a filter arm, the said core element being ineffective as a filter and having resistance to compression higher than the filter.
2. A filter element according to claim 1, in which the filter element is enclosed in a. thermoplastic skin located within the wrapper, the thermoplastic skin being deformed at localized spots toform seals by which the ends of the passages are closed.

Claims (2)

1. A cigarette filter comprising a tubular wrapper, a filter element disposed within said wrapper, said filter element being comprised of an axial core member from which a plurality of radially directed arms extend so as to contact the wrapper, and which define a plurality of smoke passage ways, alternate passageways being blocked by smoke impervious means at opposite ends, the arms being constituted of a filter material so that smoke entering one passageway is constrained to pass through an adjacent passageway before exiting after coursing through a filter arm, the said core element being ineffective as a filter and having resistance to compression higher than the filter.
2. A filter element according to claim 1, in which the filter element is enclosed in a thermoplastic skin located within the wrapper, the thermoplastic skin being deformed at localized spots to form seals by which the ends of the passages are closed.
US43775A 1969-06-27 1970-06-05 Tobacco smoke filter Expired - Lifetime US3685523A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752165A (en) * 1971-12-20 1973-08-14 G Harllee Smoke filter plug and process and cigarette made therefrom
US3841338A (en) * 1970-07-23 1974-10-15 British American Tobacco Co Tobacco-smoke filters
US3854384A (en) * 1971-05-24 1974-12-17 Brown & Williamson Tobacco Method of making tobacco smoke filters
US3865121A (en) * 1971-11-03 1975-02-11 Molins Ltd Cigarette filters
US3888160A (en) * 1971-02-01 1975-06-10 Imp Tobacco Group Ltd Tobacco smoke filter
US4026306A (en) * 1975-11-06 1977-05-31 American Filtrona Corporation Tobacco smoke filter
US4291712A (en) * 1977-11-11 1981-09-29 Sigarettenfabriek Ed. Laurens B.V. Cigarette filter and filter cigarette
US4388934A (en) * 1980-06-18 1983-06-21 British-American Tobacco Company Limited Filters
US4413641A (en) * 1979-09-07 1983-11-08 Philip Morris Incorporated Cigarette mouthpiece
US4492238A (en) * 1981-09-30 1985-01-08 Philip Morris Incorporated Method and apparatus for production of smoke filter components
EP0364253A1 (en) * 1988-10-12 1990-04-18 Rothmans International Services Limited Cigarette filter rod elements and cigarettes incorporating such filter rod elements
US4942887A (en) * 1987-06-15 1990-07-24 Fabriques De Tabac Reunies, S.A. Filter mouthpiece for a smoking article
EP0453299A1 (en) * 1990-04-20 1991-10-23 Rothmans, Benson & Hedges Inc. Cigarette smoke filter
US5495859A (en) * 1993-04-14 1996-03-05 1149235 Ontario Inc. Cigarette smoke filter system
US7735494B2 (en) 2006-03-03 2010-06-15 Xerosmoke, Llc Tabacco smoking apparatus
US20190216131A1 (en) * 2015-07-14 2019-07-18 Dynavap, LLC Diffuser disc and diffuser assembly

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1619387A (en) * 1925-10-05 1927-03-01 Lester R Waugh Smoking utensil
FR1118860A (en) * 1955-01-05 1956-06-12 R Schneider Ets Device for filtering tobacco smoke
US3081776A (en) * 1960-06-10 1963-03-19 Park Neil Hamill Cigarette coal anchor for filter cigarette
US3366123A (en) * 1965-10-23 1968-01-30 Abe R. Brothers Device for removal of deleterious substances from tobacco smoke
US3370594A (en) * 1965-02-16 1968-02-27 Brown & Williamson Tobacco Filters for tobacco smoke
US3394713A (en) * 1965-10-24 1968-07-30 Philip Morris Inc Cigarette filter
US3502087A (en) * 1968-07-05 1970-03-24 Ernest J Romano Cigarette filter
US3533416A (en) * 1968-05-08 1970-10-13 American Filtrona Corp Tobacco smoke filter
US3621851A (en) * 1969-11-26 1971-11-23 Kata Mfg & Filtering Co Filter for smoker's article

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1619387A (en) * 1925-10-05 1927-03-01 Lester R Waugh Smoking utensil
FR1118860A (en) * 1955-01-05 1956-06-12 R Schneider Ets Device for filtering tobacco smoke
US3081776A (en) * 1960-06-10 1963-03-19 Park Neil Hamill Cigarette coal anchor for filter cigarette
US3370594A (en) * 1965-02-16 1968-02-27 Brown & Williamson Tobacco Filters for tobacco smoke
US3366123A (en) * 1965-10-23 1968-01-30 Abe R. Brothers Device for removal of deleterious substances from tobacco smoke
US3394713A (en) * 1965-10-24 1968-07-30 Philip Morris Inc Cigarette filter
US3533416A (en) * 1968-05-08 1970-10-13 American Filtrona Corp Tobacco smoke filter
US3502087A (en) * 1968-07-05 1970-03-24 Ernest J Romano Cigarette filter
US3621851A (en) * 1969-11-26 1971-11-23 Kata Mfg & Filtering Co Filter for smoker's article

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841338A (en) * 1970-07-23 1974-10-15 British American Tobacco Co Tobacco-smoke filters
US3888160A (en) * 1971-02-01 1975-06-10 Imp Tobacco Group Ltd Tobacco smoke filter
US3854384A (en) * 1971-05-24 1974-12-17 Brown & Williamson Tobacco Method of making tobacco smoke filters
US3865121A (en) * 1971-11-03 1975-02-11 Molins Ltd Cigarette filters
US3752165A (en) * 1971-12-20 1973-08-14 G Harllee Smoke filter plug and process and cigarette made therefrom
US4026306A (en) * 1975-11-06 1977-05-31 American Filtrona Corporation Tobacco smoke filter
US4064791A (en) * 1975-11-06 1977-12-27 American Filtrona Corporation Method and apparatus for making tobacco smoke filter
US4291712A (en) * 1977-11-11 1981-09-29 Sigarettenfabriek Ed. Laurens B.V. Cigarette filter and filter cigarette
US4413641A (en) * 1979-09-07 1983-11-08 Philip Morris Incorporated Cigarette mouthpiece
US4388934A (en) * 1980-06-18 1983-06-21 British-American Tobacco Company Limited Filters
US4492238A (en) * 1981-09-30 1985-01-08 Philip Morris Incorporated Method and apparatus for production of smoke filter components
US4942887A (en) * 1987-06-15 1990-07-24 Fabriques De Tabac Reunies, S.A. Filter mouthpiece for a smoking article
EP0364253A1 (en) * 1988-10-12 1990-04-18 Rothmans International Services Limited Cigarette filter rod elements and cigarettes incorporating such filter rod elements
US4972853A (en) * 1988-10-12 1990-11-27 Sk Hand Tool Corporation Cigarette filter rod elements and cigarettes incorporating such filter rod elements
EP0453299A1 (en) * 1990-04-20 1991-10-23 Rothmans, Benson & Hedges Inc. Cigarette smoke filter
US5495859A (en) * 1993-04-14 1996-03-05 1149235 Ontario Inc. Cigarette smoke filter system
US5497791A (en) * 1993-04-14 1996-03-12 114935 Ontario Inc. Smoker's accessory
US5638833A (en) * 1993-04-14 1997-06-17 1149235 Ontario Inc. Cigarette smoke filter system
US5752527A (en) * 1993-04-14 1998-05-19 Ontario Inc. Smoker's accessory
US7735494B2 (en) 2006-03-03 2010-06-15 Xerosmoke, Llc Tabacco smoking apparatus
US20110036361A1 (en) * 2006-03-03 2011-02-17 Xerosmoke Llc Tobacco smoking apparatus
US20190216131A1 (en) * 2015-07-14 2019-07-18 Dynavap, LLC Diffuser disc and diffuser assembly

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