WO1996024772A1 - An air movement apparatus - Google Patents
An air movement apparatus Download PDFInfo
- Publication number
- WO1996024772A1 WO1996024772A1 PCT/AU1996/000064 AU9600064W WO9624772A1 WO 1996024772 A1 WO1996024772 A1 WO 1996024772A1 AU 9600064 W AU9600064 W AU 9600064W WO 9624772 A1 WO9624772 A1 WO 9624772A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- air
- barrier member
- central passageway
- pressure surface
- rim
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/088—Ceiling fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/12—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit being adapted for mounting in apertures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
- F04D29/526—Details of the casing section radially opposing blade tips
Definitions
- This invention relates to an air movement apparatus which can include ceiling fans, wall fans, ventilating devices such as exhaust fans, and the like, and where the apparatus does not have externally rotating blades.
- Air movement devices such as ceiling fans, extractor fans and the like, conventionally have a number of extending fan blades which rotate at varying speeds.
- the fan blades radiate from a central hub portion and the hub is connected to a shaft which is driven by an electric motor.
- the invention resides in an air movement apparatus comprising a curved body about which air can circulate, the curved body having a rim and, in use, having a lower pressure surface on one side of the rim, and a higher pressure surface on the other side of the rim, an air outlet to blow air over the lower pressure surface, an air inlet to suck air in from the higher pressure surface, and air acceleration means to move air from the air inlet to the air outlet.
- the air acceleration means functions to keep the air moving about the curved body.
- the circulating air will entrain adjacent air, and when the entrained air passes over the high pressure surface, the entrained air will be ejected downwardly to provide the air movement.
- a portion of the air circulates about the body and this portion entrains and ejects adjacent air to provide the air movement effect.
- the apparatus can be quite compact in shape making it useful for smaller dwellings having a lower ceiling, and it is also noted that air is entrained along the lower pressure surface and not only at a position immediately above the apparatus.
- the curved body is toroidal in configuration. That is, the curved body can have a doughnut-type shape.
- the toroidal body need not be circular in cross-section, and the particular shape of the toroidal body may be varied depending on a number of factors these factors including the speed of air circulating around the body and the volume of air desired to be moved.
- the cross-section of the toroidal body is of a design which is flattened along the lower pressure surface.
- the toroidal body has a rim with the lower pressure surface being on one side of the rim and the higher pressure surface being on the other side of the rim (it being appreciated that the pressures will only be effected when air is circulated about the toroidal body) .
- the toroidal body may be formed from various suitable materials such as metal, plastic and composites.
- the toroidal body may be entirely solid or hollow.
- the toroidal body may be formed from opaque or clear material.
- a illuminating device may be positioned within the toroidal body and in this embodiment, the toroidal body may be made from clear material, or a portion of the toroidal body may be formed from clear material to allow light to pass therethrough.
- the air outlet may comprise a single outlet or a number of spaced outlets.
- the air outlet is a single outlet.
- the outlet can be positioned adjacent one end of the central passageway which extends through the toroidal body. This end of the passageway is the one which communicates with the lower pressure surface such that air passes through the outlet and over the lower pressure surface.
- the air outlet may comprise an annular slot.
- the air inlet may comprise the other end of the central passageway defined by the toroid.
- a first barrier member may be provided adjacent the said one end of the central passageway.
- the first barrier member may have a peripheral edge spaced from the body to define the annular opening of the air outlet.
- the barrier member may have a portion which extends at least partially into the central passageway. This portion may have a configuration to facilitate movement of air through the central passageway and through the air outlet. In one form, the portion may be cone-like in shape.
- the first barrier member may be attached to a shaft.
- the barrier member may be slidingly attached to the shaft such that it can "float" above the central passageway.
- the size of the air outlet can vary depending on the position of the first barrier member, and if the first barrier member is allowed to "float", the size of the air outlet can vary depending on the volume and velocity of air passing through the air outlet.
- the air acceleration means may comprise a bladed fan.
- the bladed fan may comprise a hub and a number of extending blades.
- the blades at least are located entirely within the central passageway.
- the blades may be attached to the hub and the hub may comprise the portion of the barrier member which extends into the central passageway.
- the shaft may be coupled to a motor and turned to turn the first barrier member and therefore the blades.
- the first barrier member may be non-rotatably mounted and the air acceleration means may comprise a bladed fan which is mounted for rotation relative to the first barrier member.
- the bladed fan may be of any suitable type and may include an axial fan, a centrifugal fan, or a mixed flow fan.
- a second barrier member may be positioned adjacent the other end of the central passageway.
- the second barrier member may be plate-like, mesh-like, grid ⁇ like and may function to prevent fingers from being inserted into the central passageway.
- the air In order to facilitate movement of air around the body, it is desirable to ensure that the air is turbulent. Thus, as air exits from the air outlet, it is preferred that the air is cause to bend and roll into a vortex. This can be assisted by having a recess or step formed in the body and adjacent the air outlet.
- the recess or step can cause the air jet to entrain and evacuate the air under itself which can cause the air jet to bend and roll into a vortex.
- the recess or step preferably extends the length of the air outlet. Thus, if the air outlet is annular, it is preferred that the recess or step is also annular.
- the apparatus may include a heater to heat air.
- the heater may comprise a heating element.
- the heating element may be positioned in the central passageway to heat air as it passes through the passageway. If the heater is positioned in the central passageway, it is preferred that the second barrier member is provided to prevent inadvertent touching of the heater.
- cooling means such as cooling coils may be provided. The cooling means may also be located in the central passageway to cool air as it passes along the passageway.
- the apparatus may be associated with a shroud.
- the shroud may comprise an annular band which extends about the toroid and generally about the rim area of the toroid. The spacing between the shroud and the outer surface of the body may vary, but the spacing may approximate the diameter of the vortices.
- the shroud may form part of the apparatus.
- the apparatus may be mounted in an opening in a wall or ceiling, with the walls of the opening able to function as the shroud.
- Figure 1 shows a curved body of an air movement apparatus according to an embodiment of the invention.
- Figure 2 shows the body of Figure 1 with an air acceleration means positioned within the body.
- Figure 3 shows the apparatus of Figure 2 and including a first barrier member.
- Figure 4 is an upper view of the assembled apparatus of Figures 1, 2 and 3.
- Figure 5 is a side section view of an air movement apparatus.
- Figure 6 is a side section view of an air movement apparatus.
- Figure 1 shows a curved body of an air movement apparatus 10.
- the curved body is in the shape of a toroid having a central passageway 11 and an outer rim 12.
- Figures 1 to 4 also show an annular recess or step 13 in body 10 the function of which will be described in greater detail with reference to Figures 5 and 6.
- Body 10 may be formed from any desirable material such as expanded plastics, other plastics or metal.
- Body 10 may be entirely solid, entirely hollow, or partially solid and partially hollow. The width and height of body 10 can vary to suit from very large sizes to very small sizes.
- FIG 2 shows an air acceleration means in the form of a bladed fan 14 having a central hub 15 and a number of spaced overlapping blades 16.
- Bladed fan 14 has a shaft 18 attached to motor 17 which can drive fan 14.
- the upper portion of central passageway 11 is partially closed with a first barrier member 19.
- First barrier member 19 overlies the upper portion of central passageway 11.
- the first barrier member has a portion 20 which extends into the central passageway 11. It can be seen that the first barrier member is frusto-conical in configuration.
- the peripheral edge 21 of first barrier member 19 is spaced inwardly from the outer wall of body 10 to define an annular blowing slot 22 which forms the air outlet.
- the top of barrier member 1 9 has a post 23 to attach it to a ceiling or other support.
- FIG. 5 there are shown cross-section views of the air movement apparatus.
- Figure 5 better illustrates the annular blowing slot 22, the position of fan 14, and blades 16.
- Figures 5 and 6 also illustrate the cross-section shape of body 10 and it can be seen that the cross-section shape is slightly flattened on a bottom portion.
- annular blowing slot 22 blows high speed air onto curved body 10. The air follows the curvature of body 10 and passes along body 10 from blowing slot 22 past rim 12 and back into the central passageway 11 through inlet 24.
- the upper part 25 of body 10 (that is the part between blowing slot 22 and rim 12) ,can be seen as a lower pressure surface, as air blowing through slot 22 passes over body 10 and the surface area of body 10 increases thereby lowering the air pressure.
- air pressure By lowering the air pressure, adjacent ambient air is entrained or mixed with the air passing over the lower pressure surface 25.
- the surface area that the air moves along decreases or converges and this part of body 10 can be seen as the higher pressure surface 26.
- the entrained or mixed air is ejected from the circulating air flow and at a position below the apparatus.
- turbulence such as vortices.
- This turbulence can be introduced by providing a roughened surface to body 10.
- the annular recess or step 13 also functions to form turbulence.
- the high speed jet of air rushes over recess or step 13, it entrains and evacuates the air under itself. This causes the jet to bend and roll into a vortex at the beginning of an upper part or shoulder 27 of the lower pressure surface 25. This is called a ring vortex as it rings the top side of body 10. If the jet is high speed, several of these vortices form and spin outwardly over shoulder 27.
- the rotating air is of lower pressure than ambient air due to its speed. Adjacent ambient air is entrained into the vortices which grow in diameter as they travel outwardly. The vortices, due to their low pressure, also follow the curved surface of body 10 and roll around the body to the underside 26. Once the vortices pass rim 12, they cannot remain attached to the underside of body 10 for much distance, as because the vortices are travelling along a decreasing surface area, the pressure rises. The higher pressure causes the air to be ejected out and down. A portion of the air is however passed into central passageway 11 and circulated or re-circulated about body 10.
- a second barrier member in the form of plate, grill, mesh and the like 28 can be positioned adjacent inlet 24.
- the function of plate 28 is primarily to prevent fingers being inserted into central passageway 11, although plate 28 may also function to facilitate in defining the shape and size of inlet 24.
- the toroidal body may be hollow and may include internal lights 29. These lights may be in the form of circular fluorescent lights. If lights are positioned within body 10, it is preferred that body 10 is either made entirely of clear material, or that at least a lower portion of body 10 is formed of clear material.
- central passageway 11 may be positioned a heating element 35 to heat air as it passes along the passageway.
- a cooling coil or other type of cooling means may be positioned within the central passageway.
- First barrier member 19 may be slidably attached to post 23 or may be otherwise slidingly attached such that it can move up and down to increase or decrease the size of annular blowing slot 22.
- Barrier member 19 may "float" above body 10 and it is found that barrier member 19 self regulates the size of the annular blowing slot depending primarily on the volume and velocity of air passing therethrough. Although not wishing to be bound by theory, it appears that if the annular blowing slot is too large for the volume and velocity of air passing therethrough, some turbulating air may pass back into the passageway through the blowing slot which is undesirable. By having the barrier member "floating", it can automatically tune the annular blowing slot to the correct size.
- a shroud 32 can be provided.
- Shroud 32 is in the form of an annular band which may be formed from metal or plastic and which extends about body 10 at the rim portion 12.
- Shroud 32 is spaced away from body 10 by a distance approximately the size of a ring vortex passing rim 12.
- Shroud 32 minimises air looping back from immediately below rim 12 to immediately above rim 12.
- the walls of the opening may themselves form shroud 32 and therefore a separate shroud may not be necessary.
- the apparatus may be attached to a pair of opposed pins to allow it to be swung around by 180°.
- the apparatus could be mounted in a wall and could either function as an air blower, or turned 180° to function as an air exhaust.
- Struts and other means of holding the various parts together can be provided and the struts have been omitted for the sake of clarity.
- the fan 14 can be multi- staged to increase jet discharge speeds if required.
- Figures 5 and 6 show a fan 14 which ejects air substantially at 45° and the step 13 facilitates bending and tubulating of the air. If blowing slot 22 is substantially horizontal relative to the portion of body 10 immediately next to blowing slot 22, and if a centrifugal fan is provided, the air may be sufficiently turbulent to form the vortexes without requiring step 13.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019970705499A KR19980702104A (en) | 1995-02-10 | 1996-02-12 | Air shifter |
EP96901646A EP0834019A4 (en) | 1995-02-10 | 1996-02-12 | An air movement apparatus |
BR9607498A BR9607498A (en) | 1995-02-10 | 1996-02-12 | Air movement apparatus |
JP8523836A JPH10513524A (en) | 1995-02-10 | 1996-02-12 | Air moving device |
AU46146/96A AU705065B2 (en) | 1995-02-10 | 1996-02-12 | An air movement apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPN1027 | 1995-02-10 | ||
AUPN1027A AUPN102795A0 (en) | 1995-02-10 | 1995-02-10 | Circulation control fan |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996024772A1 true WO1996024772A1 (en) | 1996-08-15 |
Family
ID=3785387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1996/000064 WO1996024772A1 (en) | 1995-02-10 | 1996-02-12 | An air movement apparatus |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0834019A4 (en) |
JP (1) | JPH10513524A (en) |
KR (1) | KR19980702104A (en) |
CN (1) | CN1068098C (en) |
AU (1) | AUPN102795A0 (en) |
BR (1) | BR9607498A (en) |
CA (1) | CA2212361A1 (en) |
WO (1) | WO1996024772A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103244470A (en) * | 2011-05-11 | 2013-08-14 | 任文华 | Bladeless fan |
JP6755725B2 (en) * | 2016-06-21 | 2020-09-16 | パナソニック株式会社 | Blower and air purifier with ventilation function |
WO2018087797A1 (en) * | 2016-11-08 | 2018-05-17 | 日本電産株式会社 | Centrifugal ceiling fan and impeller module |
JP6496873B2 (en) * | 2018-08-09 | 2019-04-10 | シャープ株式会社 | Blower |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2583374A (en) * | 1950-10-18 | 1952-01-22 | Hydraulic Supply Mfg Company | Exhaust fan |
US2617348A (en) * | 1949-12-02 | 1952-11-11 | O A Sutton Corp Inc | Ventilating unit |
AU5958290A (en) * | 1989-07-19 | 1991-02-22 | Keller Lufttechnik Gmbh + Co. Kg | Radial-flow fan unit fitted inside an air-intake duct |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2640646A (en) * | 1949-04-07 | 1953-06-02 | Cory Corp | Electric circulating floor fan |
FR1095114A (en) * | 1953-03-12 | 1955-05-27 | Sulzer Ag | Radiant heating installation |
DE1301871B (en) * | 1965-02-15 | 1969-08-28 | Baumann Ludwig | Arrangement of an iris diaphragm for a ventilation device |
DE3143907C2 (en) * | 1981-11-05 | 1985-11-28 | Kurt 6842 Bürstadt Kleber | Steam cabinet |
JPH04183996A (en) * | 1990-11-15 | 1992-06-30 | Sanyo Electric Co Ltd | Motor-driven blower |
-
1995
- 1995-02-10 AU AUPN1027A patent/AUPN102795A0/en not_active Abandoned
-
1996
- 1996-02-12 KR KR1019970705499A patent/KR19980702104A/en not_active Application Discontinuation
- 1996-02-12 BR BR9607498A patent/BR9607498A/en not_active IP Right Cessation
- 1996-02-12 CN CN96191880A patent/CN1068098C/en not_active Expired - Fee Related
- 1996-02-12 JP JP8523836A patent/JPH10513524A/en active Pending
- 1996-02-12 WO PCT/AU1996/000064 patent/WO1996024772A1/en not_active Application Discontinuation
- 1996-02-12 EP EP96901646A patent/EP0834019A4/en not_active Withdrawn
- 1996-02-12 CA CA002212361A patent/CA2212361A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2617348A (en) * | 1949-12-02 | 1952-11-11 | O A Sutton Corp Inc | Ventilating unit |
US2583374A (en) * | 1950-10-18 | 1952-01-22 | Hydraulic Supply Mfg Company | Exhaust fan |
AU5958290A (en) * | 1989-07-19 | 1991-02-22 | Keller Lufttechnik Gmbh + Co. Kg | Radial-flow fan unit fitted inside an air-intake duct |
Non-Patent Citations (4)
Title |
---|
DERWENT ABSTRACT, Accession No. B7147E/07, Class Q56; & SU,A,821 752, (AZOV BLACK SEA AGRI), 18 April 1981. * |
DERWENT ABSTRACT, Accession No. C8055D/13, Class Q12; & SU,A,748 032, (OMNIBUS CONS EXPER), 25 July 1980. * |
PATENT ABSTRACTS OF JAPAN, Vol. 95, Nr. 09; & JP,A,07 158 587, (SHIBAURA ENG WORKS CO LTD), 20 June 1995. * |
See also references of EP0834019A4 * |
Also Published As
Publication number | Publication date |
---|---|
CN1173913A (en) | 1998-02-18 |
JPH10513524A (en) | 1998-12-22 |
BR9607498A (en) | 1997-12-23 |
CA2212361A1 (en) | 1996-08-15 |
KR19980702104A (en) | 1998-07-15 |
EP0834019A1 (en) | 1998-04-08 |
AUPN102795A0 (en) | 1995-03-09 |
CN1068098C (en) | 2001-07-04 |
EP0834019A4 (en) | 1999-06-09 |
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