EP2086889A1 - Device and process for improving mixing in the uv disinfection of liquids - Google Patents
Device and process for improving mixing in the uv disinfection of liquidsInfo
- Publication number
- EP2086889A1 EP2086889A1 EP07786030A EP07786030A EP2086889A1 EP 2086889 A1 EP2086889 A1 EP 2086889A1 EP 07786030 A EP07786030 A EP 07786030A EP 07786030 A EP07786030 A EP 07786030A EP 2086889 A1 EP2086889 A1 EP 2086889A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- mixing device
- flow direction
- flow
- main flow
- 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.)
- Withdrawn
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 22
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 8
- 230000005855 radiation Effects 0.000 claims description 14
- 238000005192 partition Methods 0.000 claims description 4
- 230000000249 desinfective effect Effects 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000002351 wastewater Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
- C02F1/325—Irradiation devices or lamp constructions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/322—Lamp arrangement
- C02F2201/3225—Lamps immersed in an open channel, containing the liquid to be treated
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/32—Details relating to UV-irradiation devices
- C02F2201/328—Having flow diverters (baffles)
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/02—Fluid flow conditions
- C02F2301/024—Turbulent
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
Definitions
- the present invention relates to a device having the features of the preamble of claim 1 and a method for UV disinfection of liquids.
- Fluid stream receives a certain minimum dose of UV radiation.
- energy consumption of UV disinfection systems is an important criterion for the special economy, not excessively high radiation power should be used. It is therefore essential that the liquid flow is mixed so well that each volume element receives the same radiation dose and no flow paths are formed in which the radiation dose is too low.
- Various solutions are known from the prior art for this purpose.
- baffle plates are used in the free cross section of the device, which are arranged in front of the radiators or on the radiators. These baffles induce a turbulent flow which deflects volume elements from the center of the free flow cross-section and brings them close to the surface of the radiators.
- radiators are arranged with their longitudinal axis transversely to the flow direction.
- the radiators themselves induce a turbulent flow.
- the individual volume elements of the liquid to be treated are forced through the gap formed between two adjacent radiators and flow behind them into a larger free cross section, up to the next row of UV radiators. This change in cross section already causes a thorough mixing.
- an electric motor driven mixing device is arranged between the inflow and the at least one UV emitter, which is adapted to generate a transverse flow with at least one velocity component transverse to the main flow direction, the mixing of the liquid immediately before the UV disinfection is improved.
- the mixing device has a propeller with an axis of rotation which is oriented at an angle (a) of 90 ° to the main flow direction, mixing can be achieved substantially without influencing the hydrodynamic resistance in the channel. Liquid is also sucked out of the wall area of the channel and mixed when the mixing device has a suction side and a pressure side and the distance between the suction side and a wall of the channel is lower is the distance between the pressure side and a wall of the channel.
- a particularly good efficiency results when the mixing device has a propeller and a nozzle ring surrounding the propeller. This is further improved if the mixing device is connected on the suction side to a separated by means of a partition wall part flow, because a short-circuit flow between the suction and pressure side is prevented.
- a particularly uniform mixing in the channel is achieved when two mixing devices are arranged on opposite sides of the channel.
- the at least one mixing device can be oriented at an angle other than 90 ° to the main flow direction.
- a temporary operation of the mixing device without disturbing the flow through the channel is possible when the mixing device is arranged in a side channel branching off from the channel for generating a partial flow, wherein the side channel upstream of the UV emitter re-opens into the channel and the partial flow in a Angle to the main flow direction is passed into the channel.
- the side channel can be disconnected by gate valves or valves when the mixing device is out of operation.
- the mixing device is arranged outside the free cross section of the channel.
- a method for disinfecting liquids comprising the steps of a) introducing a volume flow of the liquid into a channel with a main flow direction, b) generating a velocity component transverse to the main flow direction by means of an electric motor-driven mixing device, and c) irradiation of the volume flow with a UV radiation, a high degree of disinfection is achieved in relation to the radiation power used. If the mixing device is arranged in a separate partial flow and that the velocity component takes place by introducing the partial flow at an angle into the remaining flow, the mixing device can be switched on and off as required.
- Fig. 1 An open channel of a UV disinfection system in a plan view
- Fig. 2 The channel of Figure 1 in a cross section from the side;
- Fig. 3 The channel according to Figure 1 and Figure 2 in a cross section along the line III. from FIG. 1, -
- Fig. 4 A channel according to Figure 1 with two mixing devices
- Fig. 5 a flume according to Figure 1 with a mixing device with an inclined axis;
- Fig. 6 A channel according to Figure 1 with a mixing device in a side channel; such as
- Fig. 7 A device with a separated by a partition partial flow.
- FIG. 1 shows a UV disinfection system for the drainage of a wastewater treatment plant in a plan view.
- the Disinfection plant is of the type with an open channel 1, in which a number of UV lamps 2 are used.
- the UV emitters 2 are designed as low-pressure UV emitters and oriented with their longitudinal axis parallel to the flow direction.
- a first weir 3 and second weir 4 regulate the water level in the channel 1.
- a sensor 5 monitors the water level.
- a mixing device 6 is arranged, which generates a flow in the direction of the flow arrows 8 according to the design of an impeller via an electromotive driven propeller 7. This flow is oriented transversely to the flow illustrated with the flow arrows 9.
- the flow arrows 9 indicate the flow through the channel 1 solely due to the existing in the sewage system slope. The flow in the direction of the arrows 9 is almost laminar.
- FIG. 2 shows the channel according to FIG. 1 in a cross section in the main flow direction 9. Identical components are provided with the same reference numerals.
- the mixing device 6 has, in addition to the propeller 7, a nozzle ring 11 surrounding the propeller concentrically. This Düsering 11 promotes the formation of the cross flow 8 during operation. It also causes the water is sucked out of the immediate vicinity of the left side wall of the channel 1 in the direction of flow and also sets there is no steady flow.
- FIG. 3 shows the arrangement according to FIG. 1 and FIG. 2 in a cross section along the line III-III. from FIG. 1
- the UV emitters 2 are seen in the flow direction, ie in the illustration according to FIG. 3, round and elongate in cross-section.
- a number of UV lamps (here: 32) are so arranged so that they fill the free cross-section of the channel 1 evenly to the intended maximum water level.
- the mixing device 6 which is arranged in the flow direction in front of the UV emitters 2 and induces a transverse flow 8, causes turbulences during operation, which prevent individual microorganisms from traveling the entire path through the UV emitters 2 along such a laminar flow path.
- the mixing by the cross flow 8 therefore causes a better exposure of the microorganisms with UV radiation. In this way, the UV dose delivered into each individual volume element of the wastewater stream becomes almost the same. The irradiation of the individual volume elements is thus more uniform.
- the radiation power can be reduced, so that the energy consumption is reduced.
- the reduction of the radiation power is greater than the driving power for the mixing device 6, so that there is an economic advantage. With unchanged radiation power, an improved disinfection effect of up to 25% has been observed through the use of the mixing device 6.
- FIG. 4 shows another embodiment of the present invention.
- a total of 2 mixing devices 12 and 13 are provided, which are arranged at 2 in the flow direction of the main flow 9 consecutive positions.
- the mixing device 12 causes a transverse flow 8, which is directed to the right as in Figure 1.
- the mixing device 13 causes a cross flow in the opposite direction, which is marked 8-.
- the electrical power that is used to generate the cross flows 8 and 8- is distributed to the two drive motors of the mixing devices 12 and 13.
- both mixing devices can each have approximately half the electrical power of the mixing device 6. This configuration is advantageous in some applications.
- FIG. 5 shows an arrangement according to FIG. 1.
- a mixing device 14 is arranged in an angle oriented at 90 ° to the main flow direction 9. Accordingly, an obliquely directed against the longitudinal axis flow 15 is formed.
- the oblique transverse flow 15 can as in Figure 5 a
- the mixing device 14 can also be aligned in the other direction, so that a velocity component is formed opposite to the main flow direction 9.
- the flow through the channel 1 is then slowed down a bit. It forms a dynamic resistance. However, it is expected that the mixing will be more intense.
- two mixing devices can also be arranged on opposite sides of the channel 1 with an angle of inclination ⁇ differing from 90 °. The mixing of the wastewater to be treated is thereby further improved.
- FIG. 6 shows an embodiment in which a partial stream 16 is branched off from the wastewater stream to be treated and conducted in a side channel 17.
- a propeller 18 which works here as a mixing device and which accelerates the partial flow 16 at an oblique angle in the main stream of the channel 1 initiates.
- the free cross-section in the main flow direction 9 from the first weir 3 to the UV lamps 2 is not affected by internals in this embodiment.
- the propeller 12 with open or closed side channel remain out of service, without the functionality of the UV disinfection system would otherwise be affected by aerodynamically obstructing internals in the channel 1.
- This embodiment makes it possible to operate the propeller 18 only for special requirements, for example, if a particular turbidity or a particularly high bacterial load is detected.
- FIG. 7 shows an embodiment with a dividing wall 20 within the channel 1, which also branches off a partial flow and supplies it to a mixing device 21.
- a hydraulic short circuit between the suction side and the pressure side of the mixing device 21 is excluded. This embodiment is particularly energy-saving.
Landscapes
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006052922A DE102006052922B4 (en) | 2006-11-08 | 2006-11-08 | Apparatus and method for improving the mixing in the UV disinfection of liquids |
PCT/EP2007/006198 WO2008055552A1 (en) | 2006-11-08 | 2007-07-12 | Device and process for improving mixing in the uv disinfection of liquids |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2086889A1 true EP2086889A1 (en) | 2009-08-12 |
Family
ID=38662721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07786030A Withdrawn EP2086889A1 (en) | 2006-11-08 | 2007-07-12 | Device and process for improving mixing in the uv disinfection of liquids |
Country Status (11)
Country | Link |
---|---|
US (1) | US8696898B2 (en) |
EP (1) | EP2086889A1 (en) |
JP (1) | JP2010509042A (en) |
KR (1) | KR20090089374A (en) |
CN (1) | CN101553433B (en) |
AU (1) | AU2007317014B2 (en) |
CA (1) | CA2668964C (en) |
DE (1) | DE102006052922B4 (en) |
HK (1) | HK1134479A1 (en) |
NZ (1) | NZ577468A (en) |
WO (1) | WO2008055552A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0711746D0 (en) * | 2007-06-19 | 2007-07-25 | Snowball Malcolm R | Fluid disinfection apparatus and method |
US20110233142A1 (en) * | 2008-03-12 | 2011-09-29 | Grossman Lorne D | Water Purification System and Method |
CN102227256B (en) | 2008-11-26 | 2014-08-27 | 卡尔冈碳素公司 | Method and apparatus for use of mixing elements in wastewater/ recycle water uv disinfection system |
CN102241426B (en) * | 2010-05-14 | 2015-08-26 | 福建新大陆环保科技有限公司 | A kind of ultraviolet fluid radiation system |
US9409170B2 (en) | 2013-06-24 | 2016-08-09 | Hewlett-Packard Development Company, L.P. | Microfluidic mixing device |
WO2018009184A1 (en) | 2016-07-06 | 2018-01-11 | Hewlett-Packard Development Company, L.P. | Microfluidic mixer |
DE102018124666A1 (en) * | 2018-10-05 | 2020-04-09 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for stimulating the growth of biomass contained in a liquid within a bioreactor |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE909292C (en) * | 1950-11-28 | 1954-04-15 | Siemens Ag | Device for ultraviolet irradiation of liquids in flow tubes, in particular of liquid food of all kinds |
DE2307877C3 (en) * | 1973-02-17 | 1982-01-14 | Reiner Dipl.-Ing. 7312 Kirchheim Wiest | Device for sterilizing liquids |
JPS6146292A (en) * | 1984-08-09 | 1986-03-06 | Iwasaki Electric Co Ltd | Water treating apparatus |
DE3740005A1 (en) | 1987-11-25 | 1989-06-08 | Katadyn Produkte Ag | DEVICE FOR DISINFECTING WASTEWATER |
JPH01299693A (en) * | 1988-05-27 | 1989-12-04 | Fumio Denpo | Water treatment device |
US5292088A (en) * | 1989-10-10 | 1994-03-08 | Lemont Harold E | Propulsive thrust ring system |
JPH04190887A (en) * | 1990-11-26 | 1992-07-09 | Mitsubishi Petrochem Co Ltd | Ultraviolet disinfecting device and cleaning method thereof |
US5997812A (en) * | 1996-06-20 | 1999-12-07 | Coolant Treatment Systems, L.L.C. | Methods and apparatus for the application of combined fields to disinfect fluids |
CA2295944A1 (en) * | 1997-07-03 | 1999-01-14 | August Schmid | Sterilizing device for a medium, preferably water |
US6015229A (en) | 1997-09-19 | 2000-01-18 | Calgon Carbon Corporation | Method and apparatus for improved mixing in fluids |
JPH11137578A (en) * | 1997-11-06 | 1999-05-25 | Osada Res Inst Ltd | Water storage tank |
US20020023866A1 (en) * | 2000-12-31 | 2002-02-28 | Barnes Ronald L. | Assembly for purifying water |
JP3902304B2 (en) * | 1997-12-24 | 2007-04-04 | 昇 阪野 | UV irradiation equipment |
US6419821B1 (en) * | 2000-02-25 | 2002-07-16 | Waterhealth International, Inc. | Apparatus for low cost water disinfection |
US6403030B1 (en) * | 2000-07-31 | 2002-06-11 | Horton, Iii Isaac B. | Ultraviolet wastewater disinfection system and method |
KR20030016875A (en) * | 2001-08-22 | 2003-03-03 | 최영규 | Water treatment system with side stream ozone water |
US6657205B1 (en) * | 2002-07-17 | 2003-12-02 | Vast Light Ltd. | Turbine-boosted ultraviolet-radiation sterilizing fluid processor |
FI120234B (en) * | 2004-01-27 | 2009-08-14 | Waterix Oy | Apparatus and method for aerating / mixing water |
US7517459B2 (en) * | 2004-07-15 | 2009-04-14 | Usa Pelican Inc. | Vessel with oxygenation system and decontamination method |
US20060049116A1 (en) * | 2004-09-03 | 2006-03-09 | Subramanian Krupakar M | Method and apparatus for bubble glow discharge plasma treatment of fluids |
CN201254494Y (en) * | 2005-03-30 | 2009-06-10 | 孙树林 | Activate type dissolved oxygen aerator |
-
2006
- 2006-11-08 DE DE102006052922A patent/DE102006052922B4/en not_active Expired - Fee Related
-
2007
- 2007-07-12 JP JP2009535581A patent/JP2010509042A/en active Pending
- 2007-07-12 US US12/513,438 patent/US8696898B2/en not_active Expired - Fee Related
- 2007-07-12 EP EP07786030A patent/EP2086889A1/en not_active Withdrawn
- 2007-07-12 AU AU2007317014A patent/AU2007317014B2/en not_active Ceased
- 2007-07-12 CN CN200780041290.2A patent/CN101553433B/en not_active Expired - Fee Related
- 2007-07-12 CA CA2668964A patent/CA2668964C/en not_active Expired - Fee Related
- 2007-07-12 NZ NZ577468A patent/NZ577468A/en not_active IP Right Cessation
- 2007-07-12 KR KR1020097011762A patent/KR20090089374A/en not_active Application Discontinuation
- 2007-07-12 WO PCT/EP2007/006198 patent/WO2008055552A1/en active Application Filing
-
2010
- 2010-03-11 HK HK10102551.5A patent/HK1134479A1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2008055552A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2668964A1 (en) | 2008-05-15 |
KR20090089374A (en) | 2009-08-21 |
CA2668964C (en) | 2015-02-03 |
AU2007317014A1 (en) | 2008-05-15 |
WO2008055552A1 (en) | 2008-05-15 |
US20100089839A1 (en) | 2010-04-15 |
HK1134479A1 (en) | 2010-04-30 |
NZ577468A (en) | 2011-09-30 |
DE102006052922B4 (en) | 2012-02-23 |
JP2010509042A (en) | 2010-03-25 |
DE102006052922A1 (en) | 2008-05-29 |
CN101553433B (en) | 2013-08-21 |
AU2007317014B2 (en) | 2013-07-18 |
US8696898B2 (en) | 2014-04-15 |
CN101553433A (en) | 2009-10-07 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MEESE, WOLF-DIETRICH Inventor name: JONES-PRICHARD, GEOFF |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: JONES-PRICHARD, GEOFF Inventor name: MEESE, WOLF-DIETRICH |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20100205 |
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Owner name: ITT MANUFACTURING ENTERPRISES, INC. |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: XYLEM IP HOLDINGS LLC |
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Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20160202 |