GB2363975A - Reflux vacuum cleaner with motor cooling portion - Google Patents

Reflux vacuum cleaner with motor cooling portion Download PDF

Info

Publication number
GB2363975A
GB2363975A GB0024814A GB0024814A GB2363975A GB 2363975 A GB2363975 A GB 2363975A GB 0024814 A GB0024814 A GB 0024814A GB 0024814 A GB0024814 A GB 0024814A GB 2363975 A GB2363975 A GB 2363975A
Authority
GB
United Kingdom
Prior art keywords
cooling
vacuum cleaner
air
motor
impeller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0024814A
Other versions
GB2363975B (en
GB0024814D0 (en
Inventor
Sang-Yong Lee
Jang-Keun Oh
Jeong-Gon Song
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Gwangju Electronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Samsung Gwangju Electronics Co Ltd filed Critical Samsung Gwangju Electronics Co Ltd
Publication of GB0024814D0 publication Critical patent/GB0024814D0/en
Publication of GB2363975A publication Critical patent/GB2363975A/en
Application granted granted Critical
Publication of GB2363975B publication Critical patent/GB2363975B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2889—Safety or protection devices or systems, e.g. for prevention of motor over-heating or for protection of the user
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/22—Mountings for motor fan assemblies
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/14—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum cleaning by blowing-off, also combined with suction cleaning
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
    • A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
    • A47L5/362—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back of the horizontal type, e.g. canister or sledge type
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/02—Nozzles
    • A47L9/08—Nozzles with means adapted for blowing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
  • Electric Suction Cleaners (AREA)

Abstract

A reflux vacuum cleaner, which repeatedly recycles filtered air back through the cleaner, comprises a motor 140 driven internal suction impeller 130, a cleaning air circulation path defined by suction and discharge passages, 101, 102, corresponding connecting pipe 160 passages 161, 162 and corresponding brush 150 passages 151, 152, and a motor cooling means 200, possibly comprising a substantially separate air circulation path, provided between the suction and discharge passages 101,102. Also disclosed is a vacuum cleaner as described above, further featuring a means 230, such as a separate fan or blower, for driving cooling air through a motor cooling passage, which cleaner need not feature a connecting pipe 160 and brush 150. A discharge passage 214 may allow air from the cooling path to enter the cleaning air circulation path after it has taken heat from the motor 140. The cooling means may comprise a cooling chamber 212 with the motor 140 located therein and the impeller located outside of a cooling chamber 212 behind a partition 201, and a fan or blower 230 to suck in external air through a grill 250.

Description

2363975 A Reflux Cleaner The present invention relates to a vacuum cleaner
and more particularly, to an exhaust reflux cleaner capable of cooling an impeller motor which it contains.
Generally, a vacuum cleaner collects foreign substances such as dust, etc.
by sucking in ambient air from a cleaning surface and discharging the sucked air while filtering out foreign substances with a dust collecting bag and an exhaust filter Since such a vacuum cleaner may discharge exhaust air with an offensive odour, a so-called reflux vacuum cleaner has been devised, the purpose of which is to reduce emission of offensive odours by re-circulating the air which is discharged from the vacuum cleaner body.
Referring to Figure 1, a conventional reflux vacuum cleaner includes a body having a suction passage 11 and a discharge passage 12, a dust collecting chamber 13 located in the suction passage 11, an impeller 14 rotated by a motor 15, a connecting pipe 20 having a suction pipeline 21 and a discharge pipeline 22 respectively interconnected to the suction and discharge passages 11 and 12, and brush 23 formed at an end of the connecting pipe 20.
In the conventional reflux vacuum cleaner constructed as above, ambient air in the region of the cleaning surface is sucked in through the brush 23 by the rotation of the motor 15 and the impeller 14 After being sucked in, the air is passed through the suction pipeline 21 of the connecting pipe 20 and the dust collecting bag 13, while the foreign substances such as dust or dirt are absorbed and filtered out by the dust collecting bag 13.
After the foreign substances are filtered out by the dust collecting bag 13, the air is discharged through the discharge passage 12, discharge pipeline 22, and brush 2 23 The discharged air is then sucked in again through the brush 23, together with the ambient dust or dirt around the brush 23.
The conventional reflux vacuum cleaner, however, has a structure in which the air sucked in through the brush cools the motor 15 during its circulation Here, as the air is exposed to the heat of the driving motor 15, the air is heated And as the heated air is recirculated into the vacuum cleaner, the cooling efficiency deteriorates more and more As the vacuum cleaner is driven for a long period of time, the operation efficiency of the vacuum cleaner deteriorates more seriously due to the heated motor Accordingly, the suction performance and efficiency of the vacuum cleaner are affected.
With the object of offering improved performance, the present invention, according to one aspect thereof, provides a reflux vacuum cleaner having improved motor cooling efficiency by using external ambient air for motor cooling.
According to a particular aspect of the invention, a reflux vacuum cleaner includes an impeller built in a vacuum cleaner body for rotation by a motor; a suction passage and a discharge passage interconnected to the vacuum cleaner body for defining an air circulation path for air which is sucked in by a rotational force of the impeller; a connecting pipe having a suction pipeline and a discharge pipeline respectively connected to the suction and discharge passages; a suction brush interconnected with the connecting pipe; and a cooling portion provided between the suction and discharge passages for cooling the motor.
The cooling portion may include a cooling chamber having a partition which partitions an inner space thereof into a first space and a second space in a manner such that the impeller is located in the first space and the motor is located in the second space; a cooling blower located in the second space facing the impeller and connected with the motor so as to suck in external air toward the motor and the impeller; a grille disposed on the vacuum cleaner body in registering with the cooling blower, the grille having a plurality of holes formed therein; and a first discharge pipe and a second 3 discharge pipe located in the first and second spaces for discharging the air which is sucked in by the impeller and the cooling blower respectively.
According to another aspect of the invention a reflux vacuum cleaner comprises: a vacuum cleaner body having a hose connection; a suction passage and a discharge passage defining an air circulation path in the cleaner body and extending from an inlet to an outlet which are associated with the hose connection; an impeller in the air circulation path for driving air from the inlet to the outlet; a motor for driving the impeller; a motor cooling passage separate from the circulation path; and means associated with the motor for driving cooling air through the motor cooling passage.
The invention will now be described by way of example with reference to the drawings in which:
Figure 1 is a schematic view of a conventional reflux vacuum cleaner; Figure 2 is a schematic view of a reflux vacuum cleaner in accordance with the present invention; and Figure 3 is a schematic sectional view showing a driving motor cooling portion of the cleaner of Figure 2.
Referring to Figures 2 and 3, a reflux vacuum cleaner in accordance with the present invention includes a body 100 having a suction passage 101 and a discharge passage 102, a dust collecting chamber 102 located in the suction passage 101, an impeller 130 rotated by a motor 140, a connecting pipe 160 connected to the body 100 and having a suction pipeline 161 and a discharge pipeline 162 respectively interconnected with the suction and discharge passages 101 and 102, a brush 150 formed at an end of the connecting pipe 160, and a cooling portion 200 provided between the suction and discharge passages 101 and 102 to cool the motor 140.
Referring to Figure 3, a cooling portion 200 of the cleaner, includes a cooling chamber 210 formed between the suction and discharge passages 101 and 102 while accommodating the impeller 130 and the motor 140, a cooling blower 230 disposed in the cooling chamber 210 to be rotated by the motor 140, and a grille 250 4 disposed on a vacuum cleaner body 100 in a location corresponding to the cooling blower 230 and having a plurality of holes 251 formed therein Here, the reference numeral 121 refers to a dust collecting bag which collects the foreign substances such as dust or dirt from the sucked air.
The cooling chamber 210 includes a partition 201 which divides the inner spaces of the cooling chamber 210 into first and second spaces 211 and 212 The impeller 130 and the motor 140 are supported on a partition 201 in a manner such that the impeller 130 is located in the first space 211, while the motor 140 is located in the second space 212 Further, the cooling blower 230 is located in the second space 212 for rotation by the motor 140, to suck in air immediately outside the vacuum cleaner body 100 through the holes 251 of the grille 250.
Meanwhile, the first and second spaces 211 and 212 are interconnected with the discharge passage 102 by the first and second discharge pipes 213 and 214, respectively Here, since the first discharge pipe 213 passes through the second discharge pipe 214, the air flows from the first and second discharge pipes 213 and 214 join in the discharge passage 102.
It is preferable that the second discharge pipe 214 has a greater diameter than that of the first discharge pipe 213.
During operation of the cleaner described above with reference to Figures 2 and 3, ambient air around the cleaning surface is sucked in through a suction passageway 151 of the brush 150 with a high suction force generated by the rotation of the motor 140 and the impeller 130 After being sucked in, the air passes through the suction pipeline 161 of the connecting pipe 160 and to the dust collecting bag 121, where the foreign substances such as dust or dirt of the air are absorbed and filtered out.
After the foreign substances are filtered out by the dust collecting bag 121, the cleaned air is discharged out of the cleaner via the first space 211 and the first discharge pipe 213 of the cooling chamber 210, discharge passage 102, discharge pipeline 162 of the connecting pipeline 160, and discharge passageway 152 of the brush When the once-discharged air is sucked in again, air is sucked in together with foreign substances near to the brush 150 through the suction passageway 151 of the brush 150, and circulates in the above-mentioned path.
The cooling blower 230 is rotated together with the impeller 130, causing the external air separately from the air drawn in through the suction passage 101 The cooling air is sucked in through the holes 251 of the grille 250 disposed on the vacuum cleaner body 100 After being sucked in, the external air flows into the second space 212 of the cooling chamber 210, cooling down the motor 140 Then the air flows into the first discharge pipe 213 through the second discharge pipe 214, and joins the air discharged from the first discharge pipe 213 The air at the confluence then passes through the discharge passage 102 and the discharge pipeline 162 of the connecting pipe 160, and is discharged through a discharge passageway 152 of the brush 150 The air discharged from the body 100, is sucked in again through the suction passageway 151 of the brush 150 together with the foreign substances, and recirculates in the above-mentioned path.
As described above, the air circulation paths for the cleaning process and the motor cooling process are separately defined Accordingly, exposure of the air drawn in through the brush 150 for the cleaning process to the heated motor 140 during its circulation is largely avoided Also, since the external air is consistently supplied through a separate circulation path to cool down the motor 140 by the cooling blower 230, substantial heating of the motor is largely prevented.
In the above-described way, separate definition of the air circulation paths for the cleaning process and the motor cooling process, i e, by separately circulating the air sucked in through the brush for the cleaning process, and the air sucked in by the cooling blower for the motor cooling process, means that the cleaning performance and efficiency are greatly improved.
As stated above, a preferred embodiment of the present invention is shown and described Although the preferred embodiment of the present invention has been described, it is understood that the present invention is not be limited to this preferred 6 embodiment but various changes and modifications can be made by one skilled in the art within the spirit and scope of the present invention as hereinafter claimed.
7

Claims (1)

1 A reflux vacuum cleaner, comprising:
an impeller built in a vacuum cleaner body for being rotated by a motor; a suction passage and a discharge passage interconnected to the vacuum cleaner body, for defining a circulation path of an air which is sucked in by a rotational force of the impeller; a connecting pipe having a suction pipeline and a discharge pipeline respectively connected to the suction and discharge passages; a suction brush interconnected with the connecting pipe; and cooling means provided between the suction and discharge passages for cooling the motor.
2 The vacuum cleaner as claimed in claim 1, wherein the cooling means comprises:
a cooling chamber having a partition which partitions an inner space thereof into a first space and a second space in a manner such that the impeller is located in the first space and the motor is located in the second space; a cooling blower located in the second space facing the impeller and connected with the motor so as to suck in external air toward the motor and the impeller; a grill disposed on the vacuum cleaner body corresponding to the cooling blower, the grill having a plurality of holes formed therein; and a first discharge pipe and a second discharge pipe located in the first and second spaces, respectively, for discharging the air, which is sucked in by the impeller and the cooling blower.
8 3 The vacuum cleaner as claimed in claim 2, wherein air first passes through the second discharge pipe in a manner such that the air discharged from the first and second discharge pipes join into a confluence.
4 The vacuum cleaner as claimed in either claim 2 or claim 3, wherein the second discharge pipe has a larger diameter than the same of the first discharge pipe.
a reflux vacuum cleaner, comprising:
a vacuum cleaner body having a hose connection; a suction passage and a discharge passage defining an air circulation path in the cleaner body and extending from an inlet to an outlet which are associated with the hose connection; an impeller in the air circulation path for driving air from the inlet to the outlet; a motor for driving the impeller; a motor cooling passage separate from the circulation path; and means associated with the motor for driving cooling air through the motor cooling passage.
6 A vacuum cleaner according to claim 5, wherein the cooling passage has an inlet located to admit ambient cooling air.
7 A vacuum cleaner according to claim 5 or claim 6, wherein the cooling passage has an outlet located so as to vent air from the cooling passage into the circulation path.
8 A vacuum cleaner according to claim 7, wherein the cooling passage outlet is located to vent air from the cooling passage into the discharge passage.
9 A vacuum cleaner according to any of claims 5 to 8, wherein the means for driving cooling air through the motor cooling passage is a fan separate from the impeller.
A vacuum cleaner constructed and arranged substantially as herein described and shown in Figures 2 and 3 of the drawings.
Amendments to the claims have been filed as follows CLA 1 ivi 15 1 A reflux vacuum cleaner, comprising:
a vacuum cleaner body including an impeller; a motor for rotating the impeller; a suction passage and a discharge passage interconnected to the vacuum cleaner body and defining a circulation path for air which is drawn in by the impeller when rotating; a connecting pipe having a suction pipe portion and a discharge pipe portion respectively connected to the suction and discharge passages; a suction brush connected to the connecting pipe; and cooling means in communication with the suction and discharge passages, the cooling means comprising a cooling passage defined separately from the said circulation path and arranged such that air driven through the cooling passage cools the motor.
2 The vacuum cleaner as claimed in claim 1, wherein the cooling means comprises:
a cooling chamber having a partition which partitions an inner space thereof into a first space and a second space in a manner such that the impeller is located in the first space and the motor is located in the second space; a cooling blower located in the second space facing the impeller and connected with the motor so as to draw external air in towards the motor and the impeller; a grille disposed on the vacuum cleaner body corresponding to the cooling blower, the grille having a plurality of holes formed therein; and a first discharge pipe and a second discharge pipe located in the first and second spaces, respectively, for discharging the air drawn in by the impeller and the cooling blower.
7 3 The vacuum cleaner as claimed in claim 2, wherein air first passes through the second discharge pipe in a manner such that the air discharged from the first and second discharge pipes join into a confluence.
4 The vacuum cleaner as claimed in either claim 2 or claim 3, wherein the second discharge pipe has a larger diameter than the same of the first discharge pipe.
A reflux vacuum cleaner, comprising:
a vacuum cleaner body having a hose connection; a suction passage and a discharge passage defining an air circulation path in the cleaner body and extending from an inlet to an outlet which are associated with the hose connection; an impeller in the air circulation path for driving air from the inlet to the outlet; a motor for driving the impeller; a motor cooling passage separate from the circulation path; and means associated with the motor for driving cooling air through the motor cooling passage.
6 A vacuum cleaner according to claim 5, wherein the cooling passage has an inlet located to admit ambient cooling air.
7 A vacuum cleaner according to claim 5 or claim 6, wherein the cooling passage has an outlet located so as to vent air from the cooling passage into the circulation path.
8 A vacuum cleaner according to claim 7, wherein the cooling passage outlet is located to vent air from the cooling passage into the discharge passage.
9 A vacuum cleaner according to any of claims 5 to 8, wherein the means for driving cooling air through the motor cooling passage is a fan separate from the impeller.
8 A vacuum cleaner constructed and arranged substantially as herein described and shown in Figures 2 and 3 of the drawings.
-_ I-
GB0024814A 2000-06-30 2000-10-10 A reflux cleaner Expired - Fee Related GB2363975B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020000037104A KR100357516B1 (en) 2000-06-30 2000-06-30 Reflux cleaner

Publications (3)

Publication Number Publication Date
GB0024814D0 GB0024814D0 (en) 2000-11-22
GB2363975A true GB2363975A (en) 2002-01-16
GB2363975B GB2363975B (en) 2002-07-24

Family

ID=19675360

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0024814A Expired - Fee Related GB2363975B (en) 2000-06-30 2000-10-10 A reflux cleaner

Country Status (9)

Country Link
JP (1) JP2002017620A (en)
KR (1) KR100357516B1 (en)
CN (1) CN1132551C (en)
DE (1) DE10056933B4 (en)
EG (1) EG22657A (en)
FR (1) FR2810871B1 (en)
GB (1) GB2363975B (en)
NL (1) NL1017218C2 (en)
RU (1) RU2181252C1 (en)

Cited By (1)

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GB2377163B (en) * 2001-07-05 2004-12-15 Hoover Ltd Vacuum cleaner

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KR100345230B1 (en) * 2000-07-06 2002-07-25 삼성광주전자 주식회사 Reflux cleaner
JP2002085295A (en) * 2000-09-16 2002-03-26 Masayoshi Furuichi Vacuum cleaner of circulating air current type
JP2007509271A (en) * 2003-10-24 2007-04-12 リン，ジュンハオ Multifunctional backflow type powerful suction blower
US7475449B2 (en) * 2003-12-24 2009-01-13 Daewoo Electronics Corporation Vacuum cleaner
KR100676320B1 (en) * 2005-05-30 2007-01-30 삼성광주전자 주식회사 Apparatus for protecting motor of vaccum cleaner
KR101353311B1 (en) * 2005-12-27 2014-01-24 삼성전자주식회사 Vacuum Cleaner
CN100428882C (en) * 2006-11-02 2008-10-29 国家林业局北京林业机械研究所 Mechanical, negative pressure air flow type mouse trapping method
KR101275272B1 (en) * 2011-07-07 2013-06-17 (주)에이티앤비 A radiate heat device of motor
GB2499213B (en) * 2012-02-08 2016-10-19 Dyson Technology Ltd A cleaner-head for a vacuum cleaner
CN103142184A (en) * 2013-01-29 2013-06-12 龚童贵 Circulating energy-saving dust sucking device
CN105625236A (en) * 2014-11-04 2016-06-01 苏州宝时得电动工具有限公司 Blowing and sucking machine
RU2611309C1 (en) * 2015-11-20 2017-02-21 Владимир Иванович Исаев Vacuum cleaner with closed cleaning cycle and device for engine cooling
CN107080491A (en) * 2017-06-01 2017-08-22 云南电网有限责任公司信息中心 A kind of electrical maintenance handhold dust exhaust apparatus
CN108903795B (en) * 2018-05-23 2024-01-16 添可智能科技有限公司 Cleaning equipment and rolling brush assembly rotation direction control method
KR102093260B1 (en) * 2019-01-14 2020-03-26 주식회사 액시오닉스 Closed pathway cleaner having air nozzle and vacuum intake
JP7492318B2 (en) * 2019-06-05 2024-05-29 東芝ライフスタイル株式会社 Vacuum cleaner
JP7558015B2 (en) * 2020-09-28 2024-09-30 株式会社マキタ Vacuum Blower

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Also Published As

Publication number Publication date
CN1132551C (en) 2003-12-31
RU2181252C1 (en) 2002-04-20
FR2810871A1 (en) 2002-01-04
FR2810871B1 (en) 2005-09-23
KR100357516B1 (en) 2002-10-18
DE10056933A1 (en) 2002-01-24
CN1330912A (en) 2002-01-16
NL1017218C2 (en) 2002-01-11
JP2002017620A (en) 2002-01-22
KR20020005064A (en) 2002-01-17
EG22657A (en) 2003-05-31
GB2363975B (en) 2002-07-24
DE10056933B4 (en) 2006-11-16
GB0024814D0 (en) 2000-11-22

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20061010