CN1264449A - Synthetic turf game surface - Google Patents

Synthetic turf game surface Download PDF

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Publication number
CN1264449A
CN1264449A CN98807100A CN98807100A CN1264449A CN 1264449 A CN1264449 A CN 1264449A CN 98807100 A CN98807100 A CN 98807100A CN 98807100 A CN98807100 A CN 98807100A CN 1264449 A CN1264449 A CN 1264449A
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China
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ground
artificial turf
mentioned
heelpiece
carpet
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Granted
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CN98807100A
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CN1184381C (en
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阿兰·勒米厄
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Kk Apw
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2752-3273 Quebec Inc
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08Surfaces simulating grass ; Grass-grown sports grounds

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Prostheses (AREA)
  • Dental Preparations (AREA)
  • Materials For Medical Uses (AREA)
  • Woven Fabrics (AREA)
  • Laminated Bodies (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Pens And Brushes (AREA)
  • Level Indicators Using A Float (AREA)
  • Pyrane Compounds (AREA)
  • Tires In General (AREA)
  • Road Repair (AREA)

Abstract

A synthetic turf surface for golf courses, tennis courts and other grass-surfaced game playing fields is formed of a synthetic grass carpet having a flexible base sheet (14) with closely spaced-apart upright, blade-like strands (12) of plastic material forming a dense grass-like surface. The carpet is supported upon a cushioning underpad (18) which is formed of a thick, molded sheet of open cell, expanded bead polypropylene. The resiliently compressible polypropylene underpad combined with the synthetic grass carpet closely simulates the feel of a natural grass covered playing surface.

Description

The artificial turf ground of sports ground
Technical field
The present invention relates to the artificial turf ground of type athletic competition field, improved meadow usefulness.
Background of invention
The artificial turf ground of athletic competition field constitutes with carpet usually, and this carpet has upright knitting wool or strand, and this this strand is fixed on egative film or the end liner spare.If the thin flat fillet that strand is done by suitable plastics constitutes, these fillets can be assembled, and form the wire harness that is fixed in egative film.This egative film is generally made of the woven cloth of suitable plastic optical fibre, scribbles elastic coating or bonding agent on this egative film, so that this strand of grappling.The detailed structure of this matte carpet changes quite greatly.Yet generally speaking, they have structure wind resistance rain or outdoor type.
This carpet is laid on the flat ground of refine usually, and to form the athletic competition field, this stadium is designed to imitate the natural sod sport surface.For some motion, below carpet and on the solid supporting ground, lay elastic pad, to produce shock attenuation result.In addition, in some cases, on the upper surface of carpet egative film, center on strand lay one deck sand or other granular material of one deck.Authorize June 21 nineteen eighty-three in the U.S. Patent No. 4,389,435 of Frederick T.Haas this kind example of structure has been described.Another example is shown in to be authorized in the U.S. Patent No. 4,637,942 of Seymour A.Tomarin on January 20th, 1987.
In addition, disclose the example of the artificial turf that is formed by turf formula carpet in following patent, this turf is laid on the flexible heelpiece: authorized U.S. Patent No.s 3,551,263 such as Carter on December 29th, 1970 and disclose the polyurethane foam plactics heelpiece; The U.S. Patent No. 3,332,828 of authorizing Faria etc. on July 25th, 1967 discloses the PVC bubble and has moulded heelpiece or polyurethane foam plactics heelpiece; The U.S. Patent No. 4,637,942 that on January 20th, 1987 was authorized Seymour A.Tomarin discloses rubber formula heelpiece; U.S. Patent No. 4,882,208 examples of authorizing Hans-Urich Brietschidel on November 21st, 1989 illustrate the polyethylene bubble of micropore sealing and mould heelpiece; The U.S. Patent No. 3,597,297 of authorizing Theodore Buchholz etc. on August 3rd, 1971 discloses the polyurethane heelpiece with hole; The U.S. Patent No. 4,505,960 of authorizing James W.Leffingwell etc. on March 19th, 1985 discloses a kind of absorbing pad, and this pad is with manufacturings such as foamed polyvinyl chloride, polyethylene, polyurethane and polypropylene.
There is patent illustrative earlier as above-mentioned difference, in the past after deliberation heelpiece material and structure, when the carpet coupling of these materials and structure and the suitable artificial blade of formation, sensation, effect and the reaction effect of natural sod athletic competition place face imitated on the athletic competition ground of formation admirably.The lot of materials of using in above-mentioned patent shows, does not also find the ground of this artificial turf now.
The present invention relates to special plastics heelpiece ground a kind of and the carpet coupling that forms artificial turf, native pasture has been imitated on this ground admirably, the natural sod ground of typical golf course is approached especially in this ground on sensation and performance, and is similar to very much the natural sod ground of other athletic competition field.
Summary of the invention
It is considered herein that and to make a kind of special molded heelpiece and coupling of artificial turf carpet of flexible polypropylene, this heelpiece combines with the artificial turf carpet and produces a kind of effect, this effect significantly is similar to the ground on natural meadow match ground, particularly golf course.Therefore it is considered herein that and can utilize the particle polypropylene that has expanded to be molded as a micropore open slab or pad, the polyacrylic density of this particle is about 1.3~2.8 pounds/foot 3Between, and the density of this heelpiece is at 1.5~3 pounds/foot 3Between.The coupling effect of turf carpet and supporting end liner can be strengthened by the free end of handling artificial blade of grass sheet with the method for sandblasting, this processing of sandblasting can make the blade tip division or be broken into shred, these shreds twine and weave in mutually, and form dense pad surface, top on carpet.
The purpose of this invention is to provide a kind of artificial turf with special elastic heelpiece, this heelpiece is made of the open particle polypropylene plastics that has expanded of micropore, and this heelpiece produces a kind of effect of proper imitation natural sod sports ground as the part of turf.
Reading the following describes can obviously find out these and other purpose and advantage of the present invention, and accompanying drawing constitutes the part of this explanation.
Description of drawings
Fig. 1 is a signal partial cross-section end-view, and the knitting wool carpet of artificial turf is shown;
Fig. 2 is the schematic diagram that is similar to Fig. 1, illustrates to be configured in the open usefulness of the flexible micropore carpet on the molded heelpiece of expanded granular polypropylene;
Fig. 3 is the figure that is similar to Fig. 2, and the strand upper part step that sandblasts and handle that forms the carpet blade is shown;
Fig. 4 schematically illustrates artificial turf ground, and this ground has dense pad and one deck sand by division shred shape, and this layer sand is in the operating period deposition that sandblasts on the upper surface at the bottom of the carpet;
Fig. 5 schematically illustrates another selectable treatment step, promptly uses the water flow jet carpet, so that further divide the shred on the strand, adjacent shred is twined or weave in, forms intensive pad surface, and the upper surface of handling pad with rotary brush also is shown;
Fig. 6 schematically illustrates the strand of a U-shaped, and the free upper end of this strand splits into shred with method of blasting process;
The golf sports person that Fig. 7 schematically illustrates golf course uses the part of ball seat.
Fig. 8 is the local schematic cross section of amplifying, and ball seat is shown, and this ball seat can insert in the notch that forms on the artificial turf, and this artificial turf has the pad that forms on its upper surface;
Fig. 9 is the schematic diagram that is similar to Fig. 8, and the ball seat that inserts notch on the turf is shown, the pad surface that this turf does not also form the upper end shred and interweaves.
Describe in detail
Fig. 1 schematically illustrates the knitting wool carpet of a part of artificial turf.This carpet has the very near wire harness in many intervals 11, and this wire harness is made up of thin bar of the flat bending of U-shaped or strand 12, and this strand constitutes the blade of pedaline.This wire harness is fixed on egative film or the end liner spare 14.This egative film by woven cloth or similarly fibrous material constitute, this fibrous material is with the plastics of stable wind resistance rain composition such as polypropylene fibre or nylon fiber for example.This special cloth must be flexible, perhaps can change with its composition.
Schematically illustrate as Fig. 1, this wire harness is embedded in the fiber that forms egative film or passes this fiber.For wire harness and egative film are combined, scribble suitable adhesive linkage 16.This adhesive linkage can form with the adhesive of viscoelastic polyurethane condensation material or other outdoor that is suitable for, and this adhesive still has elasticity or flexibility.
Carpet is placed on the flexible buffering heelpiece 18.This heelpiece is made of quite thick molded panel or pad, and this pad is molded with the open particle polypropylene that has expanded of resilient micropore.The thickness of this pad is in about 1/2~2 inch scope, and its preferred density is about 1.5~3 pounds/foot 3Between.The thickness of this pad depends on that the certain effects of requirement can also change at 1/4 inch in up to 12 inches scope.
Carpet is laid on the elastic buffer heelpiece 18, uses then and sandblast 20 or the similar top of grains of sand shape material processed strand or blade from high pressure nozzle 21 ejection.Thisly sandblast that the upper part of each strand splits into many shred 23 (see figure 6)s in the strand with making.These shreds are past to be extended laterally, thereby twines and weave in, forms intensive pad 24.
Nozzle 21 can the mode with scanning sandblast facing to the upper part of the blade that is formed by strand to and fro from a side to opposite side.The actual pressure that sandblasts can change.Preferably sandblast pressure at 100~120 pounds/inch 2In the scope.This available quartz sand that sandblasts, granularity is between about 16~40 orders, and is relatively good between 20~24 orders, preferably is about 24 orders.Translational speed that sandblasts and the time span that sandblasts are chosen as is enough to make the end parts of strand to split into shred separately.For example the part on blade top about 1/5 is split into shred, and this shred still is connected in blade separately.
The power that sandblasts, the time span that depends on the inswept carpet surface that sandblasts is a speed, not only can divide blade, but also forces the sand of ejection to drop between the strand, and sand is deposited on the surface of carpet egative film.The sand bed 25 of Xing Chenging can remain on the egative film of carpet thus, should be held in place by the intensive shred pad intermeshing or that interweave that forms on the blade upper end by sand herein.
As an example, the height of blade on carpet surface is about 5/8 inch, and this is suitable for for the golf meadow, can make about 20%~30% the length on this height top split into shred.In this example, about 1/16 inch promptly about 0.07 inch wide of strand, about 0.002 inch thick, make its cross section be about rectangle, they bend at double place, form two blades, and assemble the wire harness into about 9~11 strands.Every like this wire harness constitutes 18~22 blades.The part on each blade top about 20% is divided into about four shreds.Therefore each wire harness has that many bottom of these shreds still is connected in blade body to about 70~80 shreds, and then stretch out to transverse direction its upper end, and twines with the shred of adjacent strand.About 0.02 inch wide of this shred is about 0.075~0.125 inch.
After the step that sandblasts, carpet is further handled in spraying water with high pressure of available high-pressure nozzle 28 ejections, and the pressure of this water spray for example is about 100~150 pounds/inch 2The effect that this has been sprayed water and has impacted further makes the shred that has divided separate, but the shred on the same strand is separated, the shred of the shred of a strand and adjacent strand is further twisted, bending and weave in, thereby make the pad that forms by the shred that interweaves more intensive.So just form more intensive and more uniform pad surface.
Brush can also be carried out with for example rotary brush 29 in this pad surface, is for further processing, and this brush is placed on the pad surface, can get the pad surface brush more even.Injection water or can one after the other carry out with the processing of brush brush, or carry out simultaneously, schematically illustrate as Fig. 5.
Meaningfully, the power that sandblasts can absorb by the elastic buffering pad below carpet fully, thereby prevents strand by backfin, or permanent deformation takes place, or by this reality of defeating.Be that strand sandblasts and still can remain on its stand up position after handling and maybe can return its stand up position in the end thereon.This stand up position is partly kept by the sand bed 25 of deposition.Simultaneously, strand and pad 24 make sand bed 25 fix in position.
The sand bed that is full of can fix in position, thereby the carpet that interweaves can roll, and is transported to the place, opens at this place again and is with sand bed to use.Can also be in the place of athletic competition field or at any workshop or the building site processing of sandblasting, in these places, with husky and spray water handle and the brush processing more convenient.Therefore the carpet after handling can no longer roll, and can directly be layered on the sport surface when needing, and sand still remains on its position, is using the place no longer to need other sand to carry out filling.
As mentioned above, concrete knitting wool carpet backing and installation system can change.Yet about 7600 deniers of its fiber number of the artificial turf that the example of the carpet that the golf meadow is used comprises, density is about 42 oz/yd 2, about 5/8 inch of fiber height is added thickness and is 1/2~2 inch heelpiece.
Equally, the example of golf course passage ground carpet comprises about 7600 deniers' of fiber number artificial turf, about 42~55 oz/yd of its density 2, about 8/5~2 inch of fiber height is added at least 1 inch thick heelpiece.
The standard of weaving of another example of artificial turf is: fiber number in 3600~10000 Denier ranges, with 13~22 pins/3 inch, about 34~65 oz/yd of 3/16 spacing (gage) and density 2Material.
Can on market, buy the feed particles polypropylene material and be molded as the heelpiece that requires density.As an example, can be with the polypropylene GRANULES that has expanded of BASF, its trade mark is that NEOPOLENP buys, this trade mark is the registration mark of BASF.This material has 1.3,1.9,28 pounds/foot 3Three kinds of density can be used, and according to the reference that BASF provides, its trade mark is EPERNPP, and model is PP45, PP30 and LBS20.When in suitable flat plate mold, just being molded into the density of required thickness at 1.5~3 pounds/foot during at molded time known to the skilled and these granular materials of molding pressure condition lower mould 3The final heelpiece of scope.The flat plate pad that is molded into has the open structure of micropore.The concrete density of selecting can change according to concrete sports events.The density that for example has been found that the satisfaction that is used as the golf meadow is at about 2.36 pounds/foot 3Scope in.
The concrete grammar handled of being used to sandblast relates to the blaster of buying on the market and sandblasting under condition of high voltage.Pressure is preferably in 100~120 pounds/inch 2Scope in, but pressure can change slightly, for example can be low to moderate about 80 pounds/inch 2Make the inswept to and fro carpet surface of nozzle, the sand drift of ejaculation is just sequentially beaten on the sub-fraction carpet.As if angle with respect to the injection sand drift on carpet plane can change, but preferred angle is about 70~80 °, and this angle can obtain very big effect in the shortest time.Distance between nozzle and the strand can change, and the equipment operator can select optimum distance by the splitting action of visualization injection stream.For example this distance can be in 4~5 inches scope, and this depends on the translational speed of the inswept carpet of nozzle.
Last artificial turf is specially adapted to golf course, for example is applicable to ground, meadow, inlet ground, ball seat ground and passage ground.This turf ground also can be used for tennis court, football field or association football pitch and with other sports ground on meadow.The example of these sports grounds is hockey field, meadow, croquet field, Grass bowling balls field, children's play area and baseball field etc.Very relevantly imitated sensation, effect or the resilience that produces by natural meadow ground motion place with the artificial turf ground that methods described herein are produced.The desired natural meadow of golf course and similar court ground has very relevantly been simulated on the last surface that interweaves.This turf can also be used on the ridge surface, in the garden or the deck, in these places, artificial turf can form heat insulation fluid-tight overburden.
Shown in Fig. 7 and 9, artificial turf can be used in the ball seat position of golf course, promptly is used in the zone of sportsman with the ball seat fulcrum ball, so that bat in this zone.Can be in these zones forming many slits 30 on the egative film of artificial turf carpet and on the heelpiece, so that receive the standard ball seat that inserts with hand.Slit 30 is dimensioned to and can inserts ball seat 31 with connecting airtight.For making things convenient for the sportsman to find concrete slit location, can add color mark 32, for example on artificial turf ground, add suitable ink or paint mark.Fig. 7 illustrates has the artificial turf that shred forms pad, and Fig. 8 illustrates and do not have the turf of surface cushion shape.In both cases, this slit all can receive the ball seat of golf.
The present invention can also further develop in the scope of following claims.Therefore we wish that above-mentioned explanation can only be seen illustration effective embodiment of the present invention as, do not have the strict meaning that limits.

Claims (11)

1. artificial turf ground that is used for golf course ground or other type athletic competition ground, meadow, this ground is made of the artificial turf carpet, this carpet has flexible egative film and is fixed on the strand of the very near upright blade shaped of the spacing of doing with plastics on this egative film, this strand forms the upper surface that exposes of intensive cushion, above-mentioned egative film is configured on the flexible buffering heelpiece, this heelpiece is laid on the firm surface, and improvement comprises:
Above-mentioned heelpiece is made of quite thick plate, molded the forming of elastomeric polypropylenes particle of having expanded that this plate is opened with micropore,
And above-mentioned carpet and its supporting heelpiece has very relevantly been simulated part natural meadow golf course ground for example ground, meadow or ball seat ground or passage ground and the similar sport surface of meadow formula.
2. artificial turf as claimed in claim 1 ground, the polyacrylic density of above-mentioned particle is at about 1.3~2.8 pounds/foot 3Between, the thickness of above-mentioned heelpiece is between 1/4~12 inch.
3. artificial turf as claimed in claim 2 ground, the density of above-mentioned polypropylene material is about 1.3~1.9 pounds/foot 3Between, and thickness is between 1~2 inch, so this ground simulation the natural golf meadow and the ball seat ground of golf course.
4. artificial turf as claimed in claim 2 ground, the density of the above-mentioned polypropylene material on this ground are about 1.9 pounds/foot 3, and its thickness is between 1/2~1 inch, thus the ground in simulation natural meadow tennis court formed.
5. artificial turf as claimed in claim 2 ground, the density of the above-mentioned polypropylene material on this ground are about 1.3 pounds/foot 3, the thickness of above-mentioned heelpiece is between 1~2 inch, thus the ball seat part of the natural golf course of formation simulation.
6. artificial turf as claimed in claim 2 ground, the density of the above-mentioned polypropylene material on this ground are about 1.9 pound/feet 3, and the thickness of heelpiece is between about 1~2 inch, thus the ground, meadow of the natural golf course of simulation formed.
7. artificial turf as claimed in claim 1 ground, above-mentioned heelpiece is molded, uses density about 1.3~2.8 pound/feet 3The polypropylene GRANULES that has expanded molded, its thickness is molded as the open pad of whole micropore between 1/2~2 inch, the density of this pad is at about 1.5~3 pound/feet 3Between.
8. artificial turf as claimed in claim 7 ground, the density of the above-mentioned molded heelpiece on this ground are about 2.36 pound/feet 3Thereby, form the ground of simulating ground such as natural golf course meadow.
9. artificial turf as claimed in claim 1 ground, this ground comprises the upper part of above-mentioned strand, this upper part splits into shred, this shred forms intensive pad and is intertwined mutually, on the upper surface of this egative film, add one deck grains of sand formula material, this layer material is positioned at below the shred that interweaves substantially, and is full of the slit between the strand basically, and above-mentioned sand bed is covered by the shred of above-mentioned winding.
10. artificial turf as claimed in claim 1 ground, this ground comprises the enhancement layer of the adhesive type of being done by the elastomeric material of flexibility, this enhancement layer is coated on the soffit of egative film, be positioned on the upper surface of heelpiece, this enhancement layer with synthetic plastic for example polyurethane plastics form.
11. artificial turf as claimed in claim 1 ground, this ground comprises many isolated short slits that form on carpet, this slit is dimensioned to the standard-sized golf tee that can temporarily receive downward insertion, therefore golf sports person can be inserted in ball seat in the slit of any one selection with hand, this ball seat is used to support golf, so that batting.
CNB988071002A 1997-06-09 1998-06-09 Synthetic turf game surface Expired - Fee Related CN1184381C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,206,295 1997-06-09
CA002206295A CA2206295A1 (en) 1997-06-09 1997-06-09 Synthetic turf, of specific composition, obtained through a sand-blasting process and cushioned with a base layer of polypropylene for shock absorption, and a sand-blasting treatment process for said synthetic turf

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Publication Number Publication Date
CN1264449A true CN1264449A (en) 2000-08-23
CN1184381C CN1184381C (en) 2005-01-12

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CNB988071002A Expired - Fee Related CN1184381C (en) 1997-06-09 1998-06-09 Synthetic turf game surface

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EP (1) EP0988423B1 (en)
JP (1) JP3739055B2 (en)
CN (1) CN1184381C (en)
AT (1) ATE216448T1 (en)
AU (1) AU742420B2 (en)
BR (1) BR9810428A (en)
CA (1) CA2206295A1 (en)
DE (1) DE69804960T2 (en)
DK (1) DK0988423T3 (en)
ES (1) ES2178218T3 (en)
HK (1) HK1030248A1 (en)
ID (1) ID23397A (en)
NO (1) NO316520B1 (en)
NZ (1) NZ502184A (en)
PT (1) PT988423E (en)
RU (1) RU2188888C2 (en)
WO (1) WO1998056993A1 (en)

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CN100406082C (en) * 2004-08-03 2008-07-30 文德利希兄弟两合公司 Golf driving pad
CN101835944B (en) * 2007-10-26 2013-07-17 Smg运动场用机械制造有限公司 Mobile device having a removal device for bulk material on an artificial turf field
CN103628385A (en) * 2003-07-14 2014-03-12 腾凯特塞奥隆公司 Artificial turf filament and artificial turf system
CN103946452A (en) * 2011-10-28 2014-07-23 博纳有限公司 Shockpad for artificial turf systems
CN106661850A (en) * 2015-01-26 2017-05-10 斯格拉斯有限公司 Device for inserting artificial grass strands into the ground
CN106677009A (en) * 2016-08-29 2017-05-17 毕国明 Production equipment and construction method of soil matrix artificial turf
CN111615999A (en) * 2020-04-13 2020-09-04 深圳市朝向草业科技发展有限公司 Planting method for planting natural grass on woven artificial grass and mixed lawn
CN114395955A (en) * 2021-12-14 2022-04-26 北京奔流野外运动服装有限公司 Granulated dry snow and its use in safety protection device of dry snow park

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USD866800S1 (en) 2015-10-26 2019-11-12 Brock Usa, Llc Turf underlayment
US10060082B2 (en) 2016-05-18 2018-08-28 Brock Usa, Llc Base for turf system with vertical support extensions at panel edges
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CN103628385A (en) * 2003-07-14 2014-03-12 腾凯特塞奥隆公司 Artificial turf filament and artificial turf system
CN100406082C (en) * 2004-08-03 2008-07-30 文德利希兄弟两合公司 Golf driving pad
CN101835944B (en) * 2007-10-26 2013-07-17 Smg运动场用机械制造有限公司 Mobile device having a removal device for bulk material on an artificial turf field
CN103946452A (en) * 2011-10-28 2014-07-23 博纳有限公司 Shockpad for artificial turf systems
CN106661850A (en) * 2015-01-26 2017-05-10 斯格拉斯有限公司 Device for inserting artificial grass strands into the ground
CN106661850B (en) * 2015-01-26 2019-02-12 斯格拉斯有限公司 Equipment for being inserted into pedaline beam in ground
CN106677009A (en) * 2016-08-29 2017-05-17 毕国明 Production equipment and construction method of soil matrix artificial turf
CN111615999A (en) * 2020-04-13 2020-09-04 深圳市朝向草业科技发展有限公司 Planting method for planting natural grass on woven artificial grass and mixed lawn
CN114395955A (en) * 2021-12-14 2022-04-26 北京奔流野外运动服装有限公司 Granulated dry snow and its use in safety protection device of dry snow park

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RU2188888C2 (en) 2002-09-10
BR9810428A (en) 2000-09-19
ID23397A (en) 2000-04-20
AU7754898A (en) 1998-12-30
AU742420B2 (en) 2002-01-03
ES2178218T3 (en) 2002-12-16
HK1030248A1 (en) 2001-04-27
EP0988423B1 (en) 2002-04-17
NZ502184A (en) 2001-05-25
CN1184381C (en) 2005-01-12
NO316520B1 (en) 2004-02-02
WO1998056993A1 (en) 1998-12-17
ATE216448T1 (en) 2002-05-15
DK0988423T3 (en) 2002-08-19
PT988423E (en) 2002-09-30
DE69804960D1 (en) 2002-05-23
DE69804960T2 (en) 2002-11-21
NO996026L (en) 2000-02-01
JP2002503299A (en) 2002-01-29
JP3739055B2 (en) 2006-01-25
EP0988423A1 (en) 2000-03-29
NO996026D0 (en) 1999-12-08
CA2206295A1 (en) 1998-12-09

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