EP0594635A1 - Injecteur de liquide - Google Patents

Injecteur de liquide

Info

Publication number
EP0594635A1
EP0594635A1 EP92911514A EP92911514A EP0594635A1 EP 0594635 A1 EP0594635 A1 EP 0594635A1 EP 92911514 A EP92911514 A EP 92911514A EP 92911514 A EP92911514 A EP 92911514A EP 0594635 A1 EP0594635 A1 EP 0594635A1
Authority
EP
European Patent Office
Prior art keywords
liquid
compartment
liquid injector
preservative
jacket
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Withdrawn
Application number
EP92911514A
Other languages
German (de)
English (en)
Inventor
Michael Edward Brown
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.)
Individual
Original Assignee
Individual
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
Priority claimed from GB919112471A external-priority patent/GB9112471D0/en
Priority claimed from GB919114727A external-priority patent/GB9114727D0/en
Priority claimed from GB919122794A external-priority patent/GB9122794D0/en
Priority claimed from GB929201616A external-priority patent/GB9201616D0/en
Application filed by Individual filed Critical Individual
Publication of EP0594635A1 publication Critical patent/EP0594635A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/0235—Stationary devices on or in legs or poles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
    • B27K3/10—Apparatus
    • B27K3/105—Injection apparatus

Definitions

  • This invention relates to a liquid injector and particularly to an injector for impregnating timber with a liquid wood preservative and also to a preservative jacket for timber poles, eg telegraph poles.
  • a liquid injector is disclosed in W090/11172, the injector being gas-loadable and cc «mprising an accumulator for containing a liquid and a propellant gas, a liquid delivery- tube for insertion into a timber to be treated by the liquid and intermediate means between the liquid delivery tube and the accumulator designed to establish a flow path for the liquid from the accumulator to the liquid delivery tube, on final installation of the injector.
  • the prior device is designed to be stored ready for installation, with the liquid under pressure from the propellant gas.
  • the disadvantage of the prior device is that if it is left in store for an extended period in its charged condition it is liable to lose its propellant gas pressure before it is installed.
  • a further object of this invention is to extend the use of such injectors to the treatment of surface rotting. It is to be recognised however, that the invention can also be used with other forms of liquid preservative jackets.
  • a preservative jacket for timber poles has been disclosed in US Patent Specification No 4,731,267.
  • This jacket however is applied as a wet dressing and requires the operative to be exposed to the treatment liquid, which in some cases are, to say the least, unpleasant. Furthermore, such a jacket requires to be replaced when the liquid preservative has been exhausted.
  • the present invention aims to overcome or at least mitigate the disadvantages associated with the above prior devices.
  • a li-quid injector comprising an accumulator having a liquid compartment and a second compartment separated from the liquid compartment by a wall having therein gas-diffusable filter means, the second compartment being intended for loading with two or more gas-generating agents, one of which agents is a liquid contained in a sachet, and the second compartment having a flexible closure which is so designed that, on depression thereof onto the sachet, the sachet is ruptured so that the agents can react together to produce a supply of pressurised propellant gas.
  • a liquid injector comprising an accumulator having a liquid compartment and a second compartment separated from the liquid compartment by a wall having therein " means for opening communication from the second compartment to the liquid compartment upon creation within the second compartment of an overpressure, the second compartment being intended for loading with two or more gas-generating agents, one of which agents is a liquid contained in a sachet, the injector being so designed that on deliberate displacement of the liquid and second compartments relative to the tube, the liquid compartment is put into flow communication with the tube and the sachet is ruptured so that the agents can react together to produce a supply of pressurised propellant gas.
  • a liquid injector comprising an accumulator having a liquid compartment and a second compartment separated from the liquid compartment by a wall having therein means for opening communication from the second compartment to the liquid compartment upon creation within the second compartment of an overpressure, the second compartment being intended for loading with two or more gas-generating agents, one of which agents is a liquid contained in a container having a rupturable closure membrane, the injector being so designed that on deliberate displacement of the liquid and second compartments relative to the tube, the liquid compartment is put into flow communication with the tube and the closure membrane is ruptured so that the agents can react together to produce a supply of pressurised propellant gas.
  • the injector can be stored for an indefinite period and be ready for use when required.
  • a preservative jacket for timber poles comprising an outer or backing layer of impervious flexible material, an inner layer for contact with the surface of the pole, the inner layer being of pervious material, and absorbent material held between the said layers, and wherein a liquid distribution collar is set into the layers to permit liquid to be injected into the absorbent material from a liquid injector applied to the collar.
  • the operative is not exposed to the liquid preservative. Furthermore, the preservative can be replenished without replacing the jacket.
  • Fig. 1 is an exploded axial section of an injector according to one aspect of the present invention
  • Fig la is a cross-sectional view on the line A-A of Fig 1;
  • Fig lb is a cross-sectional view of the tube of Fig la in use;
  • Fig. 2 is an exploded axial section of an injector according to a further aspect of the present invention.
  • Fig. 3 is an axial section of the injector of Fig 2 in an assembled and active condition, the preservative liquid and pressurising agents contents having been omitted.
  • Fig. 4 is an exploded axial section of an injector according to a still further aspect of the present invention.
  • Fig. 5 is an axial section of the injector of Fig 4 in an assembled and active condition, the preservative liquid and pressurising agents contents having been omitted;
  • Fig 6 is a pictorial view of a jacket according to a further aspect of the invention, from the inner side;
  • Fig 7 is a pictorial view of the jacket of Fig 6 from the outer side;
  • Fig 8 is an enlarged view of the jacket of Fig 6 showing a liquid distribution collar in greater detail
  • Fig 9 is a sectional view of a portion of a timber pole showing the jacket of Fig 6 installed with two injectors, the right-hand one serving to treat the core as disclosed in WO90/11172 and the left-hand one cop-operating with the jacket to treat the surface of the pole; and
  • Fig 10 is a pictorial view corresponding to Fig 9 but showing the jacket partially buried and the injectors completely buried.
  • an ' injector comprises an accumulator formed of a first plastics shell 1 and a second plastics shell 2 fused together at their rims 3, eg. by ultrasonic welding.
  • the shell 1 has a re-entrant wall 4 having therein four gas- diffusable filters 5, one disposed centrally and the three others equally spaced apart about the central one.
  • the shell 2 has a re-entrant wall 6 which defines an annular socket 7 with an integral inner wall 8.
  • the wall 8 itself defines a central socket 9.
  • the space within the shells 1 and 2 and between the walls 4 and 6 define a compartment 10 for liquid wood preservative. Between the wall 4 and a closure 11 therefore is a second compartment 12 intended for loading with two or more gas- generating agents.
  • One of these agents is a liquid contained in a sachet 13.
  • the closure 12 has a flexible portion 14 with a sprue or point which can rupture the sachet 13.
  • a plunger 15 is slidably received in a cylindrical socket 16 of the closure 11.
  • a flexible tube 17 has at one end an insert 18 also inserted into an opening in the floor of the socket 9.
  • the insert 18 is covered by a rupturable membrane 19.
  • the tube 17 is formed of thin walled tubing which has a plurality of thickened wall portions 17a as shown in Fig la.
  • a weighted insert 20 is provided at the free end of the tube 17.
  • the insert 20 causes the tube 17 to bend about 90° in the compartment 10 and the thickened wall portions ensure that a passage is maintained through the tube for liquid flow.
  • one of the thickened wall portions is always located at the side of the tube which tends to open the flow passage
  • a liquid delivery tube 21 has a flange 22 on one face of which there is a gasket 28 surrounding a tube 21
  • a skirt 23 extends from the other face of the flange 22 and forms a snug sleeve for the wall 8.
  • the skirt 23 is retainable in the socket 7 by means of a spragging washer 24.
  • Also extending from the flange 22 is a central socket 25 in which there is an insert 26 from which extends a narrow tube 27 directed towards the membrane 19.
  • the injector is loaded as follows:-
  • the gas-generating agents are first put into the compartment 12 and the closure 11 is applied and fixed to the wall 4.
  • the compartment 10 is filled with liquid through the opening in the floor of the socket 9 and then the items 17, 18, 19, and 20 are applied to close the opening. Thereafter, the plunger 15 and the items 21 to 27 are applied lightly. In this condition the injector can be stored for an indefinite period.
  • the injector is installed in a piece of timber the tube 21 is inserted into a pre-bored hole in the timber.
  • FIG. 3 A further embodiment of the injector is shown in Figs 3 and 4.
  • the filters have been removed.
  • One of the gas-generating agents is a liquid contained in the sachet 13 and the other is in the form of solid particles 28.
  • the wall 4 has a nose 29 directed towards the compartment 10.
  • the nose 29 has a central blind bore 30 which itself has a spur 31 covered by an elastic sleeve 32.
  • Behind the nose 29 is a socket 33.
  • the guard 34 has a central spigot 36 inserted in the socket 33.
  • the spigot 36 has an angled bore 37 and communicates with the spaces between the ribbing 35 via spaces between a cruciform ribbing 38 on a bedding surface of the guard 34 from which surface the spigot 36 extends.
  • the plunger 15 has' sprags (not shown) which prevent it from being forced out of the socket 16 once it has been pushed fully home as shown in Fig. 3.
  • the plunger 15 also has an O-ring 15a to seal against gas loss through the portion 11.
  • the wall 6 defines an angular socket 7 with an integral inner wall 8.
  • the wall 8 itself defines a central socket 9.
  • the insert 18 defines a socket 39 which has a closure 40 presenting a rupturable membrane 41 lying in the floor of the socket 9.
  • a ball 42 is loosely housed in the socket 39.
  • the tube 17 has at its free end a weighted insert 20.
  • the tube 17 extends with clearance through a grommet 43 which is fitted about the wall 6 and vented at 44 and presents a part-toroidal surface 45 on which the tube 17 can rest without kinking.
  • the insert 20 adopts the lowest position in the compartment 10 regardless of the attitude of the injector.
  • the tube 21 may be provided with a plug 46 which may be used to rupture a membrane in the bore 47 of the tube 21 and stop up the exit end of the bore 47.
  • the parts of the injector can lie on a shelf for an indefinite period in the unassembled condition shown in Fig 2.
  • the compartment 10 can be loaded with preservative liquid through socket 9 when this is uppermost and before the items 17, 18, 39, 40, 41, 42 and 20 are applied.
  • the liquid reaches the level of the opening in the wall 6, the above mentioned items are applied so as to seal the compartment 10.
  • the sachet 13 and particles 28 are also loaded in the compartment 12 and the closure 11 applied and fused.
  • the plunger 15 may then be lightly inserted into the socket 16 and the skirt 23 may be lightly inserted into the socket 7.
  • the plug 46 When it is desired to use the injector, the plug 46 is either discarded or used as described above and the loosely assembly injector has the tube 21 inserted into a pre-bored hole in the timber to be treated. Then, one or more deliberate blows are applied to the plunger 15 from the rear to that the tube 21 is fully driven into the hole in the timber, the gasket 28 seals either directly or indirectly against the timber, the tube 48 ruptures the membrane 19 and penetrates into the socket 9 so that the free end of the tube 48, which is slotted, forms a throttled passage with the ball 42 in opening flow communication from the compartment 10 to the delivery tube 21. In addition, the sprue or point on the wall portion 14 ruptures the sachet 13 and thus starts the gas generating reaction for pressurising the liquid. It should be noted that during the time the injector remains in place the spragging washer 24 retains the skirt 23 in its fully depressed position. Furthermore, the insert 20 always finds the lowest point in the compartment 10 so as to remain dipped o
  • the container 13 and particles 28 may be contained in a compartment at the same side of the compartment 10 as the delivery tube 21 so that the shell would be uninterrupted on the opposite side from the tube 21.
  • one of the gas-generating agents is a liquid contained in a container 49.
  • the container 49 comprises an annular space 50 defined between radially inner and outer walls 51 and 52.
  • the wall 52 has a ribbed tapering portion to fit and centralise within a correspondingly tapered portion of the wall 4.
  • the space 53 surrounded by the wall 51 is closed by a wall 54 and the spaces 50 and 53 intercommunicate via at least one opening 55 in the wall 51.
  • Extending from the wall 54 on the side thereof remote from the space 53 is a fluted spigot 56.
  • the side of the wall 54 from which extends the spigot 56 is radially ribbed.
  • a flange 57 extends outwardly from the edge of the wall 52 remote from the spigot 56 and a skirt 58 extends from the outer edge of the flange 57 in a direction away from the spigot 56.
  • the skirt 58 serves as a spacer for correct location of the container 49 between the closure 11 and the wall 4.
  • the container 49 has a rupturable closure membrane 59 with a thickened radially outer ring 60 fused to the flange 57. Where the membrane 59 joins the ring 60 there is an annular line of weakness. Centrally of the membrane 59 there is a thickened portion 61 having a shallow socket on the side remote from the spigot 56.
  • the closure 11 has a flexible portion 14 with a thickened central portion 14a which seats in the shallow socket in the portion 61.
  • the tube 17 extends with clearance through a grommet 43, which has longitudinally-extending ribs on the inner side of its outer cylindrical wall 62 and a projection on its end lip 62a.
  • a grommet 43 which has longitudinally-extending ribs on the inner side of its outer cylindrical wall 62 and a projection on its end lip 62a.
  • An insert 63 in the tube 21 seals in a socket 64 by means of an 0-ring 65.
  • the tube 21 may be provided with a plug (not shown) which may be used to rupture a membrane in the bore 47 of the tube 21 and thus open side holes 66 in the tube 21, and stop up the exit end of the bore 47.
  • the parts of the injector can lie on a shelf for an indefinite period in the unassembled condition shown in Fig. 1.
  • the compartment 10 can be loaded with preservative liquid through the socket 9 when this is uppermost and before the items 17, 18, 39, 19, 19a, 22, and 20 are applied.
  • the venting between the interior of the grommet 43 and the compartment 10 prevents air locks.
  • the container 49 and particles 28 are also loaded in the compartment 12 and the closure 11 applied and fused.
  • the plunger 15 may then be lightly inserted into the socket 16 and the skirt 23 may be lightly inserted into the socket 37.
  • the plug (not shown) is either discarded or used.as described above and the loosely assembled injector has the tube 21 inserted into a pre-bored hole in the timber to be treated. Then, one or more deliberate blows are applied to the plunger 15 from the rear to that the tube 21 is fully driven into the hole in the timber, the gasket 28 seals either directly or indirectly against the timber, the tube 48 ruptures the membrane 19 and penetrates into the socket 39 so that the free end of the tube 48, which is slotted, forms a throttled passage with the ball 22 in opening flow communication from the compartment 10 to the delivery tube 21.
  • the nose of the plunger 12 and the thickened portion 14a of the flexible portion 14 of the closure 11 depress the thickened portion 61 of the membrane 59 into the space 53 while the membrane 59 itself ruptures at the thickened ring 60 and is drawn into the space 53.
  • the pressurized gas exits from the compartment 12 between the ribs on the tapering portion of the wall 52 of the container 49, through the flutes in the wall 54 and in the spigot 56, and through the central blind bore 30 and spur 31 passing between the elastic sleeve 32 and the nose 29 into compartment 10.
  • the insert 20 always finds the lowest point in the compartment 10 so as to remain dipped in the liquid as it is dispensed.
  • the container 49 and particles 28 may be contained in a compartment at the same side of the compartment 10 as the delivery tube 21 so that the shell would be uninterrupted on the opposite side from the tube 21, and could be manufactured in one piece without the fused rims 3 by the process of blow moulding. A smaller joint would.be necessary around the front or said same side of the compartment 10 to incorporate the subassembly of working components into an opening of the blow moulded shell.
  • a preservative jacket comprises an outer or backing layer 67 of impervious flexible material, preferably opaque, and an inner layer 68 of pervious material which may for example be a woven fabric or a needle- felt.
  • An absorbent material 69 is held between the layers 67 and 68 and this may be a mat or flakes which dispays a mechanical resistance to damage.
  • Soft wood shavings or spun bonded fibres are particularly suitable.
  • One convenient form of the jacket comprises the impervious backing layers, a sheet of pervious material wider than the backing layer laid thereover, with the excess margins of the sheet extending beyond both edges of the backing layer, a further layer identical with the backing layer laid over the sheet and in register with the backing layer.
  • the absorbent material is laid on the further layer, and the excess margins are folded over and onto the absorbent material. Thereafter, the layers are welded or stitched together at the mutually overlying three edges of the folded-over excess margins of the sheet of pervious material and along the edges of the jacket.
  • a liquid distribution collar 70 which may be formed of a sintered material is set into the layers to permit liquid to be injected into the absorbent material 69.
  • the collar 70 has a central opening 71 for the insertion of a fluid injector, as described later.
  • Leading from the opening 71 in the collar 70 into the absorbent material 69 are radiating holes 72 or other passages.
  • the jacket is shown fitted on a timber pole in Figs 9 and 10.
  • the right-hand injector A is shown screwed directly through the jacket and into a bore 73 in the pole so as to inject liquid preservative into the bore 73 which leads to the pole core, without such liquid entering the absorbent material 69.
  • the left-hand injector B while being screwed into a bore 74 in the pole, is blocked from injecting liquid preservative into the bore 74. Instead, the liquid..is injected, via the holes 72 in the collar 70, into the absorbent material 69.
  • two different treatments can be performed simultaneously on the pole core and pole surface.
  • an organic liquid preservative can be injected into an otherwise inert absorbent material or water can be injected to activate dry crystals or powder already in the absorbent material.
  • the bores 73, 74 comprise portions of a single through-bore in the pole.
  • an extra collar 75 in the jacket may provide access to an oblique, inspection and/or refill bore 76 in the pole leading to the through-bore 73/74.
  • One or more collars 70 may be added either during manufacture of the jacket or alternatively at the pole site by blanking a disc from the jacket, inserting the collar 70 and overlying the disc with a self-adhesive gasket to prevent leakage.
  • the gasket is bonded to the outer layer 67.
  • the gasket can be pre-drilled in order to allow an injector B to be fitted to the pole.
  • a line of weakness may be provided in the gasket allowing the tube 21 of the injector to rupture the gasket upon insertion into the bore 73.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Nozzles (AREA)

Abstract

Injecteur de liquide servant à traiter le bois et comportant un accumulateur possédant un premier compartiment (10) pour un liquide, et un second compartiment (12) séparé du premier par une paroi (4) contenant un dispositif diffuseur de gaz (5; 30), et destiné lors de l'utilisation à recevoir au moins deux agents aptes à former un gaz lorsqu'on les mélange, l'un desdits agents étant contenu dans un récipient doté d'une membrane perçable (13; 59) empêchant le mélange. Le second compartiment possède une fermeture souple (14) pouvant percer ladite membrane lorsqu'on la serre contre le récipient afin de permettre le mélange desdits agents, lesquels réagissent et forment un gaz propulsif qui introduit le liquide soit directement dans le bois soit dans une chemise de protection du bois comportant une couche extérieure (67) en matériau souple et imperméable, une couche inférieure (68) destinée à entrer en contact avec la surface du bois, et constituée d'un matériau perméable, un matériau absorbant (69) étant serré entre lesdites couches, ainsi qu'une bague de distribution de liquide (70) reliée à l'injecteur de liquide (A; B).
EP92911514A 1991-06-11 1992-06-11 Injecteur de liquide Withdrawn EP0594635A1 (fr)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
GB91124719 1991-06-11
GB919112471A GB9112471D0 (en) 1991-06-11 1991-06-11 Preservative jacket for timber poles
GB919114727A GB9114727D0 (en) 1991-07-09 1991-07-09 Liquid injector
GB91147272 1991-07-09
GB919122794A GB9122794D0 (en) 1991-10-26 1991-10-26 Liquid injector
GB91227942 1991-10-26
GB929201616A GB9201616D0 (en) 1992-01-25 1992-01-25 Liquid injector
GB92016161 1992-01-25
PCT/GB1992/001043 WO1992022404A2 (fr) 1991-06-11 1992-06-11 Injecteur de liquide

Publications (1)

Publication Number Publication Date
EP0594635A1 true EP0594635A1 (fr) 1994-05-04

Family

ID=27450691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92911514A Withdrawn EP0594635A1 (fr) 1991-06-11 1992-06-11 Injecteur de liquide

Country Status (3)

Country Link
EP (1) EP0594635A1 (fr)
AU (1) AU1916792A (fr)
WO (1) WO1992022404A2 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1823882A (en) * 1929-03-05 1931-09-22 Bauer William Charles Fire extinguisher
IT500420A (fr) * 1951-09-25
GB767733A (en) * 1954-04-30 1957-02-06 Ashe Lab Ltd "improvements in or relating to containers having compartments for dissimilar materials"
US3998359A (en) * 1975-02-04 1976-12-21 Mcdonnell Douglas Corporation Transpiration cooling system having an expulsion bladder
JPS5357518A (en) * 1976-11-04 1978-05-24 Nobuyuki Sugimura Bladder type accumulators provided with builttin type gas bombs in their gas chambers
EP0465521A1 (fr) * 1989-03-28 1992-01-15 Unicorn Fluid Injectors Limited Injecteur de liquide

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9222404A3 *

Also Published As

Publication number Publication date
AU1916792A (en) 1993-01-12
WO1992022404A2 (fr) 1992-12-23
WO1992022404A3 (fr) 1993-05-27

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