DK172815B1 - Method and aggregate for raising well casing - Google Patents
Method and aggregate for raising well casing Download PDFInfo
- Publication number
- DK172815B1 DK172815B1 DK131794A DK131794A DK172815B1 DK 172815 B1 DK172815 B1 DK 172815B1 DK 131794 A DK131794 A DK 131794A DK 131794 A DK131794 A DK 131794A DK 172815 B1 DK172815 B1 DK 172815B1
- Authority
- DK
- Denmark
- Prior art keywords
- frame
- well
- support
- lifting
- knife
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F19/00—Hoisting, lifting, hauling or pushing, not otherwise provided for
- B66F19/005—Lifting devices for manhole covers
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/09—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges
- E01C23/0906—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges
- E01C23/0926—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges with power-driven tools, e.g. vibrated, percussive cutters
- E01C23/0933—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges with power-driven tools, e.g. vibrated, percussive cutters rotary, e.g. circular-saw joint cutters
- E01C23/094—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating cuts, grooves, recesses or, excluding forming, cracks, e.g. cleaning by sand-blasting or air-jet ; for trimming paving edges with power-driven tools, e.g. vibrated, percussive cutters rotary, e.g. circular-saw joint cutters about vertical or inclined axes, e.g. for core sampling
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
- E02D29/1445—Tools for positioning or removing cover frames
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Road Repair (AREA)
Description
* i DK 172815 B1* in DK 172815 B1
Opfindelsen angår en fremgangsmåde og hjælpeværktøj til anvendelse ved hævning af brøndkarme anbragt i befæstede arealer, især asfalterede arealer, og omfattende et i en brøndkarm nedsænkeligt løftehoved således ind-5 rettet, at det efter nedsænkning i en brønd kan bringes i bæreforbindelse med nedadvendende dele af karmen, hvilket løftehoved er ophængt i et åg, der kan hæves og sænkes ved hjælp af et antal donkrafte såsom hydraulisk drevne cylindre, som er afstøttet på et underlag for-10 trinsvis bestående af en ringformet ramme, til anbringelse på belægningen omkring brøndkarmen.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a method and auxiliary tool for use in raising well casings arranged in fortified areas, especially paved areas, and comprising a lifting head submerged in a well frame so that it can be brought into contact with downwardly extending parts after immersion in a well. the frame, which is raised in a yoke which can be raised and lowered by a plurality of jacks such as hydraulically driven cylinders supported on a substrate preferably consisting of an annular frame for application to the coating around the well frame.
Hjælpeværktøjer af ovennævnte art er kendt fra DE 1 928 375 og DE 1 229 265. Fælles for disse hjælpeværktøjer er at bøndkarmen frirykkes og hæves ved aktivering 15 af donkraftene, under samtidig opbrydning af befæstelsen f.eks. en asfaltbelægning. Det opadrettede træk i trækstængerne forplantes til et nedadrettet tryk på donkraftene, som fordeles på underlaget ved den ringformede ramme. Den indvendige rand af rammen vil således dannes 20 en kant over- og langs hvilken asfalten opbrydes hvorved der dannes en nogenlunde veldefineret kant. Imidlertid har det vist sig, at der opbrydningen ved anvendelse af apparatet sker en underbrydning af asfaltkanten, der foranlediger dannelse af en ikke ønsket udad- og nedad 25 skrånende kant, der efterfølgende må borthugges inden ny asfalt pålægges, hvilket medfører en ekstra arbejdsoperation.Auxiliary tools of the aforementioned kind are known from DE 1 928 375 and DE 1 229 265. Common to these auxiliary tools is that the farmer frame is released and raised by activating 15 of the jack, while simultaneously breaking the fastening e.g. an asphalt pavement. The upward pull of the drawbars is propagated to a downward pressure on the jack which is distributed on the substrate by the annular frame. Thus, the inner rim of the frame will form an edge over and along which the tarmac is broken, thereby forming a fairly well-defined edge. However, it has been found that the breaking up of the asphalt edge using the apparatus causes a breakdown of the asphalt edge, which results in the formation of an undesired outward and downward sloping edge, which must subsequently be cut away before new asphalt is applied, which results in an additional working operation.
Netop ønsket om dannelsen af en veldefineret kant i forbindelse med hævning af brøndkarroe i asfaltbelæg-30 ninger, har ført til udvikling af mere komplekst opbyggede, og dermed tillige dyrere hjælpeværktøjer med skæremidler til skæring af befæstelsen, for anvendelse i forbindelse med hævning af brøndkarne i befæstede are aler.Precisely the desire for the formation of a well-defined edge in connection with the raising of the wellbore in asphalt pavements has led to the development of more complex, and thus more expensive auxiliary tools with cutting means for cutting the fortification, for use in raising the wellbores in fortified veins.
35 I US 4,458,949 angives et hjælpeværktøj til en entreprenørmaskine omfattende et oliemotordrevet DK 172815 B1 2 , roterende cylinderformet skær, hvormed befæstelsen om kring brøndkarmen opskæres med en lodret kant til følge, brøndkarmen frirykkes herefter med løftegrej i form af i kroge der sænkes ned i brøndkarmen og bringes i indgreb 5 med dennes nedadvendende dele.35 In US 4,458,949, an auxiliary tool for a construction machine is disclosed comprising an oil-motor driven DK 172815 B1 2, rotating cylindrical cutter, whereby the fastening around the well frame is cut with a vertical edge, the well frame is then released with a lifting handle in the form of hooks in the bottom of the hook. and engaging 5 with its downward-facing portions.
I DE 3 329 586 angives et egentligt motordrevet fræseværktøj for opfræsning af en asfaltbelægning rundt om en brøndkarm, omfattende en i brøndkarmens åbning fastgjort indretning for centrering af opfræsningen 10 rundt omkring brøndkarmen.DE 3 329 586 discloses an actual motor-driven milling tool for milling an asphalt pavement around a well casing, including a device fixed in the well casing for centering milling 10 around the well casing.
Det er opfindelsens formål at angive et hjælpeværktøj til anvendelse ved hævning af brøndkarme i befæstede arealer, der ikke omfatter anvendelse af komplicerede og dyre skæreværktøjer, men som dog kan frembringe en ren-Ί5 skåret kant.It is the object of the invention to provide an auxiliary tool for use in raising well casings in fortified areas, which does not include the use of complicated and expensive cutting tools, but which can nevertheless produce a clean-cut 5 edge.
Dette formål opnås ved et hjælpeværktøj af den indledningsvist angivne art, som er ejendommeligt ved at undersiden af underlaget har et rundtgående, nedadret-tet, revnedannende skær.This object is achieved by an auxiliary tool of the kind mentioned initially, which is peculiar in that the underside of the substrate has a circumferential, downward, cracking insert.
20 Det er således ved opfindelsen erkendt at man, ved en relativ enkel ændring af et i og for sig kendt og simpelt opbygget hjælpeværktøj, kan udnytte og styre de modsat rettede kræfter der opstår under selve friryk-nlngen af en brøndkarm, til at nedpresse skæret i as-25 faltbelægningen, således at denne gennemskæres samtidigt med opbrydningen, og derved opnå en renskåret kant uden anvendelse af komplicerede roterende skære- eller fræseværktøj er.It is thus recognized by the invention that, by a relatively simple alteration of a utility tool known per se and simply constructed, it is possible to utilize and control the opposite directed forces which arise during the actual freezing of a well casing to depress the cutter. in the asphalt coating so that it is cut at the same time as the break-up, thereby obtaining a clean cut edge without the use of complicated rotary cutting or milling tools.
Skæret kan være således indrettet at det er løsbart 30 fra underlaget, i tilfælde af at skæret ikke skal benyttes .The insert may be arranged so that it is detachable from the substrate in case the insert is not to be used.
Opfindelsen forklares nærmere i det følgende under henvisning til tegningen, hvor fig. 1 viser et ovenbillede af hjælpeværktøjet til 'j 35 hævning af brøndkarme ifølge opfindelsen, :j fig. 2 viser sidebillede af samme, må DK 172815 B1 3 fig. 3 viser et ovenbillede af løftet, og fig. 4 viser undersiden af løftet.The invention will be explained in more detail below with reference to the drawing, in which fig. 1 is a top view of the auxiliary tool for raising the well casing according to the invention; 2 shows a side view of the same, FIG. 3 shows a top view of the lift, and FIG. 4 shows the underside of the lift.
Det på fig. l og 2 viste hjælpeværktøj 2, er primært beregnet til anvendelse sammen med hydraulisk 5 drevet løftemekanismer, såsom læssekraner, eller sammen med løftearme eller lignende på grave- eller læssemaskiner. Hjælpeværktøjet 2 består af et to-delt, i det væsentlige rektangulært formet, løft 4 ophængt i fire kæder 6 der er fastgjort til hver sin arm 8 på et kryds-10 formet åg 10. Armenes ender er hver forbundne med stemplet 12 af en hydraulikcylinder 14, ved en hængselforbindelse 16. Hydraulikcylinderne 14 er forbundne med et underlag bestående af en cirkelformet flange 18 med hængselforbindelserne 20. Flangen 18 har på den ind-15 vendige rand en fastsvejst opadrettet rundtgående kant 22, hvis længde i det væsentligste svarer til hydraulikcylindernes længde når disse er lejret i hængselforbindelserne 20. Flangen 18 er endvidere forsynet med i det mindste tre løfteøjer 24. Det krydsformede åg 10 har 20 i toppen et løfteøje 26.The FIG. 1 and 2, are primarily intended for use with hydraulically driven lifting mechanisms, such as loading cranes, or together with lifting arms or the like on excavators or loaders. The auxiliary tool 2 consists of a two-piece, substantially rectangular shaped, lift 4 suspended in four chains 6 attached to each arm 8 on a cross-10 shaped yoke 10. The ends of the arms are each connected to the piston 12 by a hydraulic cylinder. 14, at a hinge connection 16. The hydraulic cylinders 14 are connected to a support consisting of a circular flange 18 with the hinge connections 20. The flange 18 has on the inner rim a welded upwardly extending circumferential edge 22, the length of which essentially corresponds to the length of the hydraulic cylinders. when these are housed in the hinge joints 20. The flange 18 is further provided with at least three lifting eyes 24. The cross-shaped yoke 10 has at the top a lifting eye 26.
Flangen 18 er forsynet med et rundtgående nedad-rettet skær 42. Fordelen herved er, at de nedad-rettede kræfter der opstår mellem flangens underside og asfaltbelægningen udnyttes til at nedpresse skæret i 25 asfaltbelægningen der herved gennemskæres, således at der ved frirykning af brøndkarmen 52 samtidigt udføres en renskæring af asfaltbelægningen udenfor og rundt om brøndkarmen. Den gennemskårne asfaltbelægning fremstår således med en renskåret kant, imod hvilken ny asfalt-30 belægning kan udlægges efter hævning af brøndkarmen.The flange 18 is provided with a circumferential downwardly directed cutter 42. The advantage of this is that the downward forces which arise between the underside of the flange and the asphalt pavement are utilized to depress the cutter in the asphalt pavement thereby being cut, so that upon friction of the well frame 52 at the same time, a cleansing of the asphalt pavement is performed outside and around the well casing. The cut asphalt paving thus appears with a clean cut edge, against which new asphalt paving can be laid after raising the well frame.
Skæret 42 kan være monteret på en flange 44, der kan fastgøres på undersiden af flangen 18 med bolte, således at det er aftageligt såfremt dette ikke skal benyttes.The cutter 42 may be mounted on a flange 44 which can be secured to the underside of the flange 18 by bolts, so that it is removable if not to be used.
Løftet 4, som vist på fig. 3 og 4, består af to i 35 det væsentlige rektangulære plader 28, 30, hvis bort fra hinanden vendende hjørner 32 er skråt afskårne. På **.The lift 4, as shown in FIG. 3 and 4, consists of two essentially rectangular plates 28, 30, whose angularly facing corners 32 are obliquely cut. On **.
DK 172815 B1 4 i r i undersiden af pladen 28 er fastgjort to parallelle styk ker rundstil 34 der er orienteret på tværs af pladens længderetning og understøtter pladen 28 i hele dennes bredde og er lejret i glidebøsninger 31 på undersiden af 5 pladen 30 og udragende under pladen 30. Pladerne 28, 30 er indbyrdes forbundne på oversiden med en hydraulikcylinder 40, ved hjælp af hvilken pladerne 28, 30 kan forskydes bort og imod hverandre, hvorved løftehovedet 4 nedsænket i en brønd kan bringes i bæreforbindelse med 10 nedadvendende dele 50 af brøndkarmen 52.DK 172815 B1 4 in the underside of the plate 28 is attached two parallel pieces of circular style 34 which are oriented transversely of the longitudinal direction of the plate and support the plate 28 throughout its width and are housed in sliding bushes 31 on the underside of the plate 30 and protruding below the plate 30 The plates 28, 30 are interconnected on the upper side with a hydraulic cylinder 40, by means of which the plates 28, 30 can be displaced away and against each other, whereby the lifting head 4 submerged in a well can be brought into carrier with 10 downwardly extending parts 50 of the well frame 52.
Hjælpeværktøjets virkemåde er, at dette med en mobilkran løftes på plads over en brøndkarm 52, hvis dæksel 54 er fjernet, således at det krydsformede åg 10 ^ er centreret over åbningen 56 i brøndkarmen 52. Herved 15 hænger løftet 4 ned i brøndkarmens indvendige side, ~ således at oversiderne af pladerne 28, 30 er beliggende i et niveau under karmens underkant, eller under nogle på brøndkarmens indvendige side egnede fremspring 50. Hjælpeværktøjets hydraulikslanger forbindes til mobil-20 kranens hydrauliksystem, og hydraulikcylinderen 40 aktiveres derefter så pladernes afskårne hjørner 32 forskydes til en position under karmens underside. Herefter aktiveres hydraulikcylindrene 14, hvorved åget 10 hæves i vertikal retning. Ved denne bevægelse forskydes 25 løftet 4 imod karmens underside, eller imod fremspringene 50, således at dette foretager løft af hele karmen, der herved hæves. Kræfterne hidrørende fra frirykningen af karmen 52, overføres via løftecylindrene 14 og flangen 18 til skæret 42, der således samtidigt ned-30 presses i asfaltbelægningen og gennemskærer denne, hvorved der efterlades en renskåret kant omkring den fri-rykkede brøndkarm 52.The operation of the auxiliary tool is that with a mobile crane it is lifted into place over a well frame 52, whose cover 54 is removed, so that the cross-shaped yoke 10 ^ is centered over the opening 56 in the well frame 52. Hereby, the lift 4 hangs in the inside of the well frame, so that the upper sides of the plates 28, 30 are located at a level below the lower edge of the frame, or under some projections 50 suitable on the inside of the well frame. The hydraulic hoses of the auxiliary tool are connected to the hydraulic system of the mobile crane and the hydraulic cylinder 40 is then activated so that the cut corners 32 of the plates are displaced. to a position below the bottom of the frame. Thereafter, the hydraulic cylinders 14 are activated, thereby raising the yoke 10 in the vertical direction. In this movement, the lift 4 is displaced against the underside of the frame, or against the projections 50, so that it raises the entire frame raised thereby. The forces resulting from the clearance of the frame 52 are transmitted via the lifting cylinders 14 and the flange 18 to the cutter 42, which is thus simultaneously pressed down into the asphalt coating and intersecting it, leaving a clean cut edge around the free-moving well frame 52.
Når brøndkarmen 52 er frigjort, løftes denne sammen med hjælpeværktøjet 2 til side med mobilkranen, hvor-35 efter de efterfølgende arbejder i forbindelse med hævningen af brøndkarmen foretages. Hjælpeværktøjet 2 kan * m !3! DK 172815 B1 5 tillige anvendes ved replacering af brøndkarmen 52 ved at hjælpeværktøjet 2 med den i løftet placerede brønd-karm 52 sænkes på plads ved hjælp af mobilkranen, og løftets plader 28, 30 ved aktivering af hydraulik-5 cylinderen 40 forskydes imod hinanden, hvorefter hjælpeværktøjet 2 løftes ud af brøndkarmen 52.When the well frame 52 is released, it is lifted together with the auxiliary tool 2 to the mobile crane, after which the subsequent work in connection with the raising of the well frame is carried out. The utility 2 can * m! 3! DK 172815 B1 5 is also used in replacing the well frame 52 by lowering the auxiliary tool 2 with the well casing 52 in place by the mobile crane and the lifting plates 28, 30 by activating the hydraulic cylinder 40 are displaced against each other, after which the auxiliary tool 2 is lifted out of the well casing 52.
Hjælpeværktøjet kan endvidere være forsynet med en ikke vist reguleringsenhed, der sikrer at der tilføres lige store mængder hydraulikolie til løftecylindrene 14.Further, the auxiliary tool may be provided with a control unit (not shown) which ensures that equal quantities of hydraulic oil are supplied to the lifting cylinders 14.
10 Herved opnås en ligelig fordeling af trækkræfterne på brøndkarmen, når denne hæves.10 This results in an equal distribution of the tensile forces on the well casing when raised.
I tilfælde af at der ikke er en mobilkran til rådighed kan hjælpeværktøjet være anbragt kørbart på hæve-og sænkbare hjul, eventuelt på en ramme. Hydraulik-15 cylindrerne 14, 40 drives med en manuelt drevet hydrau likpumpe, i lighed med en donkraft. Arbejdet hævning af brøndkarme med hjælpeværktøjet i denne udførelsesform vil selvsagt være mere tidskrævende, end hvis dette er tilsluttet en mobilkrans hydrauliksystem. Fordelen ved 20 denne udførelsesform er imidlertid at den er mindre pladskrævende, og således er anvendelig på lokaliteter, hvor der ikke er plads til en mobilkran.In the event that a mobile crane is not available, the utility tool may be mounted drivably on raised and lowerable wheels, possibly on a frame. The hydraulic cylinders 14, 40 are operated with a manually operated hydraulic pump, similar to a jack. The work of raising the well frame with the auxiliary tool in this embodiment will of course be more time consuming than if it is connected to a mobile crane hydraulic system. However, the advantage of this embodiment is that it is less space consuming and thus applicable to locations where there is no space for a mobile crane.
tt
Claims (3)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK131794A DK172815B1 (en) | 1994-11-17 | 1994-11-17 | Method and aggregate for raising well casing |
| DE1995142771 DE19542771A1 (en) | 1994-11-17 | 1995-11-16 | Method for releasing and lifting manhole frames from asphalted surfaces |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK131794A DK172815B1 (en) | 1994-11-17 | 1994-11-17 | Method and aggregate for raising well casing |
| DK131794 | 1994-11-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DK131794A DK131794A (en) | 1996-05-18 |
| DK172815B1 true DK172815B1 (en) | 1999-08-02 |
Family
ID=8103500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK131794A DK172815B1 (en) | 1994-11-17 | 1994-11-17 | Method and aggregate for raising well casing |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE19542771A1 (en) |
| DK (1) | DK172815B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0851955B1 (en) * | 1995-09-27 | 2000-06-28 | Furnes-Hamjern NCC A/S | Method for raising a fixed frame for manhole covers |
| DE19740489C2 (en) * | 1997-09-15 | 1999-07-15 | J & E Cordes Gmbh | Device for replacing or lifting an or the like in an asphalt surface. recessed frame of a manhole cover |
-
1994
- 1994-11-17 DK DK131794A patent/DK172815B1/en not_active IP Right Cessation
-
1995
- 1995-11-16 DE DE1995142771 patent/DE19542771A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DK131794A (en) | 1996-05-18 |
| DE19542771A1 (en) | 1996-07-04 |
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| Date | Code | Title | Description |
|---|---|---|---|
| B1 | Patent granted (law 1993) | ||
| PBP | Patent lapsed |
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