GB2113121A - Mesh screen made of plastics material - Google Patents
Mesh screen made of plastics material Download PDFInfo
- Publication number
- GB2113121A GB2113121A GB08301184A GB8301184A GB2113121A GB 2113121 A GB2113121 A GB 2113121A GB 08301184 A GB08301184 A GB 08301184A GB 8301184 A GB8301184 A GB 8301184A GB 2113121 A GB2113121 A GB 2113121A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screening
- screening plate
- mesh screen
- plate
- screen according
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
- B07B1/469—Perforated sheet-like material
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Fencing (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
A mesh screen for screening rock, stone and other materials comprises a screening plate 1 of plastics material having hexagonal screening holes 2. A metallic supporting frame 3 engages with the external periphery of the screening plate 1. The supporting frame 3 comprises a framework of metal plates which extend vertically between the inlet and outlet faces of the screen plates, and which have vertical supporting elements 4 extending inwardly therefrom to engage each between a respective pair of adjacent screening holes 2 along the external periphery of the screening plate 1. The supporting frame also includes inwardly extending horizontal mounting arrangements 5 which are located each between a respective adjacent pair of screening holes 2 along the external periphery of the screening plate 1. Each mounting arrangement includes a removable fastener 8,9 which serves to connect the screening plate 1 to the framework 3 of metal plates, and also to a screen supporting structure 14. <IMAGE>
Description
SPECIFICATION
Mesh screen
This invention relates to a mesh screen which comprises a screening plate of plastics material, and which is intended to screen rock, stone and other materials.
It is well known to provide a screen plate made of plastics material which consists of screen meshes made of square configuration at the level of the inlet face to the screen. Steel supporting plates are pressed into the periphery of the screen plate.
The disadvantages of this known construction are slipping of the material to be screened and reduced efficiency of the screening process, and provision of necessary strength characteristics for the screen plate only in its outer periphery.
It is also known to provide a mesh screen made of plastics material and consisting of a screen plate having round, rectangular or oval meshes at the level of the inlet face to the screen. The screen plate is made only of plastics.
The disadvantages of this second known construction are slipping of the material to be screened and reduction of the efficiency of screening, and inadequate strength characteristics for the screen plate.
A further known construction provides a mesh screen made of plastics material which consists of a screen plate and meshes of specific configurations, such as square at the level of the inlet face of the screen. The connection of the screen plate to the supporting structure is achieved by a fastener of a complex configuration, which is fitted in special holes formed in the screen plate, and such holes terminate by a cylindrical elongation outside the height of the screen plate. When assembled, the screen plate is fitted in such a way that the cylindrical elongations of the connecting holes should match the holes of the screen supporting structure. When connecting components (fasteners) and the connecting holes are fitted together, cylindrical elongations are opened and connect the screen plate to the screen supporting structure.The removal of the connecting components can only be made in the direction in which they are fitted.
The disadvantages of this further known construction are the likelihood of deformation of the plastics material of the plate in the zone of its connection to the supporting structure; the likelihood of deformation and shifting of the screen plates due to the instability of the connecting points; the necessity for sophisticated manufacture of the cylindrical elongations of the connecting holes; and the ability to remove the connecting components (fasteners) only in the direction of their fitting, and the difficulty in removing the connecting components when the upper part of the screen plate has been deformed in that zone.
The present invention has been developed primarily, though not exclusively, with a view to provide a mesh screen with a screening plate of plastics material having improved strength characteristics, a reduction in slipping of the material to be screened thereby improving the efficiency of the screening process, and a connection of the screening plate to the supporting structure in such a way as to enable quick and easy screening plate replacement, as well as simultaneous establishment of substantial stability in the zone of connection of the screening plate to the supporting structure, and elimination of deformations in such zone.
According to one aspect of the invention there is provided a mesh screen comprising a screening plate of plastics material having screening holes extending between opposite faces of the plate to form inlet and outlet faces for materials to be screened, and a metallic supporting frame engaged with the external periphery of the screening plate, in which:
the supporting frame comprises a framework of metal plates which extend in the direction between the inlet and outlet faces of the screening plate and which have supporting elements extending inwardly therefrom to engage each between a respective pair of adjacent screening holes along the external periphery of the screening plate;
and the screening holes each have a hexagonal configuration at least at the level of the inlet face of the screening plate.
According to a further aspect of the invention there is provided a mesh screen comprising a screening plate of plastics material having screen holes extending between opposite faces of the plate to form inlet and outlet faces for material to be screened, and a metallic supporting frame engaged with the external periphery of the screening plate, in which:
the supporting frame comprises a framework of metal plates which extend in the direction between the inlet and outlet faces of the screening plate and which have mounting arrangements extending inwardly therefrom to be located each between a respective adjacent pair of screening holes along the external periphery of the screening plate;
and each mounting arrangement includes a removable fastener which serves to connect the screening plate to the framework of metal plates.
According to an embodiment of the invention, there is substantial reduction in slippage of the screened material and improvement in the efficiency of the screening process; improved strength characteristics of the screening plate and in the zone of the screening holes; establishment of stable connection to the supporting structure thereby eliminating, or minimising the risk of deformation of the plastics material of the screening plate; quick and convenient assembly and disassembly of worn-out screening plates; and ready removal of fasteners used to assemble the screening plate to the supporting structure, regardless of the state of its upper part or of the screening plate in that zone.
One embodiment of mesh screen according to the invention will now be described in detail, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a top plan view of the mesh screen, but being partly in section along part of the outer periphery of the screen;
Figure 2 is a perspective illustration of an outer metal supporting framework in which a screening plate of the mesh screen is mounted;
Figure 3 is a section taken on the lines Ill-Ill in
Figure 1, illustrating the manner by which the screening plate is removably mounted in the framework shown in Figure 2;
Figure 4 is a longitudinal sectional view of a fixed bushing of a removable fastener arrangement; and
Figure 5 is a side view of a fixing element to be received by the bushing shown in Figure 4.
Referring now to the drawings, there will be described a mesh screen which comprises a screening plate of plastics material having screening holes extending between opposite faces of the plate to form inlet and outlet faces for material to be screened, and a metallic supporting frame engaged with the external periphery of the screening plate. The supporting frame comprises a framework of metal plates which extend in the direction between the inlet and outlet faces of the screening plate and which have integral supporting elements which are pressed inwardly therefrom to engage each between a respective pair of adjacent screening holes along the external periphery of the screening plate.The framework of metal plates also includes integral mounting arrangements pressed inwardly therefrom to be located each between a respective adjacent pair of screening holes along the external periphery of the screening plate.
Thus, the mesh screen comprises a screening plate 1 having screening holes 2 which have a hexagonal configuration at least at the inlet face of the screening plate. A metallic supporting frame which engages with the external periphery of the screening plate 1 comprises a framework of metal plates 3 which extend vertically in normal use, and which have integral vertical supporting elements in the form of tabs or lamellae 4 which are pressed inwardly therefrom to be located each between a respective pair of adjacent hexagonal screening holes 2, as shown along the right hand edge of
Figure 1, which is a partial sectional illustration.
The framework of metal plates 3 also include integral mounting arrangements in the form of vertically spaced horizontally extending tabs, plates or lamellae 5 which are pressed inwardly therefrom. The mounting arrangements are also located each between a respective adjacent pair of hexagonal screening holes 2 along the external periphery of the screening plate 1.
As indicated above, the supporting lamellae 4 extend vertically, whereas the mounting or fixing lamellae 5 extend horizontally, and the lamellae are arranged between the peripheral rows of the meshes of the mesh screen. The lamellae 5 have central mounting holes 6, and there is at least one fixing lamella 5 along the height of each supporting steel plate 3.
The meshes or screening holes 2 have hexagonal configuration at the screen surface level i.e. at the inlet face thereof. The lengths of the side walls of the hexagonal configuration of the holes 2, coaxial to the intended direction of travel of material to be screened, are at least equal in length to the remaining sides of the same hexagonal configurations.
Each mounting arrangement for the screening plate 1 formed by the lamellae 5 on the plates of the framework 3 serves to mount a removable fastener which serves to connect the screening plate 1 to the framework. Each removable fastener is designated generally by reference numeral 7, and comprises a fixed resiliently deformable bush 8 which is mounted in mounting hole 6 and has a tapering internal passage 10 formed by an undulating inner wall of the bush 8 formed by successive peaks 1 6 and troughs 17. The fastener 7 also comprises a removable fixing element 9 which has an external configuration matching that of the inner wall of the bush 8 and which is movable under force into or out of the bush 8 in order respectively to secure or to release the screening plate 1.
The construction of the bush 8 is shown in detail in Figure 4, from which it will be noted that the internal passage 10 tapers downwardly, and at least one longitudinal slot 13 is formed in the wall of the bush 8 to facilitate the mounting of the bush 8 in the aligned holes 6 in each pair of lamellae 5. At the lower end of the bush 8, there is a conical gripping extension 12, and at the upper end there is a lateral annular extension 11. The crests 1 6 and troughs 1 7 on the inner wall of the passage 10 are arranged in succession on diametral planes, and the fixing element 9 has similar arrangement of crests 1 8 and troughs 19 on its external surface, to provide a rigid assembly upon force-fitting of the element 9 in the bush 8.
The assembly of screening plate 1 in the framework 3, and also on a supporting structure 14, is shown more clearly in Figure 3, in which the assembly is mounted in connecting holes 1 5 provided in the structure 14.
During operation, material to be screened is fed in a pre-set direction, and this direction should coincide with the longitudinal axis of the hexagonal configuration of the screen mesh holes 2. In this way, each element of the screened material, when rolling along the inlet plane of the screen, comes up against the back wall of the hexagonal configuration of the mesh holes 2. As the latter have an acute angle therebetween, the two sides meet the element at a specified angle.
The reactions from such contact of the material elements with the sides of the hexagonal configurations of the mesh holes 2 obstructs the movements of the material element, whereby they fall downwardly through the mesh holes 2.
The connection of the mesh screen to the supporting structure 14 is carried out as follows:
The screening plate 1 is fitted on the supporting structure 14 by fitting the bushes 8 in the holes 6 of the mounting-arrangement lamellae 5 (such holes also being formed in the screening plate 1) and also through the connecting holes 1 5. Each bush 8 is able to pass freely through the holes 6 in the lamellae 5, because of its interna-l and/or external configuration i.e. tapered inner passage 10 and tapered external surface. The provision of one or more of the longitudinal slots 13 also facilitates the mounting of the bush 8. Further, the construction of the lower conical extension 12 facilitates assembly. The upper extension 11 of each bush 8 is fitted onto the screening plate 1 in such a way as to contact the uppermost lamella 5 in each pair.Thereafter, fixing element or bolt 9 is force-fitted into the inner tapered passage 10 of the bush 8, until the lower part of the bushing 8 is fully opened and its lower extent 12 closely contacts the wall of hole 1 5 of the supporting structure 14.
The fixing bolt 9 is fitted in the tapering passage 10 by the application of impact forces, and the bolt 9 passes downwardly with successive interengagements between the crests 18 and troughs 1 9 of bolt 9 with the crests 16 and troughs 1 7 of the inner wall of passage 10.
When the upper part of the fixing bolt 9 becomes level with the upper inlet face of the screen, the assembly is completed. At this position, the crests 1 6 and troughs 1 7 of the bush 8 match with the respective crests 1 8 and troughs 1 9 of the fixing bolt 9. Also, where the lower end of the bush 8 has been opened, the lower extension 12 contacts with hole 1 5 of the supporting structure 14, and is held firmly in engagement therewith by the presence of the bolt 9 within the bush 8. Furthermore, there is mutual stable retention of the fixing bolt 9 in the bush 8, and also of the bush 8 within the holes 6 and 15.
The release of the screening plate can be achieved in simple manner, by the application of force to the fixing bolt 9 upwards or downwards, depending upon operating conditions.
Claims (14)
1. A mesh screen comprising a screening plate of plastics material having screening holes extending between opposite faces of the plate to form inlet and outlet faces for materials to be screened, and a metallic supporting frame engaged with the external periphery of the screening plate, in which:
the supporting frame comprises a framework of metal plates which extend in the direction between the inlet and outlet faces of the screening plate and which have supporting elements extending inwardly therefrom to engage each between a respective pair of adjacent screening holes along the external periphery of the screening plate;
and the screening holes each have a hexagonal configuration at least at the level of the inlet face of the screening plate.
2. A mesh screen according to claim 1, in which the screening holes have hexagonal cross-sections throughout their extent from the inlet face to the outlet face of the screening plate.
3. A mesh screen according to claim 1 or 2, in which the lengths of the side walls of each hexagonal configuration which are co-axial to the intended direction of travel of materials to be screened are at least equal to the lengths of the remaining sides of the hexagonal configurations.
4. A mesh screen according to any one of the preceding claims, in which the supporting elements comprise integral tabs or lamellae which are pressed inwardly from the metal plates.
5. A mesh screen according to any one of the preceding claims, in which the supporting framework also includes mounting arrangements extending inwardly therefrom to be located each between a respective adjacent pair of screening holes along the external periphery of the screening plate, each mounting arrangement including a removable fastener which serves to connect the screening plate to the framework of metal plates.
6. A mesh screen comprising a screening plate of plastics material having screen holes extending between opposite faces of the plate to form inlet and outlet faces for material to be screened, and a metallic supporting frame engaged with the external periphery of the screening plate, in which:
the supporting frame comprises a framework of metal plates which extend in the direction between the inlet and outlet faces of the screening plate and which have mounting arrangements extending inwardly therefrom to be located each between a respective adjacent pair of screening holes along the external periphery of the screening plate;
and each mounting arrangement includes a removable fastener which serves to connect the screening plate to the framework of metal plates.
7. A mesh screen according to claim 6, in which each fastener serves additionally to connect the screening plate to a screen supporting structure.
8. A mesh screen according to 6 or 7, in which the mounting arrangements each comprise a pair of integral tabs or lamellae which are pressed inwardly from the metal plates.
9. A mesh screen according to any one of claims 6 to 7, in which the supporting framework also includes supporting elements extending inwardly therefrom to engage each between a
respective pair of adjacent screening holes along the external periphery of the screening plate.
10. A mesh screen according to any one of claims 6 to 9, in which the screening holes are
hexagonal in cross section.
11. A mesh screen according to any one of claims 5 to 10, in which each fastener is mounted in a mounting hole in its respective mounting arrangement and comprises a resiliently deformable fixed bush mounted in the mounting
hole and having a tapering internal passage formed by an undulating inner wail of the bush,
and a fixing element having an external
configuration matching that of the inner wall of the bush and movable under force into or out of the passage in the bush in order respectively to secure or to release the screening plate.
12. A mesh screen according to claim 5 or 9, in which the framework of metal plates extends substantially vertically in use of the mesh screen, and the supporting elements also extend substantially vertically and the mounting arrangements extend substantially horizontally.
13. A mesh screen according to any one of the preceding claims, in which the screening plate is made of polyurethane.
14. A mesh screen according to claim 1 and substantially as hereinbefore described with reference to, and as shown in the accompanying drawings.
1 5. A mesh screen according to claim 6 and substantially as hereinbefore described with reference to, and as shown in the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BG5502882A BG36220A1 (en) | 1982-01-18 | 1982-01-18 | Sieve grid |
| BG5721482A BG36221A1 (en) | 1982-06-30 | 1982-06-30 | Sieve grid |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8301184D0 GB8301184D0 (en) | 1983-02-16 |
| GB2113121A true GB2113121A (en) | 1983-08-03 |
| GB2113121B GB2113121B (en) | 1986-02-12 |
Family
ID=25663305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08301184A Expired GB2113121B (en) | 1982-01-18 | 1983-01-17 | Mesh screen made of plastics material |
Country Status (8)
| Country | Link |
|---|---|
| CS (1) | CS247129B1 (en) |
| DD (1) | DD208305A5 (en) |
| DE (1) | DE3301493A1 (en) |
| ES (1) | ES279729Y (en) |
| GB (1) | GB2113121B (en) |
| GR (1) | GR77190B (en) |
| SE (1) | SE8300121L (en) |
| YU (1) | YU8783A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0169698A2 (en) * | 1984-07-21 | 1986-01-29 | Thule United Limited | Improvements in filtering screens |
| EP0236530A1 (en) * | 1986-03-13 | 1987-09-16 | Hein, Lehmann Aktiengesellschaft | Screen bottom |
| US4757664A (en) * | 1985-06-04 | 1988-07-19 | Screenex Wire Weaving Manufacturers (Proprietary) Limited | Wear resistant panel arrangement |
| US4990023A (en) * | 1985-03-21 | 1991-02-05 | Institut Po Technicheska Kibernet Ika I Robotika | Joint for assembling of sieve elements |
| GB2245199A (en) * | 1991-05-22 | 1992-01-02 | Ind Distributors | Sieve |
| US5385242A (en) * | 1993-02-17 | 1995-01-31 | Freissle; Manfred F. A. | Screening arrangement |
| US6601709B2 (en) | 1999-09-03 | 2003-08-05 | Tuboscope I/P, Inc. | Screen support and screens for shale shakers |
| US6662952B2 (en) | 2002-01-16 | 2003-12-16 | Varco I/P, Inc. | Shale shakers and screens for them |
| AU772638B2 (en) * | 2000-07-25 | 2004-05-06 | Schenck Process Australia Pty Ltd | Ore screening panel |
| US6769550B2 (en) | 2002-01-16 | 2004-08-03 | Varco I/P, Inc. | Screen assemblies for shale shakers |
| FR2874334A1 (en) * | 2004-08-20 | 2006-02-24 | Beaudrey Et Cie Societe Anonyme | ROTARY SIEVE FOR WATER TAKING |
| WO2007042000A3 (en) * | 2005-10-11 | 2007-06-07 | Busak & Shamban Deutschland Gm | Versatile seal or sealing arrangement |
| US9451864B2 (en) | 2011-04-29 | 2016-09-27 | Electrolux Home Products Corporation N.V. | Filter |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH652051A5 (en) * | 1981-09-02 | 1985-10-31 | Gerhard Baumann | Inclined screen kit |
| DE3607660A1 (en) * | 1986-03-08 | 1987-09-10 | Schade Maschf Gustav | Perforated plate fastening to a support structure, in particular in the case of screening machines |
| FR2609643B1 (en) * | 1987-01-16 | 1991-01-04 | Beaudrey & Cie | FILTER PANEL WITH PARALLEL CHANNELS AND MECHANICAL SIEVE COMPRISING SUCH FILTER PANELS |
| DE4337374C2 (en) * | 1992-11-09 | 1998-06-10 | Honda Motor Co Ltd | Device for desludging a molten salt |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1540325A (en) * | 1919-05-05 | 1925-06-02 | Harrington And King Perforatin | Perforated sheet |
| FR1210570A (en) * | 1958-12-12 | 1960-03-09 | Screen frame construction | |
| US3980555A (en) * | 1973-08-24 | 1976-09-14 | Screenex Wire Weaving Manufacturers Limited | Replacable screen with frame |
| DE2513101A1 (en) * | 1975-03-25 | 1976-10-14 | Hutter & Schrantz Ag | Sieve type contact plate - made up of interlocking plastic modular elements |
| AT344629B (en) * | 1976-05-21 | 1978-08-10 | Steinhaus Gmbh | SIEBFELD |
| AT345211B (en) * | 1977-02-15 | 1978-09-11 | Hutter & Schrantz Ag | FASTENING A SCREEN BASE |
| DE2754044B1 (en) * | 1977-12-05 | 1979-04-19 | Willi-Klaus Kinker | Industrial sieve bottom for processing bulk goods |
-
1983
- 1983-01-12 SE SE8300121A patent/SE8300121L/en not_active Application Discontinuation
- 1983-01-17 YU YU8783A patent/YU8783A/en unknown
- 1983-01-17 ES ES1983279729U patent/ES279729Y/en not_active Expired
- 1983-01-17 GB GB08301184A patent/GB2113121B/en not_active Expired
- 1983-01-17 GR GR70273A patent/GR77190B/el unknown
- 1983-01-18 DE DE19833301493 patent/DE3301493A1/en active Granted
- 1983-01-18 DD DD24732183A patent/DD208305A5/en not_active IP Right Cessation
- 1983-01-19 CS CS83362A patent/CS247129B1/en unknown
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0169698A2 (en) * | 1984-07-21 | 1986-01-29 | Thule United Limited | Improvements in filtering screens |
| EP0169698A3 (en) * | 1984-07-21 | 1988-05-25 | Thule United Limited | Improvements in filtering screens and methods of production thereof |
| US4990023A (en) * | 1985-03-21 | 1991-02-05 | Institut Po Technicheska Kibernet Ika I Robotika | Joint for assembling of sieve elements |
| US4757664A (en) * | 1985-06-04 | 1988-07-19 | Screenex Wire Weaving Manufacturers (Proprietary) Limited | Wear resistant panel arrangement |
| EP0236530A1 (en) * | 1986-03-13 | 1987-09-16 | Hein, Lehmann Aktiengesellschaft | Screen bottom |
| GB2245199A (en) * | 1991-05-22 | 1992-01-02 | Ind Distributors | Sieve |
| US5385242A (en) * | 1993-02-17 | 1995-01-31 | Freissle; Manfred F. A. | Screening arrangement |
| US6601709B2 (en) | 1999-09-03 | 2003-08-05 | Tuboscope I/P, Inc. | Screen support and screens for shale shakers |
| AU772638B2 (en) * | 2000-07-25 | 2004-05-06 | Schenck Process Australia Pty Ltd | Ore screening panel |
| US6662952B2 (en) | 2002-01-16 | 2003-12-16 | Varco I/P, Inc. | Shale shakers and screens for them |
| US6769550B2 (en) | 2002-01-16 | 2004-08-03 | Varco I/P, Inc. | Screen assemblies for shale shakers |
| FR2874334A1 (en) * | 2004-08-20 | 2006-02-24 | Beaudrey Et Cie Societe Anonyme | ROTARY SIEVE FOR WATER TAKING |
| US7326336B2 (en) | 2004-08-20 | 2008-02-05 | E. Beaudrey Et Cie | Water intake rotary screen |
| WO2007042000A3 (en) * | 2005-10-11 | 2007-06-07 | Busak & Shamban Deutschland Gm | Versatile seal or sealing arrangement |
| US9451864B2 (en) | 2011-04-29 | 2016-09-27 | Electrolux Home Products Corporation N.V. | Filter |
Also Published As
| Publication number | Publication date |
|---|---|
| DD208305A5 (en) | 1984-05-02 |
| ES279729Y (en) | 1985-07-01 |
| ES279729U (en) | 1984-12-01 |
| CS247129B1 (en) | 1986-11-13 |
| SE8300121L (en) | 1983-07-19 |
| DE3301493A1 (en) | 1983-08-11 |
| GB8301184D0 (en) | 1983-02-16 |
| CS36283A1 (en) | 1985-12-16 |
| YU8783A (en) | 1986-08-31 |
| DE3301493C2 (en) | 1989-11-09 |
| GR77190B (en) | 1984-09-11 |
| GB2113121B (en) | 1986-02-12 |
| SE8300121D0 (en) | 1983-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |