GB2026940A - Metal reinforced conveyor belts - Google Patents

Metal reinforced conveyor belts Download PDF

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Publication number
GB2026940A
GB2026940A GB7911932A GB7911932A GB2026940A GB 2026940 A GB2026940 A GB 2026940A GB 7911932 A GB7911932 A GB 7911932A GB 7911932 A GB7911932 A GB 7911932A GB 2026940 A GB2026940 A GB 2026940A
Authority
GB
United Kingdom
Prior art keywords
laminated body
elastomeric material
corrosion agent
rubber
agent comprises
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7911932A
Other versions
GB2026940B (en
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.)
Continental AG
Original Assignee
Continental Gummi Werke AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Gummi Werke AG filed Critical Continental Gummi Werke AG
Publication of GB2026940A publication Critical patent/GB2026940A/en
Application granted granted Critical
Publication of GB2026940B publication Critical patent/GB2026940B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/042—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/30—Belts or like endless load-carriers
    • B65G15/32—Belts or like endless load-carriers made of rubber or plastics
    • B65G15/34—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric
    • B65G15/36—Belts or like endless load-carriers made of rubber or plastics with reinforcing layers, e.g. of fabric the layers incorporating ropes, chains, or rolled steel sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
    • D07B1/141—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising liquid, pasty or powder agents, e.g. lubricants or anti-corrosive oils or greases
    • D07B1/144—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising liquid, pasty or powder agents, e.g. lubricants or anti-corrosive oils or greases for cables or cable components built-up from metal wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
    • D07B1/162—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber enveloping sheathing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
    • F16G1/12—Driving-belts made of rubber with reinforcement bonded by the rubber with metal reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/048—Natural or synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00—Metals, their alloys or their compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2317/00—Animal or vegetable based
    • B32B2317/22—Natural rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2319/00—Synthetic rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2433/00—Closed loop articles
    • B32B2433/02—Conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2433/00—Closed loop articles
    • B32B2433/04—Driving belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/06—Articles and bulk
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2076—Power transmissions

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Belt Conveyors (AREA)
  • Laminated Bodies (AREA)
  • Ropes Or Cables (AREA)
  • Reinforced Plastic Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

There is provided a strip or web-like pliable laminated body made of rubber or rubber-like elastomeric material having metal reinforcing plies, e.g. a conveyor belt reinforced with steel wires, embedded therein and extending substantially longitudinally therethrough, in which the metal reinforcing plies (4) are coated with a flowable anti-corrosion agent (5), said agent comprising a component of an elastomeric material mixture, exemplified anti-corrosion agents being paraffins or chlorinated paraffins, naphtha based mineral oils and organic esters or ethers. <IMAGE>

Description

SPECIFICATION Laminated body, more especially conveyor belt or driving belt The present invention relates to a strip or web-like pliable laminated body made of rubber or rubberlike elastomeric material having metal reinforcing plies, more especially conveyor belts or driving belts reinforced with steel wires, cables, braids or the like, embedded therein and extending substantially longitudinally therethrough.
The protection of the metal reinforcing plies in industrial rubber and plastics material articles against corrosive influences of the outer atmosphere is a problem which, under different provisions and conditions, repeatedly occurs and despite farreaching expenditures in individual cases, does not always find satisfactory solutions. A complete protection in the region of the elastomeric material surrounding the plies is not always generally obtainable in practice. It is difficult to attain a complete, continuous envelopment of the metal reinforcing plies over the whole of their surfaces by adhesion to the elastomeric material. Further, a source of mechanical damage to the cover layers or plates occurs by dynamic stress to the article, whereby penetrating dampness finds cracks, etc. through which to enter into the interior of the article.The corrosion damage created thereby is not, however, localised, but travels along the plies and, depending upon their nature, also continues over long distances, so that without any external effects initially being noticeable, extensive destruction can occur.
Particularly endangered in this respect are conveyor belts with embedded steel wires, cables, braids or strands as reinforcing plies. The plies which as a result of their structure are comprised of a plurality of individual wires of predetermined relative looseness and having a highlyfissurised surface and cavities extending into the core, renders impossible the complete, enclosed envelopment aimed at as ideal with adhesive bonding to the elastomeric material by known techniques. There has been no lack of attempts to obtain a thorough "through bonding" of the rubber or plastics material in the core, for example, by prior impregnation of the steel wires with rubber solution, enveloping individual wires or braids with a plastics mixture, insertion of a plastics component when laying the wires, and others.All the endeavours in this direction have never achieved more than partial success.
It is an object of the present invention to protect the metal reinforcing plies in dynamically stressed rubber and plastics material articles, whilst maintaining their bonding with the material in which they are embedded, effectively against corrosive influences of the outer atmosphere, in first place against the penetration of moisture. Whilst this problem is of special importance to so-called "steel wire" conveyor belts and power transmission belts having steel wires or the like filamentary metal reinforcing plies, the present invention however, is not restricted exclusively thereto, but to a large extent is also applicable to other pliable laminated bodies used industrially.
According to the present invention there is provided a strip or web-like pliable laminated body made of rubber or rubber-like elastomeric material having metal reinforcing plies, more especially a conveyor belt or driving belt reinforced with steel wires, cables or braids, embedded therein and extending substantially longitudinally therethrough, in which the metal reinforcing plies bonded, at least in part regions of their surface, with the surrounding elastomeric material are coated with a flowable anti-corrosion agent comprising a component of an elastomeric material mixture.
Preferably the anti-corrosion agent comprises a component of the elastomeric material mixture used for the laminated body, further preferably a processing aid and/or a plasticiser. Depending upon the type and nature of the embedding material, the anti-corrosion agent may comprise a paraffin or naphtha-based mineral oil, a chloroparaffin or a liquid organic ester or ether compound, or the like.
In any case, the anti-corrosion agent preferably contains marked water-repellent components.
Liquid anti-corrosion agents for the surface treatment of freely suspended, or otherwise used in exposed arrangement, tension cables are known as such. Within the scope of the present problem, the use of such conventional anti-corrosion agents formed from an oil, wax or vaseline base were not considered because a serious impairment of the adhesive bond between the wires and the surrounding material was to be expected therefrom.
The solution provided by the present invention, taken against all practical experiences, concerning the preliminary treatment of the metal reinforcing plies leads to surprisingly favourable results, which showed a substantially reduced susceptibility to corrosion and a simultaneously improved dynamic proficiency of the plies, and which also subject to vigorous bending change stresses, e.g. of a steel wire conveyor belt was consistent during continuous testing.The reasoning behind the successful results obtained is probably due to the combination of individual effects which are important on their own; firstly, the elastomeric material mixture is able in its flow phase to penetrate deeply between the individual wires; secondly, also the finest remaining cavities are filled with a water-repellent agent at the same time as a lubricant which stops the direct metal sliding friction between the wires; and finally the covering endlessly enclosing the steel wires, regardless of their surface shape, provides a reliable protection against moisture penetrating through fissures and other damage points, into the embedding material. The protective effect provided already before the processing of the plies is to be appreciated as an additional advantage.
The invention provides for perfect compatability between the anti-corrosion agent and the composition of the elastomeric material mixtures, so that it also absorbed at the intended bonding points by the mixtures. Its applicability therefore does not require any changes in the conventional mixture structure.
The present invention will be further illustrated, by way of example, with reference to the accompanying drawing, in which the single Figure shows a crosssection through a portion of a steel wire conveyor belt.
The conveyor belt shown is built up in known manner from an upper and a lower cover plate 1 and 2 and a core layer 3 containing steel wires 4 as reinforcing plies extending longitudinally therethrough and mutually spaced relative to each other. Whilst the two cover plates 1 and 2 in consideration of mechanical stresses, are formed from an abrasionresistant, strong rubber mixture, the inner core layer 3 is formed of material which will bond to both the cover plates 1 and 2 and to the embedded steel wires 4.
The steel wires 4 are coated with a flowable anticorrosion agent comprising a naphtha-based oil which, in the drawing, is denoted by the reference numeral 5.

Claims (8)

1. A strip or web-like pliable laminated body made of rubber or rubber-like elastomeric material having metal reinforcing plies, more especially a conveyor belt or driving belt reinforced with steel wires, cables or braids, embedded therein and extending substantially longitudinally therethrough, in which the metal reinforcing plies bonded, at least in part regions of their surface, with the surrounding elastomeric material are coated with a flowable anti-corrosion agent comprising a component of an elastomeric material mixture.
2. A laminated body as claimed in claim 1, in which the anti-corrosion agent comprises a component of the elastomeric material mixture used for the laminated body.
3. A laminated body as claimed in claim 1 or 2 in which the anti-corrosion agent contains waterrepellent components.
4. A laminated body as claimed in claim 1,2 or3, in which the anti-corrosion agent comprises a processing aid and/or a plasticiser of the elastomeric material mixture.
5. A laminated body as claimed in claim 4, in which the anti-corrosion agent comprises a paraffin or naphtha-based mineral oil.
6. A laminated body as claimed in claim 4, in which the anti-corrosion agent comprises a chloroparaffin.
7. A laminated body as claimed in claim 4, in which the anti-corrosion agent comprises a liquid organic ester or ether compound.
8. A laminated body substantially as hereinbefore described, with reference to and as illustrated in the accompanying drawing.
GB7911932A 1978-06-02 1979-04-05 Metal reinforced conveyor belts Expired GB2026940B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782824173 DE2824173A1 (en) 1978-06-02 1978-06-02 LAYERED BODY, ESPECIALLY CONVEYOR BELT OR DRIVE BELT

Publications (2)

Publication Number Publication Date
GB2026940A true GB2026940A (en) 1980-02-13
GB2026940B GB2026940B (en) 1982-09-02

Family

ID=6040829

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7911932A Expired GB2026940B (en) 1978-06-02 1979-04-05 Metal reinforced conveyor belts

Country Status (12)

Country Link
JP (1) JPS54159486A (en)
CA (1) CA1119550A (en)
DD (1) DD144025A5 (en)
DE (1) DE2824173A1 (en)
ES (1) ES249588Y (en)
FR (1) FR2427199A1 (en)
GB (1) GB2026940B (en)
GR (1) GR64524B (en)
IT (1) IT1121062B (en)
PL (1) PL119975B1 (en)
RO (1) RO84927B (en)
ZA (1) ZA792402B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015032528A1 (en) * 2013-09-06 2015-03-12 Contitech Transportbandsysteme Gmbh Conveyor belt having a tensile member comprising cables

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1245246A (en) * 1984-07-27 1988-11-22 John Garin Scara type manipulator apparatus
JPH03216329A (en) * 1990-01-22 1991-09-24 Nippon Steel Chem Co Ltd Fiber reinforced composite belt
JPH0458517U (en) * 1990-09-28 1992-05-20
JP5811240B1 (en) 2014-06-30 2015-11-11 横浜ゴム株式会社 Steel cord and conveyor belt

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL106910C (en) * 1957-12-18
US2992469A (en) * 1959-05-14 1961-07-18 Lindsay Wire Weaving Co Fourdrinier wire cloth
US2948772A (en) * 1960-01-25 1960-08-09 Gen Cable Corp Neoprene compound, self-adhering to lead
DE1470826A1 (en) * 1964-10-09 1969-01-16 Bayer Ag Manufacture of compounds of metals with natural or synthetic elastomers
BE786059A (en) * 1972-05-25 1973-01-10 Yokohama Rubber Co Ltd PROCESS FOR PREVENTING DETERIORATION OF THE ADHESION FORCE OF A STEEL WIRE TO A RUBBER MIXTURE.
US3802906A (en) * 1972-08-07 1974-04-09 Gils G Van Method of improving wire adhesion to rubber
ZA743409B (en) * 1974-03-27 1975-05-28 Carolina Steel & Wire Corp Conveyor belt and method of splicing conveyor belt
US3998992A (en) * 1974-06-26 1976-12-21 Honny Chemicals Co., Ltd. Bonding of rubber to metal
JPS52107081A (en) * 1976-03-04 1977-09-08 Honny Chem Ind Co Ltd Adhesion method of rubber to metals
DE2919276C2 (en) * 1979-05-12 1985-02-21 Continental Gummi-Werke Ag, 3000 Hannover Process for the production of moldings from an elastomeric macromolecular material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015032528A1 (en) * 2013-09-06 2015-03-12 Contitech Transportbandsysteme Gmbh Conveyor belt having a tensile member comprising cables
US9815628B2 (en) 2013-09-06 2017-11-14 Contitech Transportbandsysteme Gmbh Conveyor belt having a tensile member comprising cables
AU2014317383B2 (en) * 2013-09-06 2018-05-24 Contitech Transportbandsysteme Gmbh Conveyor belt having a tensile member comprising cables

Also Published As

Publication number Publication date
GR64524B (en) 1980-04-09
RO84927B (en) 1984-09-30
JPS54159486A (en) 1979-12-17
ZA792402B (en) 1982-10-27
CA1119550A (en) 1982-03-09
IT7923101A0 (en) 1979-05-29
PL215768A1 (en) 1980-02-11
DD144025A5 (en) 1980-09-24
RO84927A (en) 1984-08-17
DE2824173C2 (en) 1987-04-23
ES249588Y (en) 1981-01-01
FR2427199A1 (en) 1979-12-28
DE2824173A1 (en) 1979-12-06
ES249588U (en) 1980-06-16
IT1121062B (en) 1986-03-26
GB2026940B (en) 1982-09-02
PL119975B1 (en) 1982-02-27
JPS6234547B2 (en) 1987-07-28
FR2427199B1 (en) 1984-12-14

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Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19990404