SE7910020L - ELECTRIC WELDING SLEEVE OF THERMOPLASTIC MATERIAL - Google Patents
ELECTRIC WELDING SLEEVE OF THERMOPLASTIC MATERIALInfo
- Publication number
- SE7910020L SE7910020L SE7910020A SE7910020A SE7910020L SE 7910020 L SE7910020 L SE 7910020L SE 7910020 A SE7910020 A SE 7910020A SE 7910020 A SE7910020 A SE 7910020A SE 7910020 L SE7910020 L SE 7910020L
- Authority
- SE
- Sweden
- Prior art keywords
- spirals
- winding
- thermoplastic material
- resistance wire
- electric welding
- Prior art date
Links
- 239000012815 thermoplastic material Substances 0.000 title 1
- 238000003466 welding Methods 0.000 title 1
- 238000004804 winding Methods 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 229920001169 thermoplastic Polymers 0.000 abstract 1
- 239000004416 thermosoftening plastic Substances 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
- B29D23/003—Pipe joints, e.g. straight joints
- B29D23/005—Pipe joints, e.g. straight joints provided with electrical wiring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/06—Making preforms having internal stresses, e.g. plastic memory
- B29C61/0608—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
- B29C61/0625—Preforms comprising incorporated or associated heating means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
- B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
- B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
- B29C65/68—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using auxiliary shrinkable elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5229—Joining tubular articles involving the use of a socket
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/63—Internally supporting the article during joining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
- B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
- B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
- B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/82—Forcing wires, nets or the like partially or completely into the surface of an article, e.g. by cutting and pressing
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/02—Welded joints; Adhesive joints
- F16L47/03—Welded joints with an electrical resistance incorporated in the joint
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/52—Joining tubular articles, bars or profiled elements
- B29C66/522—Joining tubular articles
- B29C66/5229—Joining tubular articles involving the use of a socket
- B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
- B29C66/52294—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being heated
Abstract
A body sleeve (4) obtained by widening of a pipe is arranged on a mandrel on which spaced spirals (7) of a resistance wire (6) are wound. By heating the body sleeve (4), it is fixed onto the winding. An electric current circulating in the resistance wire causes the thermoplastic to melt and flow around the spirals for enclosing the latter completely by expansion. Further, the material forms projecting sections (8, 9) next to the winding. Hence, the spirals (7) are protected against accidentals shocks and the recessed end parts (5) of the inner wall which have been deformed inwards during manufacture require no further forming.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH476078A CH630162A5 (en) | 1978-05-02 | 1978-05-02 | ELECTRIC WELDING SLEEVE MADE OF THERMOPLASTIC MATERIAL. |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7910020L true SE7910020L (en) | 1979-12-05 |
SE457556B SE457556B (en) | 1989-01-09 |
Family
ID=4282034
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7910020A SE457556B (en) | 1978-05-02 | 1979-12-05 | PROCEDURE FOR THE PREPARATION OF AN ELECTRIC WELDING MUFF |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0015958B1 (en) |
JP (1) | JPS6340993B2 (en) |
AT (1) | AT360293B (en) |
BE (1) | BE875992A (en) |
CA (1) | CA1118011A (en) |
CH (1) | CH630162A5 (en) |
DE (2) | DE2947583D2 (en) |
GB (1) | GB2036518B (en) |
IT (1) | IT1112585B (en) |
NL (1) | NL7903215A (en) |
SE (1) | SE457556B (en) |
WO (1) | WO1979001018A1 (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH644054A5 (en) * | 1980-03-31 | 1984-07-13 | Fischer Ag Georg | WELDING SLEEVE FOR THERMOPLASTIC MATERIALS, METHOD AND DEVICE FOR THEIR PRODUCTION. |
BR8108749A (en) * | 1980-08-22 | 1982-06-22 | Esdan Pty Ltd | HANDLES FOR ELECTRIC FUSION PIPES |
GB2090558B (en) * | 1981-01-06 | 1984-08-30 | British Gas Corp | Method of manufacture of a heat sealable fitting and fitting made by such method |
FR2503020A1 (en) * | 1981-04-02 | 1982-10-08 | Rech Applic Plastiques Et | Heating coil inserts for fusing thermoplastic pipe socket joints - preformed so that the concealed wire is adjacent to the interface |
FR2516439A1 (en) * | 1981-11-13 | 1983-05-20 | Armosig | Electrically fusible liners for thermoplastic pipework joints - pre-assembled by partial fusion for satisfactory alignment |
DE3204681C2 (en) * | 1982-02-11 | 1986-02-06 | Friedrichsfeld Gmbh, Steinzeug- Und Kunststoffwerke, 6800 Mannheim | Method and device for embedding an electrical heating wire in a sleeve-like plastic part |
CH657907A5 (en) * | 1982-06-23 | 1986-09-30 | Von Roll Ag | SLEEVE MADE OF THERMOPLASTIC MATERIAL FOR CONNECTING PIPE ELEMENTS. |
DE3272031D1 (en) * | 1982-10-05 | 1986-08-21 | Rech Et D Applic Des Plastique | Electrical plastic welding sleeve and method for its manufacture |
US4626308A (en) * | 1983-02-18 | 1986-12-02 | The Victaulic Company Plc | Method of making welded pipe joints |
GB8719430D0 (en) * | 1987-08-17 | 1987-09-23 | Glynwed Tubes & Fittings | Manufacturing electrofusion coupler |
GB8910070D0 (en) * | 1989-05-03 | 1989-06-21 | Fusion Plastics Ltd | Electro-fusion fittings |
JP2736805B2 (en) * | 1989-05-19 | 1998-04-02 | 日本鋼管継手株式会社 | Synthetic resin pipe fittings |
JPH03793U (en) * | 1989-05-26 | 1991-01-08 | ||
GB2235740B (en) * | 1989-08-22 | 1992-12-23 | British Gas Plc | Grouted pipe joint for polyolefin-lined pipes |
FI87318C (en) * | 1991-06-14 | 1992-12-28 | Kwh Pipe Ab Oy | FOERFARANDE FOER SKARVNING AV SPIRALLINDADE TERMOPLASTROER |
JPH0715602A (en) * | 1993-06-15 | 1995-01-17 | Toshiba Corp | Image data processor |
GB2299047A (en) * | 1995-03-21 | 1996-09-25 | Uponor Ltd | Manufacture of electrofusion fittings |
DE19628916A1 (en) * | 1995-10-12 | 1997-04-17 | Fischer Georg Rohrleitung | Sleeve for connecting pipe parts |
FR2748415B1 (en) * | 1996-05-09 | 1998-06-26 | Etex De Rech Tech Soc | CONNECTING ELEMENT FOR AN ASSEMBLY OF THERMOPLASTIC MATERIALS BY WELDING AND METHOD FOR MANUFACTURING SUCH AN ELEMENT |
CN113580588A (en) * | 2021-08-10 | 2021-11-02 | 安徽杰蓝特新材料有限公司 | Processing technology of extrusion type RTP composite pressure pipe fitting |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL236188A (en) * | 1958-02-17 | |||
CH515449A (en) * | 1970-09-08 | 1971-11-15 | Rollmaplast Ag | Electrically weldable plastic pipe socket with protection against accidental contact |
CH544906A (en) * | 1971-11-12 | 1974-01-15 | Gerbert & Cie | Electrically heatable welding socket and process for their manufacture |
DE2710998C2 (en) * | 1976-03-22 | 1984-08-02 | Sturm, Werner, 4614 Hägendorf | Thermoplastic sleeve with an electrical resistance heating wire |
CH622870A5 (en) * | 1977-06-03 | 1981-04-30 | Werner Sturm |
-
1978
- 1978-05-02 CH CH476078A patent/CH630162A5/en not_active IP Right Cessation
-
1979
- 1979-04-24 NL NL7903215A patent/NL7903215A/en not_active Application Discontinuation
- 1979-04-25 CA CA000326278A patent/CA1118011A/en not_active Expired
- 1979-04-27 IT IT22232/79A patent/IT1112585B/en active
- 1979-04-27 AT AT320779A patent/AT360293B/en not_active IP Right Cessation
- 1979-04-30 JP JP54500697A patent/JPS6340993B2/ja not_active Expired
- 1979-04-30 DE DE79CH7900060D patent/DE2947583D2/en not_active Expired
- 1979-04-30 DE DE2947583A patent/DE2947583C1/en not_active Expired
- 1979-04-30 WO PCT/CH1979/000060 patent/WO1979001018A1/en unknown
- 1979-04-30 GB GB7943944A patent/GB2036518B/en not_active Expired
- 1979-05-02 BE BE0/194953A patent/BE875992A/en not_active IP Right Cessation
- 1979-12-04 EP EP79900439A patent/EP0015958B1/en not_active Expired
- 1979-12-05 SE SE7910020A patent/SE457556B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
IT7922232A0 (en) | 1979-04-27 |
JPS55500479A (en) | 1980-07-31 |
BE875992A (en) | 1979-11-05 |
EP0015958B1 (en) | 1983-11-09 |
NL7903215A (en) | 1979-11-06 |
CA1118011A (en) | 1982-02-09 |
GB2036518B (en) | 1982-11-03 |
WO1979001018A1 (en) | 1979-11-29 |
GB2036518A (en) | 1980-06-25 |
AT360293B (en) | 1980-12-29 |
DE2947583D2 (en) | 1980-11-13 |
ATA320779A (en) | 1980-05-15 |
JPS6340993B2 (en) | 1988-08-15 |
IT1112585B (en) | 1986-01-20 |
EP0015958A1 (en) | 1980-10-01 |
SE457556B (en) | 1989-01-09 |
CH630162A5 (en) | 1982-05-28 |
DE2947583C1 (en) | 1987-04-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
Ref document number: 7910020-2 Effective date: 19911209 Format of ref document f/p: F |