NO143135B - INSULATED PIPING PIPE AND PROCEDURE FOR PREPARING SUCH A PIPING PIPE - Google Patents
INSULATED PIPING PIPE AND PROCEDURE FOR PREPARING SUCH A PIPING PIPE Download PDFInfo
- Publication number
- NO143135B NO143135B NO753305A NO753305A NO143135B NO 143135 B NO143135 B NO 143135B NO 753305 A NO753305 A NO 753305A NO 753305 A NO753305 A NO 753305A NO 143135 B NO143135 B NO 143135B
- Authority
- NO
- Norway
- Prior art keywords
- insulation layer
- pipe
- tube
- rigid
- layer
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 9
- 238000009413 insulation Methods 0.000 claims description 41
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000011152 fibreglass Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims description 3
- 239000012815 thermoplastic material Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000006260 foam Substances 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
- 239000007924 injection Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 4
- 239000006261 foam material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000013305 flexible fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/121—Rigid pipes of plastics with or without reinforcement with three layers
-
- 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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/18—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using tubular layers or sheathings
-
- 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
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/143—Pre-insulated pipes
-
- 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
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
- F16L59/18—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints
- F16L59/182—Joints with sleeve or 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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Insulation (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
Foreliggende oppfinnelse angår en isolert rørledning og en fremgangsmåte for fremstilling av en slik rørledning. The present invention relates to an insulated pipeline and a method for producing such a pipeline.
Røranlegg for føring av varme og kolde fluider omfatter i alminnlighet et indre, bærende rør for.føring av fluidet, et lag av isolasjonsmaterial omkring den ytre diameter av det bærende rør, og en rørformet ytre kappe eller skall rundt det isolerende lag. Isolasjonen gir et lag med lav varmeledeevne rundt det bærende rør, slik at temperaturen til det fluidium som føres gjennom rørledningen kan holdes stort sett konstant. Den ytre kappe beskytter isolasjon mot absorpsjon. Piping systems for carrying hot and cold fluids generally comprise an inner, carrying pipe for carrying the fluid, a layer of insulating material around the outer diameter of the carrying pipe, and a tubular outer jacket or shell around the insulating layer. The insulation provides a layer with low thermal conductivity around the supporting pipe, so that the temperature of the fluid that is carried through the pipeline can be kept largely constant. The outer sheath protects the insulation from absorption.
I en tidligere kjent fremgangsmåte for fremstilling av en isolert rørledning ekstruderes et ytre skall av polyvinylklorid rundt bærerøret, og et skumlag av isolasjonsmaterial sprøytes inn eller føres inn i det ringformede rom mellom det ekstru-derte skall og bærerøret, i en kontinuerlig prosess. Denne prosess er tidkrevende og nødvendiggjør kostbart utstyr for gjennomførelse av den kontinuerlige prosess. Videre begrenser ekstruderingsprosessen materialvalget i rørledningen, idet det ytre skall må fremstilles.av et termoplastmaterial, som er begrenset på grunn av de temperaturmessige betingelser. In a previously known method for producing an insulated pipeline, an outer shell of polyvinyl chloride is extruded around the carrier pipe, and a foam layer of insulating material is injected or introduced into the annular space between the extruded shell and the carrier pipe, in a continuous process. This process is time-consuming and requires expensive equipment to carry out the continuous process. Furthermore, the extrusion process limits the choice of material in the pipeline, as the outer shell must be made of a thermoplastic material, which is limited due to the temperature conditions.
I en annen tidligere kjent fremgangsmåte for fremstilling av en isolert rørledning dannes isolasjonslaget av fiberplast-masse-material. Det er vanlig praksis å øke tettheten i fiber-glassmassen ved å impregnere glassfibrene med harpiks, hvoretter massen sammentrykkes i en oppvarmet form for herding av harpiksen. Derved fremskaffes et stivt fiberglass-lag med ønsket In another previously known method for producing an insulated pipeline, the insulation layer is formed from fibre-plastic pulp material. It is common practice to increase the density of the fibre-glass mass by impregnating the glass fibers with resin, after which the mass is compressed in a heated mold to harden the resin. Thereby, a rigid fiberglass layer is obtained with the desired
form og høy tetthet. Den økede tetthet er ønskelig p.g.a. shape and high density. The increased density is desirable because
den økede motstand mot varmestrøm for en gitt isolasjons-tykkelse. Det stive fiberglasslag formes vanligvis til halvsylindriske skallblokker som festes til det bærende rør på utsiden av dette. Den ytre kappe blir så anbragt rundt fiberglass-blokkene. Det er vanskelig å forskyve et stivt, rørformet ytre skall på langs av lengderetningen av de stive fiberglass-blokker og samtidig å få isolasjonslaget til full-stendig å fylle det ringformede rom mellom det bærende rør og skallet. Dette problem kan unngås ved å ekstrudere et ytre skall rundt isolasjonslaget, men dette har den ulempe at det er kostbart, tidkrevende og temperaturbegrensende, som anført ovenfor. the increased resistance to heat flow for a given insulation thickness. The rigid fiberglass layer is usually formed into semi-cylindrical shell blocks which are attached to the supporting tube on the outside of this. The outer sheath is then placed around the fiberglass blocks. It is difficult to displace a rigid, tubular outer shell along the longitudinal direction of the rigid fiberglass blocks and at the same time get the insulating layer to completely fill the annular space between the supporting tube and the shell. This problem can be avoided by extruding an outer shell around the insulation layer, but this has the disadvantage of being expensive, time-consuming and temperature-limiting, as stated above.
Foreliggende oppfinnelse byr på en fremgangsmåte for fremstilling av en isolert rørledning hvormed behovet for ekstrudering av et ytre beskyttende skall rundt isolasjonslaget er elliminert. Fremgangsmåten byr også på et forholdsvis tett isolasjonslag uten den kostbare,tidkrevende forming av fiberglass-harpiks og etterfølgende varmeherding. The present invention offers a method for producing an insulated pipeline with which the need for extruding an outer protective shell around the insulation layer is eliminated. The method also offers a relatively dense insulation layer without the expensive, time-consuming shaping of fiberglass resin and subsequent heat curing.
Oppfinnelsen går ut på en isolert rørledning omfattende et stivt ytre rør anordnet konsentrisk rundt og i avstand fra et stivt bærende rør, og det særegne ved denne rørledning består i henhold til oppfinnelsen i at det i mellomrommet mellom bærerøret og det ytre rør er innlagt et delvis komprimert, mykt isolasjonslag som er omsluttet av et fleksibelt, ugjennomtrengelig rør som er innlagt mellom det ytre rør og isolasjonslaget. The invention is based on an insulated pipeline comprising a rigid outer pipe arranged concentrically around and at a distance from a rigid supporting pipe, and the peculiarity of this pipeline, according to the invention, is that in the space between the supporting pipe and the outer pipe a partial compressed, soft insulation layer that is enclosed by a flexible, impermeable pipe that is inserted between the outer pipe and the insulation layer.
Det ytre skall og/eller det indre rør er hensiktsmessig frem-stillet av et stivt, filamentviklet plastrør av herdeplast. Isolasjonslaget kan bestå av fleksible fibermatter eller The outer shell and/or the inner tube is suitably made from a rigid, filament-wound plastic tube made of thermosetting plastic. The insulation layer can consist of flexible fiber mats or
av poret skummaterial. of porous foam material.
Ved fremgangsmåten i henhold til oppfinnelsen for fremstilling av en slik isolert rørledning, består det særegne i henhold til oppfinnelsen i at det rundt det bærende rør anbringes et•lag av isolerende material, at det rundt det isolerende lag anbringes et fleksibelt rør som så settes under indre undertrykk for å bevirke sammentrykking av isolasjonslaget, hvoretter det ytre rør føres inn over det sammentrykkede iso-las jonslag og undertrykket slippes slik at isolasjonen ekspanderer radialt til anlegg mot innsiden av det ytre rør under mellomlegg av det fleksible rør og mot utsiden av det stive bærende rør, idet tykkelsen på isolasjonslaget tilpasses den indre diameter på det ytre rør slik at isolasjonslaget gjenvinner bare delvis sin opprinnelige tykkelse etter at undertrykket er sluppet, hvorved isolasjonslaget forblir delvis sammentrykket i forhold til normaltilstand. In the method according to the invention for producing such an insulated pipeline, the peculiarity according to the invention is that a layer of insulating material is placed around the supporting pipe, that a flexible pipe is placed around the insulating layer which is then placed under internal negative pressure to cause compression of the insulation layer, after which the outer tube is introduced over the compressed insulation layer and the negative pressure is released so that the insulation expands radially to abut against the inside of the outer tube under the intermediate layer of the flexible tube and towards the outside of the rigid supporting pipe, the thickness of the insulation layer being adapted to the inner diameter of the outer pipe so that the insulation layer only partially regains its original thickness after the negative pressure is released, whereby the insulation layer remains partially compressed in relation to the normal state.
Oppfinnelsen skal nærmere beskrives under henvisning til vedføyde tegning som viser en rørledning i henhold til oppfinnelsen, under og etter fremstillingen. Fig. 1 er et skjematisk lengdesnitt og viser et trinn av fremgangsmåten i henhold til oppfinnelsen for sammentrykking av et isolasjonslag rundt den ytre diameter av et bærende rør. Fig. 2 er et skjematisk lengdesnitt, i utsnitt, og viser et ytre skall anbragt rundt det sammentrykkede isolasjonslag på det bærende rør. Fig. 3 viser skjematisk og i lengdesnitt den ferdige isolerte rørledning i henhold til foreliggende oppfinnelse. The invention shall be described in more detail with reference to the attached drawing showing a pipeline according to the invention, during and after manufacture. Fig. 1 is a schematic longitudinal section and shows a step of the method according to the invention for compressing an insulation layer around the outer diameter of a supporting pipe. Fig. 2 is a schematic longitudinal section, in section, and shows an outer shell placed around the compressed insulation layer on the supporting pipe. Fig. 3 shows schematically and in longitudinal section the finished insulated pipeline according to the present invention.
Som det fremgår av fig. 1 anbringes først et lag 10 av volum- • messig sammentrykkbart isolasjonsmaterial rundt den ytre overflate av et langstrakt bærende rør 12. Det bærende rør As can be seen from fig. 1, a layer 10 of volumetrically compressible insulation material is first placed around the outer surface of an elongated supporting pipe 12. The supporting pipe
12 er fortrinnsvis av den rørtype som vanligvis benyttes for føring av kolde eller varme fluider under trykk. En slik rørledning kan fremstilles av ekstrudert termoplastmaterial som f.eks. polyvinylklorid, selv om det i foreliggende til-felle foretrekkes at rørledningen er et stivt filamentviklet plastrør av herdeplast. Røret er vist med en tappende 14 12 is preferably of the pipe type that is usually used for conveying cold or hot fluids under pressure. Such a pipeline can be made of extruded thermoplastic material such as e.g. polyvinyl chloride, although in the present case it is preferred that the pipeline is a rigid filament-wound plastic pipe made of thermosetting plastic. The pipe is shown with a tapping 14
og en muffende 16 for sammenkobling av flere seksjoner av slike rør 12 for dannelse av et høytrykks rørledningssystem. and a socket end 16 for connecting several sections of such pipes 12 to form a high pressure pipeline system.
Isolasjonslaget 10 omfatter fortinnsvis et lag av volummessig sammentrykkbar fiberglass-isolasjonsmatte som vikles rundt den ytre diameter av det bærende rør 12 og fastholdes på denne, f.eks. ved at det stiftes sammen, holdes sammen ved hjelp av et ikke vist klebebånd eller ved at det limes til den ytre overflate av det bærende rør. Andre typer av isolasjonsmaterial kan også benyttes, f.eks. polyuretanskum, eller andre poreformede, ettergivende skummaterialer, sålenge som isolasjonslaget gir den ønskede lave varmeledningsevne og er volummessig sammentrykkbart. The insulation layer 10 preferably comprises a layer of volumetrically compressible fiberglass insulation mat which is wrapped around the outer diameter of the supporting pipe 12 and fixed to this, e.g. by being stapled together, held together by means of an adhesive tape not shown or by being glued to the outer surface of the supporting tube. Other types of insulation material can also be used, e.g. polyurethane foam, or other porous, resilient foam materials, as long as the insulation layer provides the desired low thermal conductivity and is volume compressible.
Sammenstillingen av bærerøret 12 og isolasjonslaget 10 inne-sluttes i en fleksibel, ugjennomtrengelig slange 18, eller i en annen fleksibel bane eller film som er i stand til å inneslutte bærerøret og isolasjonslaget slik at sammenstillingen kan settes under vakuum. I den foretrukne utførelse er slangen 18 dannet som en fleksibel polyetylen-pose hvor minst en ende er forbundet med en vakuumpumpe 20. Selv om tegningene viser at begge endene av posen 18 kan forbindes med hver sin vakuumpumpe, er det for tiden foretrukket å trekke vakuumet fra bare den ene ende av posen mens den andre ende av posen er lukket, f.eks. ved tilknytting eller forsegling på annen måte, slik at det dannes en lufttett omhylling av bærerøret og isolasjonslaget. The assembly of the carrier pipe 12 and the insulation layer 10 is enclosed in a flexible, impermeable hose 18, or in another flexible web or film capable of enclosing the carrier pipe and the insulation layer so that the assembly can be placed under vacuum. In the preferred embodiment, the hose 18 is formed as a flexible polyethylene bag where at least one end is connected to a vacuum pump 20. Although the drawings show that both ends of the bag 18 can be connected to separate vacuum pumps, it is currently preferred to draw the vacuum from only one end of the bag while the other end of the bag is closed, e.g. by connecting or sealing in another way, so that an airtight envelope is formed of the carrier pipe and the insulation layer.
Som det fremgår av fig. 2 trekker den ene eller begge vakuum-pumpene et delvis vakuum på innsiden av posen 18, slik at atmosfæretrykket på utsiden vil sammentrykke det volummessige sammentrykkbare isolasjonslag. Isolasjonslaget sammentrykkes en tilstrekkelig grad til at et ytre rør eller skall 22 kan forskyves lengdeveis over plastposen og isolasjonslaget. En stor eller sterk vakuumpumpe er ikke påkrevet idet det bare fordres et undertrykk på ca. 125 mm Hg for å fremskaffe den nødvendige sammentrykking. En passende sammentrykking for vanlige kommersielle lengder på rør kan faktisk fremskaffes meget enkelt ved å benytte en sugepumpe fra en vanlig støv-suger. As can be seen from fig. 2, one or both vacuum pumps draw a partial vacuum on the inside of the bag 18, so that the atmospheric pressure on the outside will compress the volume-wise compressible insulation layer. The insulation layer is compressed to a sufficient degree that an outer tube or shell 22 can be displaced lengthwise over the plastic bag and the insulation layer. A large or strong vacuum pump is not required as only a negative pressure of approx. 125 mm Hg to provide the necessary compression. A suitable compression for common commercial lengths of pipe can actually be obtained very easily by using a suction pump from a common vacuum cleaner.
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US51348174A | 1974-10-09 | 1974-10-09 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO753305L NO753305L (en) | 1976-04-12 |
| NO143135B true NO143135B (en) | 1980-09-15 |
| NO143135C NO143135C (en) | 1983-05-24 |
Family
ID=24043467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO753305A NO143135C (en) | 1974-10-09 | 1975-09-30 | INSULATED PIPING PIPE AND PROCEDURE FOR PREPARING SUCH A PIPING PIPE. |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS5164576A (en) |
| BE (1) | BE834358A (en) |
| CA (1) | CA1035294A (en) |
| DE (1) | DE2542431C3 (en) |
| DK (1) | DK139594B (en) |
| FI (1) | FI66070C (en) |
| FR (1) | FR2287641A1 (en) |
| GB (1) | GB1520644A (en) |
| IT (1) | IT1047191B (en) |
| LU (1) | LU73382A1 (en) |
| NL (1) | NL164944C (en) |
| NO (1) | NO143135C (en) |
| SE (1) | SE429157B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5430561A (en) * | 1977-08-10 | 1979-03-07 | Hitachi Ltd | Heat insulating structure against high temperature and high pressure gas |
| NL7903080A (en) * | 1979-04-19 | 1980-10-21 | Wavin Bv | PLASTIC TUBE PART WITH AN INSULATION LAYER. |
| NL8005255A (en) * | 1980-09-19 | 1982-04-16 | Wavin Bv | PLASTIC TUBE PART PROVIDED WITH A PLASTIC FOAM INSULATION LAYER. |
| JPS57173692A (en) * | 1981-04-17 | 1982-10-26 | Isolite Babcock Refractories | Method of applying heat insulator on inner surface of duct |
| DE3521467C3 (en) * | 1985-06-14 | 1994-11-17 | Gruenzweig & Hartmann Montage | Pipe for piping hot gases |
| FI100130B (en) * | 1995-12-12 | 1997-09-30 | Uponor Innovation Ab | Multilayer plastic pipe |
| GB2347984B (en) * | 1999-03-13 | 2003-03-19 | Federal Mogul Technology Ltd | Protector for use in protecting an elongated member |
| DE102005023281A1 (en) * | 2005-05-20 | 2006-11-23 | Rehau Ag + Co | Method for introducing insulation elements |
| EP2095006B1 (en) * | 2006-12-11 | 2014-07-23 | Trelleborg Industrie SAS | Method of constructing a transfer hose |
| ES2403145B1 (en) * | 2011-11-08 | 2014-03-31 | Abn Pipe Systems, S.L.U. | INSULATING PIPING FOR GEOTHERMAL APPLICATIONS. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5313674A (en) * | 1976-07-23 | 1978-02-07 | Sumitomo Naugatuck | Abs resin mouldings superior in antiiheat cycles |
-
1975
- 1975-09-04 CA CA234,891A patent/CA1035294A/en not_active Expired
- 1975-09-05 SE SE7509909A patent/SE429157B/en unknown
- 1975-09-11 NL NL7510726.A patent/NL164944C/en not_active IP Right Cessation
- 1975-09-12 LU LU73382A patent/LU73382A1/xx unknown
- 1975-09-18 IT IT69333/75A patent/IT1047191B/en active
- 1975-09-22 GB GB38738/75A patent/GB1520644A/en not_active Expired
- 1975-09-23 DE DE2542431A patent/DE2542431C3/en not_active Expired
- 1975-09-25 DK DK429775AA patent/DK139594B/en not_active Application Discontinuation
- 1975-09-26 FI FI752690A patent/FI66070C/en not_active IP Right Cessation
- 1975-09-30 NO NO753305A patent/NO143135C/en unknown
- 1975-09-30 FR FR7529903A patent/FR2287641A1/en active Granted
- 1975-10-09 JP JP50122376A patent/JPS5164576A/ja active Pending
- 1975-10-09 BE BE160821A patent/BE834358A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CA1035294A (en) | 1978-07-25 |
| FI752690A (en) | 1976-04-10 |
| NO143135C (en) | 1983-05-24 |
| FI66070B (en) | 1984-04-30 |
| NL164944C (en) | 1981-02-16 |
| DE2542431B2 (en) | 1978-05-03 |
| IT1047191B (en) | 1980-09-10 |
| FR2287641A1 (en) | 1976-05-07 |
| FR2287641B1 (en) | 1980-11-07 |
| BE834358A (en) | 1976-02-02 |
| DK139594B (en) | 1979-03-12 |
| FI66070C (en) | 1984-08-10 |
| SE429157B (en) | 1983-08-15 |
| JPS5164576A (en) | 1976-06-04 |
| LU73382A1 (en) | 1976-04-13 |
| NL7510726A (en) | 1976-04-13 |
| DK429775A (en) | 1976-04-10 |
| NL164944B (en) | 1980-09-15 |
| NO753305L (en) | 1976-04-12 |
| DE2542431C3 (en) | 1978-12-14 |
| SE7509909L (en) | 1976-04-12 |
| DE2542431A1 (en) | 1976-04-15 |
| GB1520644A (en) | 1978-08-09 |
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