CA1217913A - Method of insulating pipe details - Google Patents
Method of insulating pipe detailsInfo
- Publication number
- CA1217913A CA1217913A CA000422087A CA422087A CA1217913A CA 1217913 A CA1217913 A CA 1217913A CA 000422087 A CA000422087 A CA 000422087A CA 422087 A CA422087 A CA 422087A CA 1217913 A CA1217913 A CA 1217913A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- layer
- pipe component
- mould
- mound
- 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.)
- Expired
Links
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
- 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
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/20—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. moulding inserts or for coating articles
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1228—Joining preformed parts by the expanding material
- B29C44/1242—Joining preformed parts by the expanding material the preformed parts being concentric
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1271—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed parts being partially covered
-
- 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
- B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
- B29C70/742—Forming a hollow body around the preformed part
-
- 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
- F16L59/161—Housings for valves, tee pieces, or the like
-
- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
- B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
-
- 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
- B29L2023/225—Insulated
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/24—Pipe joints or couplings
- B29L2031/246—T-joints
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention relates to a method of insulating pipe components, e.g. pipe branches. A
continuous insulating layer is obtained around a pipe branch by enclosing the pipe branch in a mould which sealingly surrounds the branching point and contains a thermoplastic material, whereafter the mould is rotated so that the thermoplastic material forms a continuous layer around the branching point. The enclosed space between this layer and the pipe component is finally filled with an insulating material, for example, a foam plastic.
The present invention relates to a method of insulating pipe components, e.g. pipe branches. A
continuous insulating layer is obtained around a pipe branch by enclosing the pipe branch in a mould which sealingly surrounds the branching point and contains a thermoplastic material, whereafter the mould is rotated so that the thermoplastic material forms a continuous layer around the branching point. The enclosed space between this layer and the pipe component is finally filled with an insulating material, for example, a foam plastic.
Description
~L2~L7~3 The present invention relates to a method of insulating a pipe component, e.g. a pipe branch or bend.
In the accompanying drawings:-Figure l illustrates a previously known insulating method Figure 2 is a side view of a mound to be used in a method embodying the present invention.
Figure 3 is a plan view of the mound.
Figure 4 illustrates an insulated pipe branch manufactured by means of a method embodying the invention.
Figure 5 is a cross-section of the pipe branch along the line V-V in Figure 4.
Figure 6 illustrates the area B in Figure 5 on an enlarged scale, and Figure 7 (which appears on the same sheet as Figure l) illustrates a pipe bend manufactured by means of a method embodying the present invention.
Thermally insulated pipe joints are presently manufactured, for example, in -the manner illustrated I in Figure l. A main pipe l usually made of metal is surrounded at the branching point by a thermal insulation layer 2 comprising usually a rigid outer layer and a softer inner layer of foam plastics. Thereafter a hole is made in the sheath surface of the insulation layer
In the accompanying drawings:-Figure l illustrates a previously known insulating method Figure 2 is a side view of a mound to be used in a method embodying the present invention.
Figure 3 is a plan view of the mound.
Figure 4 illustrates an insulated pipe branch manufactured by means of a method embodying the invention.
Figure 5 is a cross-section of the pipe branch along the line V-V in Figure 4.
Figure 6 illustrates the area B in Figure 5 on an enlarged scale, and Figure 7 (which appears on the same sheet as Figure l) illustrates a pipe bend manufactured by means of a method embodying the present invention.
Thermally insulated pipe joints are presently manufactured, for example, in -the manner illustrated I in Figure l. A main pipe l usually made of metal is surrounded at the branching point by a thermal insulation layer 2 comprising usually a rigid outer layer and a softer inner layer of foam plastics. Thereafter a hole is made in the sheath surface of the insulation layer
2. A branch pipe 3 is inserted through said hole and welded to the edges of an opening in the main pipe l.
Hereafter insulation layer lengths 4, 5 and 6 are pushed onto the branch pipe and joined -to each other and to the insulation layer 2 by means of butt welding, manual welding using a wire or adding a plasticized material to the seams. This entire operation is very time-consuming, and often the seams will not be quite tight due to which moisture may later penetrate into the foam plastic layer.
In addition, the foam plastic is entirely unprotected at the end of the insulation layer wherefore it may be I.
damaged during transport.
The object of the present invention is to provide a method of insulating e.g. pipe branches and pipe bends by means of which the work can be carried out quickly and can be easily automatized and which results in a water-proof product. In the present method the pipe component is enclosed in a mound whose inner surfaces are located at a distance from the outer walls of the pipe component and whose ends are sealed by means of an element which is transverse with respect to the pipe component against the pipe component, a thermoplastic material is fed into the mound which is heated and put in motion so that -the thermoplastic material forms a continuous layer along the inner surfaces of the mound, the mound is removed upon solidification of the continuous thermoplastic layer and the space between said layer and the pipe component is filled with an insulating material. In this way the pipe component, for example, a pipe branch, is provided with an insulation layer consisting of a continuous rigid surface covering also the ends of the layer and of an inner -foam plastic layer. The method can for the main part be carried out in an automatic casting machine, and as a result an insulation is obtained in which water cannot penetrate into the foam plastic, not even during transport of the component, and in which the foam plastic will also not be damaged during the transport.
According to one preferred embodiment of the method according to the invention the sealing elements located at the ends of the mound comprise end gables of the mound provided with a central opening for the pipe component. Because the end gables are made integral with the mound, the space between the mound and the pipe component need not be sealed with any separate means.
According to a second preferred embodiment of the invention the insulating material preferably comprising a liquid foaming material is fed into the space , 7~3 I
between the solidified thermoplastic layer and the pipe component through a hole made in the sheath surface of the layer. Also this step can be easily automatized which Involves additional cost savings.
I-t is oaken desirable, for example, in view of strength requirements to make -the insulating material adhere to the part to be insulated, in other words, in this case to the metal pipe. This can be made possible by cooling the pipe component during the formation of the thermoplastic layer whereby the thermoplastic does not adhere to the metal pipe during heating of the mound.
The cooling can be produced, for example, by feeding a cooling medium into the pipe component.
One preferred embodiment of the method according to the invention will be described in more detail in the following with reference to Figures 2 to 7 of -the accompanying drawings.
The mound 7 shown in the Figures 2 and 3 comprises two symmetrical halves 8 and 9 which are pivotal connected to each other by means of two hinges 10. The mound consists of an elongated cylindrical portion for the main pipe and a bent portion for the branch pipe extending laterally from the first-mentioned portion Both portions have such a configuration that their inner surface is located at a constant distance from the outer surfaces of the main and the branch pipes of the pipe branch. The ends of the mound are provided with gables 11, 12 which, in the closed position of the mound, form a continuous disc-shaped ring around the main and branch pipe. In order to permit the pipes to extend through the gables said gables are provided with recesses 13.
The branch pipe portion is provided with a locking means 14 for locking the mound.
The Figures 4 to 6 illustrate a pipe branch insulated according to an embodiment of the invention and comprising ~L2~7~3 a main pipe 15 and a transverse branch pipe 16 welded to said main pipe. The pipe branch is surrounded by a substantially rigid sistered layer 17 of a thermoplas-tic material. The thermoplastic layer is provided also with end surfaces 18 which extend from -the sheath sun-face to the outer surface of the pipes 15, 16, see Figure 6. The space between the outer surface of the pipes 15, lo and the inner surface of the thermoplas--tic layer is filled with an insulating material 19, preferably comprising foam plastic, which is inserted in this closed space through a hole 20 in the thermos plastic layer.
The pipe branch according to Figures 4 to 6 is insulated according to the invention in the following manner. after the branch pipe 16 has been welded to a lateral opening in the main pipe 15, the pipe branch is positioned in the mound according to Figures 2 and 3 in which a suitable quantity of a preferably particular thermoplastic material is disposed. When -the mound is closed, the pipes are exude in the mound so that they are located along the central longitudinal axes of the mound parts. Hereafter the mound is heated while rota-tying it both around horizontal and vertical axes by means of means (not shown) for such a long time that the thermoplastic material is sistered along -the inner surfaces of the mound. In order to prevent sistering of the material also on the pipe surfaces the pipes are cooled by feeding a cooling medium into them. Hereafter the mound 7 is cooled, and the pipe branch together with the continuous surrounding thermoplastic layer 17 can be removed from the mound. Because material is also sistered on the inside of the gables 11, 12 of the mound, the thermoplastic layer has end surfaces 18 which keep the pipes in position along the center lines of the thermoplastic layer. Hereafter a hole 20 is made in the sheath surface of the thermoplastic layer, and I
I
the closed space between the pipes and the thermoplas-tic layer is filled with a liquid Roaming insulating material 19 through the hole 20 whereaE-ter the insulate Ed pipe branch is ready.
The insulated pipe bend shown in Figure 7 is made in the same way but the mound must of course have the same shape as the pipe bend.
If desired, the cooling of the pipes can be omitted in which case the thermoplastic material is sistered also on the outer surface of the pipes. The gables 11, 12 of the mound can be replaced by sealing plugs which are pressed in between the pipe and the sheath surface of the mound.
Hereafter insulation layer lengths 4, 5 and 6 are pushed onto the branch pipe and joined -to each other and to the insulation layer 2 by means of butt welding, manual welding using a wire or adding a plasticized material to the seams. This entire operation is very time-consuming, and often the seams will not be quite tight due to which moisture may later penetrate into the foam plastic layer.
In addition, the foam plastic is entirely unprotected at the end of the insulation layer wherefore it may be I.
damaged during transport.
The object of the present invention is to provide a method of insulating e.g. pipe branches and pipe bends by means of which the work can be carried out quickly and can be easily automatized and which results in a water-proof product. In the present method the pipe component is enclosed in a mound whose inner surfaces are located at a distance from the outer walls of the pipe component and whose ends are sealed by means of an element which is transverse with respect to the pipe component against the pipe component, a thermoplastic material is fed into the mound which is heated and put in motion so that -the thermoplastic material forms a continuous layer along the inner surfaces of the mound, the mound is removed upon solidification of the continuous thermoplastic layer and the space between said layer and the pipe component is filled with an insulating material. In this way the pipe component, for example, a pipe branch, is provided with an insulation layer consisting of a continuous rigid surface covering also the ends of the layer and of an inner -foam plastic layer. The method can for the main part be carried out in an automatic casting machine, and as a result an insulation is obtained in which water cannot penetrate into the foam plastic, not even during transport of the component, and in which the foam plastic will also not be damaged during the transport.
According to one preferred embodiment of the method according to the invention the sealing elements located at the ends of the mound comprise end gables of the mound provided with a central opening for the pipe component. Because the end gables are made integral with the mound, the space between the mound and the pipe component need not be sealed with any separate means.
According to a second preferred embodiment of the invention the insulating material preferably comprising a liquid foaming material is fed into the space , 7~3 I
between the solidified thermoplastic layer and the pipe component through a hole made in the sheath surface of the layer. Also this step can be easily automatized which Involves additional cost savings.
I-t is oaken desirable, for example, in view of strength requirements to make -the insulating material adhere to the part to be insulated, in other words, in this case to the metal pipe. This can be made possible by cooling the pipe component during the formation of the thermoplastic layer whereby the thermoplastic does not adhere to the metal pipe during heating of the mound.
The cooling can be produced, for example, by feeding a cooling medium into the pipe component.
One preferred embodiment of the method according to the invention will be described in more detail in the following with reference to Figures 2 to 7 of -the accompanying drawings.
The mound 7 shown in the Figures 2 and 3 comprises two symmetrical halves 8 and 9 which are pivotal connected to each other by means of two hinges 10. The mound consists of an elongated cylindrical portion for the main pipe and a bent portion for the branch pipe extending laterally from the first-mentioned portion Both portions have such a configuration that their inner surface is located at a constant distance from the outer surfaces of the main and the branch pipes of the pipe branch. The ends of the mound are provided with gables 11, 12 which, in the closed position of the mound, form a continuous disc-shaped ring around the main and branch pipe. In order to permit the pipes to extend through the gables said gables are provided with recesses 13.
The branch pipe portion is provided with a locking means 14 for locking the mound.
The Figures 4 to 6 illustrate a pipe branch insulated according to an embodiment of the invention and comprising ~L2~7~3 a main pipe 15 and a transverse branch pipe 16 welded to said main pipe. The pipe branch is surrounded by a substantially rigid sistered layer 17 of a thermoplas-tic material. The thermoplastic layer is provided also with end surfaces 18 which extend from -the sheath sun-face to the outer surface of the pipes 15, 16, see Figure 6. The space between the outer surface of the pipes 15, lo and the inner surface of the thermoplas--tic layer is filled with an insulating material 19, preferably comprising foam plastic, which is inserted in this closed space through a hole 20 in the thermos plastic layer.
The pipe branch according to Figures 4 to 6 is insulated according to the invention in the following manner. after the branch pipe 16 has been welded to a lateral opening in the main pipe 15, the pipe branch is positioned in the mound according to Figures 2 and 3 in which a suitable quantity of a preferably particular thermoplastic material is disposed. When -the mound is closed, the pipes are exude in the mound so that they are located along the central longitudinal axes of the mound parts. Hereafter the mound is heated while rota-tying it both around horizontal and vertical axes by means of means (not shown) for such a long time that the thermoplastic material is sistered along -the inner surfaces of the mound. In order to prevent sistering of the material also on the pipe surfaces the pipes are cooled by feeding a cooling medium into them. Hereafter the mound 7 is cooled, and the pipe branch together with the continuous surrounding thermoplastic layer 17 can be removed from the mound. Because material is also sistered on the inside of the gables 11, 12 of the mound, the thermoplastic layer has end surfaces 18 which keep the pipes in position along the center lines of the thermoplastic layer. Hereafter a hole 20 is made in the sheath surface of the thermoplastic layer, and I
I
the closed space between the pipes and the thermoplas-tic layer is filled with a liquid Roaming insulating material 19 through the hole 20 whereaE-ter the insulate Ed pipe branch is ready.
The insulated pipe bend shown in Figure 7 is made in the same way but the mound must of course have the same shape as the pipe bend.
If desired, the cooling of the pipes can be omitted in which case the thermoplastic material is sistered also on the outer surface of the pipes. The gables 11, 12 of the mound can be replaced by sealing plugs which are pressed in between the pipe and the sheath surface of the mound.
Claims (6)
1. A method of insulating a pipe component wherein:
the pipe component is enclosed in a mould whose inner surfaces are located at a distance from the outer walls of the pipe component and whose ends are sealed by means of sealing elements to the pipe component;
a thermoplastic material is fed into the mould which is heated and put in motion so that the thermoplastic material forms a continuous layer along the inner surfaces of the mould; and the mould is removed upon solidification of the continuous layer and the space between said layer and the pipe component is filled with an insulating material.
the pipe component is enclosed in a mould whose inner surfaces are located at a distance from the outer walls of the pipe component and whose ends are sealed by means of sealing elements to the pipe component;
a thermoplastic material is fed into the mould which is heated and put in motion so that the thermoplastic material forms a continuous layer along the inner surfaces of the mould; and the mould is removed upon solidification of the continuous layer and the space between said layer and the pipe component is filled with an insulating material.
2. A method according to Claim 1, wherein the sealing elements located in the ends of the mould comprise end gables of the mould provided with recesses for the pipe component.
3. A method according to Claim 1, wherein the insulating material is fed to the space between the solidified layer and the pipe component through a hole made in a surface of said layer.
4. A method according to Claim 3, wherein the insulating material comprises a liquid foaming material.
5. A method according to Claim 1, wherein the pipe component is cooled during formation of the layer.
6. A method according to Claim 5, wherein a cooling medium is fed into the pipe component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI820775 | 1982-03-05 | ||
| FI820775 | 1982-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1217913A true CA1217913A (en) | 1987-02-17 |
Family
ID=8515173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000422087A Expired CA1217913A (en) | 1982-03-05 | 1983-02-22 | Method of insulating pipe details |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS59500330A (en) |
| AT (1) | AT388429B (en) |
| AU (1) | AU549722B2 (en) |
| CA (1) | CA1217913A (en) |
| GB (1) | GB2134034B (en) |
| WO (1) | WO1983003132A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295840A (en) * | 2014-10-08 | 2015-01-21 | 哈尔滨朗格斯特节能科技有限公司 | Double pipe fitting crossing tee joint for intelligent prefabricated directly-buried insulating pipe and steel pipe and manufacturing method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL136484C (en) * | 1964-11-03 | 1900-01-01 | ||
| SE333236B (en) * | 1968-07-08 | 1971-03-08 | Overman Ab | METHOD OF MANUFACTURING EXPERIENCED ARTICLES OF STYRENE CELL PLASTIC |
| GB1275291A (en) * | 1968-07-11 | 1972-05-24 | Jerome Hallemelson | Improvements in and relating to moulding composite articles |
| GB1311472A (en) * | 1969-03-18 | 1973-03-28 | Rasmussen As E | Pipe system of heat insulated pipes including means for detecting the presence of moisture |
| GB1427232A (en) * | 1973-01-10 | 1976-03-10 | Rasmussen As E | Sealing tube casing for use with pipe systems of prefabricated heat insulated pipes |
-
1983
- 1983-02-22 CA CA000422087A patent/CA1217913A/en not_active Expired
- 1983-03-04 WO PCT/FI1983/000020 patent/WO1983003132A1/en unknown
- 1983-03-04 AU AU13374/83A patent/AU549722B2/en not_active Ceased
- 1983-03-04 AT AT0904083A patent/AT388429B/en not_active IP Right Cessation
- 1983-03-04 JP JP58500962A patent/JPS59500330A/en active Pending
- 1983-03-04 GB GB08406702A patent/GB2134034B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU549722B2 (en) | 1986-02-06 |
| AU1337483A (en) | 1983-10-18 |
| WO1983003132A1 (en) | 1983-09-15 |
| ATA904083A (en) | 1988-11-15 |
| GB8406702D0 (en) | 1984-04-18 |
| JPS59500330A (en) | 1984-03-01 |
| AT388429B (en) | 1989-06-26 |
| GB2134034A (en) | 1984-08-08 |
| GB2134034B (en) | 1985-12-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |