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| Number | Title | Issue Date |
| 7748754 | Pipe section provided with a socket end part A pipe section provided with a socket end part for accommodating a spigot end part of a second pipe section, the spigot end part having a sealing ring and the socket end part configured with an obliquely tapered part having areas of varying dimension for deforming t... | 07/06/2010 |
| 6684910 | Multi-layered pipe A pipe of layers of thermoplastic polyolefins of the same type, however with different properties, which are connected inseparably with one another, an outer first layer and a second layer, adjoining the first layer on the inside, consisting of a material... | 02/03/2004 |
| 6540955 | Process of making a socket on a pipe of thermoplastic material A method of forming a socket on a pipe of thermoplastic material is disclosed. In the process, an end section of the pipe is heated in a heating station. Then, the pipe is transferred to a socket-forming station having a socket-forming mandrel. This is fo... | 04/01/2003 |
| 6439617 | Coupler for a pipe or hose section A coupler for a pipe or hose section has a coupling body, at least one coupling piece integrally formed therewith and a pressing sleeve, which can be previously joined to the coupling body. The coupling body and the pressing sleeve can be previously joine... | 08/27/2002 |
| 6368547 | Method for producing an extruded hollow plastic section Apparatus and method for producing a hollow plastic section by extrusion through a die in a horizontal direction. The die has an inner mandrel which forms the cavity in the section. A first sealing plug and a second sealing plug, which sealing plugs are s... | 04/09/2002 |
| 5942171 | Method for manufacturing biaxially oriented tubing from thermoplastic material A tube is extruded from a thermoplastic material and is then forced over a mandrel at an orientation temperature of the material. The mandrel has an expanding section that expands the tube in its circumferential direction. A tube speed controller upstream... | 08/24/1999 |
| 5911933 | Method for producing a thermoplastic tubular profile and internal cooling unit for such a method A tubular profile made of thermoplastic material is formed by extrusion from an extruder. Downstream from the extruder, the tubular profile is cooled both externally and internally by an external cooling unit and an internal cooling unit mounted on the ex... | 06/15/1999 |
| 5817270 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material Method and devices for manufacturing biaxially oriented tubing from thermoplastic material. The method includes forcing the tube over a mandrel at an orientation temperature of the plastic material, which mandrel includes an expansion part which produces ... | 10/06/1998 |
| 5785906 | Method and device for manufacturing biaxially oriented tubing from thermoplastic material A method for manufacturing biaxially oriented tubing from a thermoplastic material. The method includes forcing the tube over a mandrel at an orientation temperature of the plastic material, which mandrel is an expansion part which produces expansion in t... | 07/28/1998 |
| 4855574 | Welding sleeve with connecting means having an upper and lower part Welding sleeve comprising electrically conductive material embedded in the thermoplastic material of the wall of said sleeve. In a sleeve at least two connecting means are present which each comprise at least two metal parts which can cooperate in clamping con... | 08/08/1989 |
| 4768940 | Tube wall thickness measuring device and extrusion apparatus with the device A device for measuring the wall thickness of an extruded tube by means of ultrasonic pulses comprises a tube wall thickness measuring instrument being rotatable about the circumference of the tube and being connected to an arm extending in a plane perpend... | 09/06/1988 |
| 4754781 | Plastic pipe comprising an outer corrugated pipe and a smooth inner wall A plastic pipe consisting of an outer corrugated plastic pipe and an inner smooth wall consisting of a wear resistant elastomer, particularly a thermoplastic rubber fixed in the inner bottoms wave valleys to said outer corrugated pipe. The inner wall cons... | 07/05/1988 |
| 4675965 | Method for manufacturing a pipe part from fibre-reinforced thermosetting synthetic material In the manufacture of a pipe part from fibre-reinforced thermosetting resin, such as a T-piece, preformed pipe parts made of fibre-reinforced thermosetting resin are placed on a mandrel defining the inside shape of the pipe part, the external surface of t... | 06/30/1987 |
| 4662655 | Pipe connection of fibre reinforced plastic pipe parts A pipe connection of a first and a second fibre reinforced plastic pipe by accommodating a free end portion of each pipe in a centering plastic pipe part, an adhesive layer being present between the inner side of the centering pipe part and the outer side... | 05/05/1987 |
| 4642940 | Trellis stake and wire support to be used in connection with such a trellis stake The invention relates to a plastic trellis stake for supporting rows of tensioned wires 12, more particularly for supporting grape vines in vineyards, a wire support to be used in connection with this trellis stake, said stake having been provided with ri... | 02/17/1987 |
| 4636190 | Apparatus for manufacturing a web of plastic bags A web of interconnected plastic bags with gusset folds. Each bag is provided with first fold part seals (8, 9, 10, 11) and with second fold part seals (13, 14, 15, 16). Additional seals (36) extend parallel to fold edges of the foil and are connected with... | 01/13/1987 |
| 4634844 | Electroweldable socket and a device of manufacturing such a socket An electroweldable socket comprising a conducting wire or gauze near the inner wall of the socket, the socket being manufactured by feeding conducting metal wire or gauze to a transverse extrusion head of an extruder and cutting the pipe extruded from the... | 01/06/1987 |
| 4572523 | Sealing joint and retaining ring for pipe grooved bell and straight spigot joint A pipe member having at one end a socket for the insertion of a further pipe member and a corrugation in the wall of the socket containing a packing ring of resiliently deformable material, and a retaining ring received in an internal recess in the packin... | 02/25/1986 |
| 4566704 | Sealing body for a pipe connection A sealing body for a pipe connection bonded chemically and/or mechanically to a fixation part being attachable to an end portion of a socket pipe. The fixation part consists of plastic material or of reticulated elastomer.... | 01/28/1986 |
| 4561107 | Web of plastic bags A web of interconnected plastic bags produced by providing a tubular foil of plastic material with gusset folds with bottom fold part seals at both sides of the tubular foil. Each fold part seal connects a gusset fold part with an opposite part of the out... | 12/24/1985 |
| 4555884 | Plastic glazing profile designed for glazing window-frames A plastic glazing profile for mounting a glass pane in an existing wooden frame comprises a supporting face having at one end thereof an element for fixing a glass pane by means of projections. At its other end the profile comprises a glass pane abutment ... | 12/03/1985 |
| 4534184 | Device for cooling molds A method and device for cooling molds circulating in a horizontal plane, in which siphon action is used to pass cooling liquid from a top gutter through the molds. In this way the whole cooling system is becoming constructively simplified, such that produ... | 08/13/1985 |
| 4495128 | Method for coloring polyvinylchloride Coloring composition for colouring polyvinylchloride comprising at least 40% by weight of coloring pigment and at most 60% by weight of glycerolmonostearate. The composition may be added directly to extruder for extruding polyvinylchloride, the amount of ... | 01/22/1985 |
| 4492867 | Method of and apparatus for determining the state of ageing of plastic products In a non-destructive method the state of ageing of plastic products is determined by means of infrared radiation, which is passed through the product. The invention is based upon the discovery that there is a clear relationship between certain physical an... | 01/08/1985 |
| 4488739 | Insulating pipe part An insulating pipe part of thermoplastic material comprises two opposite sections and one third section disposed at an angle with respect to the former sections, the wall portion of said sections being provided with a continuous wall cutting slit. The pip... | 12/18/1984 |
| 4474723 | Method and apparatus for providing a plastic pipe part with a socket end A plastic pipe part 1 is pushed across a head part 3 of a sealing sleeve 4, being supported by a support 8, thereby providing the plastic pipe part with a widened end 7. Subsequently the widened end is surrounded by an outer mold 11 with three successive ... | 10/02/1984 |
| 4468367 | Method of uniting a plastic fixation part with a sealing body Method for uniting a plastic fixation part with a sealing body comprising a head end and a sealing sleeve, by first molding the sealing body and subsequently molding the plastic fixation part around the head end of the sealing body, thereby protecting the... | 08/28/1984 |
| 4465307 | Pipe coupler for insulated pipes The invention relates to a coupler for insulated plastic pipe ends and a branch pipe end, the insulation being covered with tubular casings. The coupler is provided with anchoring means comprising one or more ribs or cams extending laterally from the cent... | 08/14/1984 |
| 4452303 | Device and a method for recovering heat from the soil A device and method for recovering heat from the soil and groundwater, comprise heat-exchanging means consisting of an inner tube, an outer tube and partitions forming longitudinal channels between said inner and outer tube. An inlet for heat-exchanging f... | 06/05/1984 |
| 4451308 | Method and device for making seals in tubular web provided with side gussets A method of making seals in tubular web provided with side gussets, in which method, after making the seals, sensors for the inner gusset edges are withdrawn outwardly over a certain distance, the position of the sealing devices remaining unchanged, and a... | 05/29/1984 |
| 4450132 | Plastic crate or tray with slide wall injection molding points A plastic crate or tray comprises a bottom and vertical side walls. A side wall comprises inner and outer side wall parts. Injection molding points are present in the lower edge of the outer side wall parts.... | 05/22/1984 |
| 4449910 | Apparatus for making profiled plastic tube Apparatus for making profiled plastic tube and comprising two circulating endless chains, each making a plurality of mold halves move along with a tube coming from an extruder, these mold halves pairwise constituting a mold cavity in which the tube is bei... | 05/22/1984 |
| 4441743 | Adhesively joined pipe connection An adhesively joined pipe connection comprises a male pipe part and a female pipe part of fiber reinforced plastics, both being provided with a foam plastic insulating layer. The foam plastic layer extends to the front end of the receiving portion of the ... | 04/10/1984 |
| 4441744 | Branch pipe part A branch pipe part is provided with a collar and a downwardly extending skirt, the free end of the branch pipe part comprising a first outwardly extending projection and the lower portion of said pipe part being provided with longitudinal incisions allowi... | 04/10/1984 |
| 4441745 | Coupling pipe part for interconnecting corrugated pipe parts A plastic coupling pipe part for connecting corrugated plastic pipe comprises abutment projections and a radially resilient displaceable lip, carrying an inwardly directed cam. The lip is surrounded by openings delimited by a rectangular incision in the p... | 04/10/1984 |
| 4441209 | Plastic bag comprising venting means A plastic bag provided with a filling valve and a gas permeable dust filtering pocket opposite said valve, allowing gas to escape from the interior of the bag. A disconnectable spot adhesive connection exists between a layer of said pocket and the adjacen... | 04/03/1984 |
| 4439990 | Method and device for cooling molds A method and device for cooling molds circulating in a horizontal plane, in which siphon action is used to pass cooling liquid from a top gutter through the molds. In this way the whole cooling system is becoming constructively simplified, such that produ... | 04/03/1984 |
| 4435888 | Apparatus for installing a sealing ring An apparatus for installing a sealing ring in a groove chamber of a socket by impressing said sealing ring comprising a sealing ring impression member and sealing ring retaining means for maintaining the sealing ring in the impressed state said retaining ... | 03/13/1984 |
| 4419067 | Device for connecting plastics tubes by heatsealing Method for connecting thin-walled plastic tubes by heat welding wherein a normal plastic tube is heated and provided with a funnel-shaped widening and another tube is heated and provided with a conical narrowing, the narrowing being pushed into the funnel... | 12/06/1983 |
| 4395379 | Method and device for forming an internal annular groove in a plastic tube part A socket of a thermoplastic pipe is provided with an internal groove by subjecting the tube to an upsetting action and simultaneously inflating the tube by an inner pressure. Subsequently a moulding ring is expanded and the tube is shrunk onto the expande... | 07/26/1983 |
