Patents
Sitemap › F16 - Engineering elements or 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 › F16L 9 - Rigid pipes
Patents for F16L 9 - Rigid pipes (18,006)
03/1991
03/19/1991US4999903 Process of manufacturing composite tube by rolling and welding without elongating the same
03/19/1991CA1281663C Profiled plastic band
03/19/1991CA1281662C Fire resistant plastic pipe
03/14/1991DE3927807A1 Bakterizides und fungizides material zum herstellen von klimakanaelen Bactericidal and fungicidal material for the manufacture of klimakanaelen
03/13/1991EP0416317A2 Double-walled pipe element
03/13/1991CN2073066U Variable aperture joint with multiple connection aperture
03/13/1991CN1011955B Extrusion tubes of semicrystalline plastic and their process
03/12/1991US4998565 Reinforced hose
03/07/1991WO1991002929A1 Bactericidal and fungicidal material for use in the manufacture of air-conditioning ducts
03/07/1991DE3929325A1 Double-walled line pipe - made of specified material for both pipes and is monitored for leakage
03/06/1991CN2072628U Anticorrosive wearing prestressed compound cast stone pipe
03/06/1991CN1011872B Method for producing steel reinforced concrete pipe through liner bushing
02/1991
02/27/1991CN2072182U Al-foil compound thermal-insulation ventilation duct
02/27/1991CN2072181U Full-plastic prefabricated buried thermal insulation pipe
02/13/1991CN2071285U 钢套筒混凝土管 Concrete pipe steel sleeve
02/13/1991CN1049222A Inorganic resin tube and its making method
02/05/1991US4990383 Plastic coated steel tube and method for preparing the same
02/05/1991CA1279832C Hollow cylindrical body made from spirally wound extruded plastic strip material
01/1991
01/30/1991EP0410339A2 Double-walled pipe and method of manufacturing the same
01/16/1991CN2069520U Pricking iron lining slip tube
01/15/1991US4985801 Tube for the circulation of a flammable fluid, and conduit made from such tubes
01/13/1991WO1991000974A1 Pipe connection for advance working pipes laid underground by an advance working technique
01/10/1991WO1991000466A1 Composite plastic pipe
01/09/1991CN2069060U Major diameter anticorrosive steel-plastics composite pipes
01/09/1991CN1048443A Light heat-resisting pipes and their production
01/02/1991EP0406227A1 Extruded plastic pipe
01/02/1991EP0405163A1 Plastic piping for ducting reconstruction
01/02/1991CN2068633U Air-duct without flange connection
01/01/1991US4981740 Acid resistant concrete articles, especially sulfur concrete pipes, and a method of manufacturing said articles
01/01/1991US4981527 Tube, bar, sheet or strip made from zirconium alloy resistant both to uniform and nodular corrosion
12/1990
12/28/1990CA2019405A1 Plastic pipe for sewer pipe reconstruction
12/27/1990WO1990015950A1 Arrangement in a drainage system
12/27/1990WO1990015949A1 Pipes with integral sockets
12/27/1990EP0404670A1 Method for the optimisation of multilayer pipes made of composite materials and pipes obtained by the implementation of such method
12/27/1990EP0404557A2 Pipes with integral sockets
12/27/1990EP0403686A1 Pipe, especially for a transverse shaft, expanding shaft or the like
12/27/1990EP0403685A1 Process to produce a pipe section of an expandable shaft
12/27/1990CA1278226C2 Structures reinforced by a heat-indicating composite material
12/25/1990US4979679 U.V. resistant zinc coated PVC or related plastic pipe
12/25/1990US4979296 Method for fabricating helical flowline bundles
12/19/1990EP0402673A2 Transfer tube
12/16/1990CA2012231A1 Transfer tube
12/15/1990CA2019032A1 Tubing
12/15/1990CA2019031A1 Process for the manufacture of a perforated tube
12/12/1990CN2067346U Z-pipe connecting member
12/11/1990US4976291 Cylindrical concrete layer, corrosion resistance protective coating
12/04/1990US4975055 Flexible conduit structure for dental appliances
11/1990
11/28/1990EP0399123A1 Supports for double-containment thermoplastic pipe assemblies
11/15/1990WO1990013767A1 Method and devices for the recycling of containers
11/14/1990EP0396905A1 Coupling sleeve for manifold pipe connections and corresponding manifold pipe
11/07/1990CN2065274U Glued bamboo mat pipe
11/06/1990US4968545 Composite tube and method of manufacture
11/06/1990US4967800 Secondary confinement pipe having segments with interlocking rib and groove joints and coextruded sealant layers #4
11/06/1990CA1275813C Large diameter burried pipe
10/1990
10/30/1990US4966494 Low load pipe for pipe jacking
10/30/1990US4966201 Transfer tube
10/24/1990CN1046306A Acid resistant concrete articles especially sulphur concrete pipes and a method of manufacturing them
10/23/1990US4965107 One end-sealed ceramic double wall-structural tubes
10/17/1990EP0392914A2 Composite tube with a thermoplastic fiber coating and method for producing such a tube
10/17/1990EP0392912A2 Fluid conveying conduit
10/17/1990EP0392894A1 Underground tubular construction and method for its construction
10/17/1990EP0322508B1 Pipe joint element
10/16/1990US4963420 Filler and floatability material - manufacturing process and tubular units that incorporate this material
10/16/1990US4963211 Method of and machine for winding tubes from strip
10/16/1990US4962839 Ducting for transporting granular or powder substances under gravity, in particular on sites having silos
10/10/1990CN2063598U Apparatus for producing reinforced glass fiber tube
10/10/1990CN2063597U Tube with spiral flow ridge on internal surface
10/10/1990CN1046030A Large diam corrosion prevention pipe line made up of full plastics
10/03/1990EP0390745A2 Multilayered pipe, especially hot water pipe
09/1990
09/26/1990EP0389152A1 An assemblable tube or trough for use as a playground slide, a crawling tube, or the like
09/26/1990CN2062777U Glass fibre reinforced plastics tube
09/25/1990US4958959 Method of relining sewers and water lines without excavation
09/25/1990US4958772 Sprinkler line for localized irrigation
09/18/1990US4957793 Multilayer
09/18/1990US4957683 Process for producing a pipe section and compound pipe produced according to this process
09/18/1990CA1274122A1 Manufacture of a composite tube
09/13/1990DE3907785A1 Plastic pipe and process for its production
09/13/1990DE3907078A1 Elongate casting which is subjected to bending stress
09/12/1990EP0386517A1 Conduit
09/11/1990WO1990010606A1 Acid resistant concrete articles, especially sulphur concrete pipes and a method of manufacturing them
09/11/1990CA2048643A1 Acid resistant concrete articles, especially sulphur concrete pipes and a method of manufacturing them
09/05/1990EP0385465A2 Method of making a plastic sewer
09/05/1990EP0385168A2 Improved flexible conduit structure
09/02/1990CA2010210A1 Flexible conduit structure
08/1990
08/30/1990DE3905887A1 Device for the noise damping of pressure surges in water-channelling lines
08/29/1990EP0383864A1 Means for and method of detecting and controlling pipeline leakages
08/22/1990EP0382916A2 Piping assembly for the receipt of cables
08/21/1990US4949895 Process of fixing internally titanium-lined doubled-walled tubing structure to titanium tube sheet
08/21/1990US4949758 Thin-walled small-bore steel tube with case hardened internal surface
08/16/1990EP0382181A2 Concrete tubing reinforced with glass fibres and plastic material nets
08/15/1990CN2060497U Thermal insulation tube for meters
08/15/1990CN2060496U Pipeline attatched to wall
08/09/1990DE4003384A1 Composite metal tube for fuel injection
08/08/1990EP0267907B1 A plastic pipe
08/08/1990EP0193524B1 Pipe
08/08/1990CN2060196U Prestressed steel pipe concrete pressure pipe
08/08/1990CN1009116B Rare-earth grey cast iron waste water pipe
08/02/1990DE3906752C1 Plastic pipe, in particular for sewage
08/01/1990EP0379643A1 Conduit element for a cylindrical duct to convey gaseous media
07/1990
07/31/1990US4944287 Flexible tube of endoscope
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