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Class Information
Number: 285/123.15
Name: Pipe joints or couplings > Having plural independent paths > For concentric tubes or pipes (e.g., well casing or wellhead type) > Double-walled or duplex joint
Description: Subject matter comprising an inner pipe concentric with and attached to an outer pipe, forming one unit.










Sub-classes under this class:

Class Number Class Name Patents
285/123.16 Wall configured as mating complementary type (e.g., hot air ducts) 34


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8701467 Flange fitting with leak sensor port Apr. 22, 2014
8517749 System for quick disconnect termination or connection for cryogenic transfer lines with simultaneous electrical connection Aug. 27, 2013
8505981 Gasket-less vent pipe coupling Aug. 13, 2013
8308200 Quick connect hose-in-hose coupler Nov. 13, 2012
8231143 Double pipe containment structure Jul. 31, 2012
8206149 Demountable burner Jun. 26, 2012
8172272 Aircraft fuel pipe coupling May. 8, 2012
8141218 Method for manufacturing a double walled pipeline Mar. 27, 2012
8096586 Double-pipe joint Jan. 17, 2012
8061739 Thermal insulation device of a screwed junction Nov. 22, 2011
8002313 Inline swivel connection for multi-lumen tubing Aug. 23, 2011
7984928 Safety coupling Jul. 26, 2011
7942452 Flange fitting with leak sensor port May. 17, 2011
7942422 Multiwall pipe lip seal joint May. 17, 2011
7931307 Double-pipe joint Apr. 26, 2011
7900969 Connector between a reaction pipe and a cooling pipe and method for connecting a reaction pipe to a cooling pipe Mar. 8, 2011
7866708 Joining tubular members Jan. 11, 2011
7798891 Chimney lining and venting apparatus for use with emissions from an appliance, and method of assembly Sep. 21, 2010
7793992 Junction part for coaxial pipe elements, and a method of joining together coaxial pipe elements Sep. 14, 2010
7758083 Wall bushing for air conditioner Jul. 20, 2010
7740286 Rotary transmission leadthrough provided with a gas return line Jun. 22, 2010
7717473 Dual walled transfer tube May. 18, 2010
7530602 Double-pipe joint May. 12, 2009
7523962 Connection between a wall and a pipe Apr. 28, 2009
7494155 Pipeline for the transportation of liquefied natural gas Feb. 24, 2009
7427084 Hose-in-hose coupler with longitudinally shiftable sleeve Sep. 23, 2008
7353868 Wireline coupler Apr. 8, 2008
7337834 Multi-channel heat exchanger and connection unit Mar. 4, 2008
7287578 Connection between a cooled double-wall pipe and an uncooled pipe and double-pipe heat exchanger including said connection Oct. 30, 2007
7226089 Jacketed pipe flange Jun. 5, 2007
7100946 Bulkhead assembly for use in pipe-in-pipe systems Sep. 5, 2006
7052047 Detachable high-pressure flow path coupler May. 30, 2006
7021670 Joint for double pipe and brazing method thereof Apr. 4, 2006
6997249 Fluid guidance piece with internal temperature equalization Feb. 14, 2006
6971682 Coupling assembly Dec. 6, 2005
6921564 Insulation module, system and method for installation and manufacture Jul. 26, 2005
6913291 Threaded hose-in-hose coupler Jul. 5, 2005
6866299 Slurpie hose connection Mar. 15, 2005
6848720 Shrouded fluid-conducting apparatus Feb. 1, 2005
6701967 Device having a radial partition in a double walled pipe intended for great depths Mar. 9, 2004
6682102 Hose-in-hose coupler Jan. 27, 2004
6640461 Dryer exhaust conduit and flow passage elbow with universal interconnection therebetween Nov. 4, 2003
6634676 Rotomolded containment fitting and method of use Oct. 21, 2003
6634352 Direct venting vent pipe Oct. 21, 2003
6626467 Closure for secondary containment pipe Sep. 30, 2003
6565127 Pipe coupling device and assembly May. 20, 2003
6565126 Multipurpose group, and industrial robot equipped therewith May. 20, 2003
6565464 Hydraulically controlled transmission May. 20, 2003
6533328 Joint for duplex pipes Mar. 18, 2003
6513838 Connection of double-walled pipes Feb. 4, 2003

1 2 3










 
 
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