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Class Information
Number: 285/123.16
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 > Wall configured as mating complementary type (e.g., hot air ducts)
Description: Subject matter wherein the joints are interlocking components (e.g., having male and female configurations).

Patents under this class:

Patent Number Title Of Patent Date Issued
8701467 Flange fitting with leak sensor port Apr. 22, 2014
8308200 Quick connect hose-in-hose coupler Nov. 13, 2012
7997303 Pipe segment for a transfer line for transporting hot particulate material Aug. 16, 2011
7942452 Flange fitting with leak sensor port May. 17, 2011
7798533 Ventilation chimney section and method Sep. 21, 2010
7744134 Connecting insulated duct Jun. 29, 2010
7427084 Hose-in-hose coupler with longitudinally shiftable sleeve Sep. 23, 2008
7000644 Flexible hose Feb. 21, 2006
6634352 Direct venting vent pipe Oct. 21, 2003
6412820 Secured coupling assembly and method of preventing loosening Jul. 2, 2002
6231087 Conical-shaped anchors, and double-containment pipe assemblies having such anchors May. 15, 2001
6113155 Modular nesting metal conduit, in particular for discharging fumes Sep. 5, 2000
6086114 Double-containment pipe assembly with conical-shaped internal anchor Jul. 11, 2000
6076862 Concentric snap-together direct vent structure and associated fabrication methods Jun. 20, 2000
6062608 Coaxial flue-system for direct-vent fireplaces May. 16, 2000
5494319 Sleeved flexible metal piping, method of manufacturing same and flue system application of same Feb. 27, 1996
5368338 Interlocking union system for double containment pipe Nov. 29, 1994
4929000 Multiple walled chimney May. 29, 1990
4781402 Metal chimney assembly Nov. 1, 1988
4724750 Double-walled chimney Feb. 16, 1988
4721299 Structure assembled from structural members Jan. 26, 1988
4720125 Expansion and length adjustment joint Jan. 19, 1988
4669757 High pressure fluid conduit assembly Jun. 2, 1987
4666189 Prefabricated multi-wall chimney May. 19, 1987
4538834 Tubular assembly for transferring fluids Sep. 3, 1985
4428591 Plastic pipe provided with a groove Jan. 31, 1984
4341392 Plastics pipes having walls with lengthwise extending channels Jul. 27, 1982
4296951 Spheroidal interconnector for filtration modules Oct. 27, 1981
4294474 Prefabricated chimney-shaft Oct. 13, 1981
4082322 Chimney construction for heating fixtures Apr. 4, 1978
4064793 Expandable double walled smoke stack Dec. 27, 1977
4037626 High strength composite pipe structure having leakproof joints Jul. 26, 1977
4029344 Connection joint for prefabricated metal chimney Jun. 14, 1977
4029343 Expansion joint for prefabricated double-walled metal chimney Jun. 14, 1977

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