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| Number | Title | Issue Date |
| 7798533 | Ventilation chimney section and method A ventilation chimney or exhaust fan flue section for hog barns has inner and outer plastic tubes formed by edge welding plastic sheets. A snug fitting insulation sheet is slid between the tubes. Collars of male and female coupling elements are inserted into the end... | 09/21/2010 |
| 7427084 | Hose-in-hose coupler with longitudinally shiftable sleeve A double walled assembly including a primary assembly and a secondary containment assembly. The secondary containment assembly has a second hose casing, a second fixed containment casing and a second releasable coupler assembly mounted on the second hose casing and ... | 09/23/2008 |
| 7209739 | Method and system for processing calls within a local micro network A method and system for processing calls in a telecommunications system using fiber extender loops providing a local micro network. Calls originating from subscribers within the local micro network to subscribers that are also provided service within the local micro... | 04/24/2007 |
| 7000644 | Flexible hose A flexible hose for use as a refrigerant passageway in a vehicular refrigerating cycle has an inner hose and an outer hose. The outer hose covers the inner hose with a space formed in a given distance. The outer hose and the inner hose are formed of resin having fle... | 02/21/2006 |
| 6971682 | Coupling assembly A coupling assembly for fuel transfer includes a first inner conduit attached to a first ferrule adapter and a second inner conduit attached to a second ferrule adapter. An inner conduit coupling engages the first inner conduit sealing mechanism and the second inner... | 12/06/2005 |
| 6634352 | Direct venting vent pipe A venting system for a direct vent fireplace or other direct vent appliance to direct combustion gases to an exterior area. The direct venting vent pipe facilitates unrestricted lengths of pipe installations. The vent pipe has a double wall construction f... | 10/21/2003 |
| 6412820 | Secured coupling assembly and method of preventing loosening A coupling assembly includes a first coupling member, a second coupling member, and a coupling nut disposed over a portion of the second coupling member and threadingly engaging the first coupling member to retain the first and second coupling members tog... | 07/02/2002 |
| 6231087 | Conical-shaped anchors, and double-containment pipe assemblies having such anchors An anchor support is provided for a double-containment piping assembly having at least one outer piping component defining a first diameter, and at least one inner piping component received within the at least one outer piping component and defining a sec... | 05/15/2001 |
| 6113155 | Modular nesting metal conduit, in particular for discharging fumes An interfitting modular metal duct made up of elements forming an inner d, pairs of elements being united by respective collars, sealing between the two elements being provided by a lip gasket and a fold chamber mounted in the female end of an element an... | 09/05/2000 |
| 6086114 | Double-containment pipe assembly with conical-shaped internal anchor An anchor support is provided for a double-containment piping assembly having at least one outer piping component defining a first diameter, and at least one inner piping component received within the at least one outer piping component and defining a sec... | 07/11/2000 |
| 6076862 | Concentric snap-together direct vent structure and associated fabrication methods Each longitudinal section of a concentric direct vent duct structure for a fuel-fired appliance, such as a furnace, is formed using a tubular outer duct having an axially spaced pair of triangular stand-off frame members anchored therein, and a smaller di... | 06/20/2000 |
| 6062608 | Coaxial flue-system for direct-vent fireplaces A coaxial pipe assembly for a direct vent fireplace coaxial flue-system. The coaxial pipe assembly has an inner flue pipe residing within an outer flue pipe where the two pipes are retained to one another. Each flue pipe has a male connector and a female ... | 05/16/2000 |
| 5494319 | Sleeved flexible metal piping, method of manufacturing same and flue system application of same Insulated flexible metal piping is provided which includes a metal piping section having inner and outer windings comprising metal bands which are spiral-wound in overlying relation with their leading and trailing edges forming a spiral, interlocked seam.... | 02/27/1996 |
| 5368338 | Interlocking union system for double containment pipe A containment interlocking union for use with a containment pipe which encloses a carrier pipe. The containment interlocking union is placed in position around a coupling in the carrier pipe. The interlocking union includes a first joint member and a seco... | 11/29/1994 |
| 4929000 | Multiple walled chimney A multiple walled metal chimney formed of a plurality of axially joined chimney sections each of which utilizes positionally captured spacer rings. Joint clamps are used to connect the chimney sections for formation of the complete chimney conduit. The sp... | 05/29/1990 |
| 4781402 | Metal chimney assembly A metal chimney assembly with floating casing walls supported by expansion clips that allow differential expansion longitudinally and radially of banded together chimney wall sections. The clips are attached to interior flue walls and extend outwardly for... | 11/01/1988 |
| 4724750 | Double-walled chimney A double-walled chimney comprising inner and outer concentric pipes providing an annular insulating space between them is made up of coaxial end-to-end inner pipes surrounded by concentric, coaxial outer pipes. The inner pipes meet at a junction transvers... | 02/16/1988 |
| 4721299 | Structure assembled from structural members The structural member, such as a pipe has a pipe wall, whose inner and outer surfaces are formed by plastic surface layers. Between the surface layers is provided a space, which is filled with a material differing from that of the surface layers. If the s... | 01/26/1988 |
| 4720125 | Expansion and length adjustment joint An expansion and length adjustment joint for use with a double walled metal chimney, the chimney having an inner flue wall and an outer casing wall, the adjustment joint having an inner sliding sleeve with a flange at one end thereof. An upper flue wall c... | 01/19/1988 |
| 4669757 | High pressure fluid conduit assembly A tubular conduit assembly for conveying a pressurized fluid is described which includes a plastic inner tube for conveying the pressurized fluid, and a flexible metal outer tube disposed coaxially around the inner tube. The outer tube is constructed from... | 06/02/1987 |
| 4666189 | Prefabricated multi-wall chimney The invention as shown herein demonstrates a prefabricated chimney which can be manufactured in sections of convenient length for handling and shipped to construction sites for venting boilers or the like. The chimney sections are of the multi-wall design... | 05/19/1987 |
| 4538834 | Tubular assembly for transferring fluids A tubular assembly for transferring fluids in relative isolation from the ambient environment is disclosed. The assembly includes at least two similar conduit sections. Each conduit section has contoured ends which may be frusto-conical in shape. Means fo... | 09/03/1985 |
| 4428591 | Plastic pipe provided with a groove A plastic pipe comprises an inner wall and an outer wall, being integral with longitudinal partitions betweem them and bounding longitudinally extending channels and a circumferential, helically or non-helically extending groove, which groove has been for... | 01/31/1984 |
| 4341392 | Plastics pipes having walls with lengthwise extending channels Plastic pipes comprising an inner and outer wall being interconnected by lengthwise extending connecting partitions, forming channels, the ends of the channels being each separately sealed by sealingly pressing the end walls of a channel to each other aft... | 07/27/1982 |
| 4296951 | Spheroidal interconnector for filtration modules An interconnector for the coaxially adjacent permeate tubes of filtration apparatus comprises a molded elastomeric spheroidal body having opposed coaxial bores for receiving the tube ends which extend from filter membrane modules. Complementarily shaped i... | 10/27/1981 |
| 4294474 | Prefabricated chimney-shaft A prefabricated chimney-shaft constructed from an outer sheath surrounding an inner sheath, in which the end portions of the inner and the outer sheaths are interconnected by perpendicularly positioned tie members having bent-over rims joining the sheaths... | 10/13/1981 |
| 4082322 | Chimney construction for heating fixtures A metal chimney construction for use with heating fixtures such as prefabricated fireplaces. The chimney is constructed from pipe sections joined together by an "inside-outside" coupling ring. The ring is formed from thin-gage sheet metal, shaped and seam... | 04/04/1978 |
| 4064793 | Expandable double walled smoke stack A double walled smoke stack is made up of stackable sections. The top part of each section has a member extending between inner and outer shells and is either downwardly prestressed towards the inner shell or is flexible. This allows the inner shell to up... | 12/27/1977 |
| 4037626 | High strength composite pipe structure having leakproof joints An improved plastic composite pipe structure includes an outer corrugated pipe, an inner smooth-walled liner, and joining means including a bell fitting at one end of the liner extending beyond the outer corrugated pipe and a spigot fitting at the other e... | 07/26/1977 |
| 4029343 | Expansion joint for prefabricated double-walled metal chimney An expansion and length adjustment joint for a prefabricated double-walled metal chimney is disclosed. The joint provides for easy installation of the chimney at a job site without cutting of chimney sections. To prevent escape of flue gases, at least one... | 06/14/1977 |
| 4029344 | Connection joint for prefabricated metal chimney A prefabricated metal chimney formed of double wall sections which can be connected so that the inner pipe joints are substantially air or smoke tight. The inner pipes of adjacent sections have end flanges which engage and are held together by an inner ba... | 06/14/1977 |
