Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8056932 | Duct corner accessory with pivoting flaps The invention relates to a corner accessory for placing at the junction between at least two ducts that extend in different directions, the accessory comprising two distinct flaps, one of which includes a projecting element and the other of which includes a circular... | 11/15/2011 |
| 7393021 | HVAC duct system A duct system generally comprises a flexible duct; a fitting having an end including either an in-turned circumferential lip or a plurality of circumferentially arranged tabs; a collar having a first end and a second end, the first end being adapted to be secured to... | 07/01/2008 |
| 7360799 | Insulation cladding for bends A half elbow used with a second similar half elbow clads insulation or other structures about a bend. Each half elbow is formed of separate segments of thin sheet material fastened together. Each segment includes first and second edges adapted to be fastened to corr... | 04/22/2008 |
| 7312407 | Non-metallic elbow conduit transition fitting A Non-metallic Elbow Conduit Transition Fitting is disclosed. The fitting is specifically suited to interconnect vertical electrical conduit runs and horizontal electrical conduit runs in commercial construction environments. The fitting is suitable for immersion wi... | 12/25/2007 |
| 7210505 | Elbow for a conduit An elbow for a dryer exhaust vent conduit. The elbow can have two nestable channel sections, each channel section having a generally C-shaped cross-section, which may be substantially semi-circular. Each channel section has a connection mechanism along at least one ... | 05/01/2007 |
| 7097804 | Thermoplastic laminate duct A duct formed of a thermoplastic material is lightweight, strong, flame and smoke resistant, and non-toxic. The duct is formed from a flat laminate and does not require a specialized, disposable mandrel for supporting conventional thermoset plies. Preferably, the du... | 08/29/2006 |
| 7063357 | Flexible pipe coupling A flexible pipe coupling having first and second member rotatable relative to one another. The first member defines national pipe taper, or NPT, threads and the second member includes an internal swag member for forming a swagged connection with a flexible pipe. The... | 06/20/2006 |
| 7018127 | Connector for joining two lengths of sheet metal ducting together end-to-end and the two pieces of sheet metal A connector for joining two pieces of sheet metal together end-to-end. A second wall and a first wall define a first channel therebetween, into which a ledge extends, and which lockingly receives one piece of sheet metal, by virtue of at least one reverse button loc... | 03/28/2006 |
| 6588802 | Two-part, clamp-connected chimney flue tee A two-part clamp-connected chimney flue tee. The tee includes an elongated main section which is detachably connected to a transversely extending bull, or snout section. The main section has flue pipe connection ends and an oval cut-out portion in its sid... | 07/08/2003 |
| 6474697 | Exhaust elbow An exhaust elbow (1) is provided with a single exhaust outlet (2) with an outlet mounting flange (3) and at least two exhaust inlets (4, 5, 6) with an inlet mounting flange (7) for fastening on the engine block of a motor vehicle. The exhaust guiding of t... | 11/05/2002 |
| 6471251 | Spirally corrugated pipe elbow and method for manufacturing same A spirally corrugated pipe elbow according to the present invention is constructed in such a manner that after a bend forming portion of a pipe body P having a given length and including a spirally corrugated pipe wall 1, with a partial portion a of the p... | 10/29/2002 |
| 6431611 | Two piece universal elbow An air duct fitting comprising a rectangular cross section duct segment having a central axis, a round cross section duct segment having a central axis, and a transition rectangle-to-round segment, the rectangular cross section duct segment having a later... | 08/13/2002 |
| 6230418 | Low profile dryer exhaust vent system System for installation of a complete, safe, compact, and efficient dryer exhaust. Provides access to internal areas of conduit for dryer lint build-up removal. Allows dryer placement in tight confines: laundry closets, pantry areas, first floor apartment... | 05/15/2001 |
| 6185837 | Anti-torsion dryer connection A vent system has a rotatable connection between flexible conduits, which carry heated air from the dryer to an external location, such as the atmosphere. The vent system consists of a swivel coupler rotatably connecting a pair of flexible exhaust conduit... | 02/13/2001 |
| 6098312 | Exhaust vent adapter for a clothes dryer An adapter for a clothes dryer provides for venting exhaust air from a drying chamber outlet within the clothes dryer cabinet to an exhaust opening in the cabinet wall. The adapter provides for alternative dryer vent exhaust locations without the need for... | 08/08/2000 |
| 5957506 | Sheet-metal insulated register box with adjustable elbow fitting A sheet-metal elbow is coupled by direct attachment to a flat sheet-metal air inlet panel of an air distribution boot or register box by roll-formed flange portions that are mated in interlocking, overlapping engagement with each other. The air inlet pane... | 09/28/1999 |
| 5941231 | Vertical or horizontal vent assembly A gas combustion apparatus including a housing having a top wall and a side wall, the top wall and the side wall defining vertical and horizontal openings, respectively, and the housing defining a combustion chamber having an exhaust opening; a burner mou... | 08/24/1999 |
| 5511829 | Universal connector for downspout drainage extension An adaptor for eavestrough downspouts has two portions of different cross sections. The first section fits outside the downspout and the other fits inside the drainage extensions. The two portions are hinged together. The adaptor is formed with step-down ... | 04/30/1996 |
| 5405174 | Kit and method for producing a connector for fluid pipe elements A kit for producing a non-straight connector for fluid pipe element comprises loose sleeve couplings and at least one flat blank which has been given such a shape and such dimensions that, after forming thereof and interconnecting its opposite ends, it is... | 04/11/1995 |
| 5375891 | Universal connector for downspout drainage extensions An adaptor for connecting industry standard eavestrough downspouts to drainage extensions of a similar or dissimilar cross section and allowing the extension to be pivoted vertically. Such an adaptor is shown with portions having two different cross secti... | 12/27/1994 |
| 5288111 | 90 degree elbow for pneumatic transport pipes A 90° elbow for pneumatic transport pipes includes a tubular asymmetric cross-sectional expansion at the entrance side, a baffle plate along the outer elbow side and a tubular asymmetric cross-sectional contraction at the exit side of the elbow. The baff... | 02/22/1994 |
| 5199190 | Universal appliance venting assembly A venting assembly preferably for a clothes dryer to provide a universal dryer venting assembly directed to a dryer vent and flexible vent tube assembly, has an elbow with swivel fittings at the inlet and outlet. The inlet and outlet connections include s... | 04/06/1993 |
| 5145217 | Universal dryer duct and vent A dryer duct assembly employs two universal elbow components and at least one flexible component. The flexible component has ends capable of connecting to another flexible component or to a universal component without the use of other devices such as hose... | 09/08/1992 |
| 5121948 | Dryer duct and vent assembly including a flexible duct portions Disclosed is a metal dryer exhaust duct assembly using a pair of flexible corrugated metal ducts capable of linear extension and capable of reorientation of the duct ends, a pair of elbow connectors, one for attachment to a dryer exhaust outlet and the ot... | 06/16/1992 |
| 4694547 | One-piece metal covering for insulated pipe bends An improved one-piece metal jacket for insulated pipe elbows, bends and/or turns having a central metal spine spaced apart along which a plurality of opposed pairs of metal fingers extend sufficiently to overlap, longitudinally and traversely forming a we... | 09/22/1987 |
| 4440337 | Method of producing similar deep-drawn parts A method of producing similar deep-drawn parts for double-walled structural parts having uniformly spaced walls and edge welding. During every deep-drawing procedure, a respective planar outer plate, which is placed upon the lower part of the tool, as is ... | 04/03/1984 |
| 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 |
| 4288111 | Joint construction for sheet metal ducts A first section of cylindrical sheet metal duct has a end roll-formed to define an outwardly formed flange, a central cylindrical flange whose axis is parallel to the cylindrical wall of the duct and which is radially outwardly offset from the cylindrical... | 09/08/1981 |
| 4193759 | Rotary kiln with a plurality of planetary cooling tubes A rotary kiln has at one end circumferentially spaced apart outlet openings into each of which extends a sleeve establishing communication between the interior of the kiln and a planetary cooling tube. Encircling the inner end of each sleeve is a refracto... | 03/18/1980 |
| 4054985 | Method for the application of a protection cover around heat or cool insulated tube bends A protective cover for an insulated pipe bend. A corrugated band-form material is spirally wound into a tube and the adjoining tube edges are secured, such as by lapping, to form a non-slipping joint. The corrugated tube thus provided can be readily shape... | 10/25/1977 |
| 4009894 | Fitting for insulated duct Disclosed is a fitting having an attachment configuration for end-to-panel securing of the fitting to an insulated duct. The fitting is provided with a standing flange spaced from the end margin of the fitting a distance substantially equal to the thickne... | 03/01/1977 |
| 3988030 | Slip-joint coupling, method of installing same and frame subassembly for use therewith This invention relates to a slip-joint coupling between a sheet metal duct fitting and the metal frame bordering a rectangular opening in a so-called "duct board" consisting of a fiberglass mat overlayed with a sheet of silvered paper backing adhesively a... | 10/26/1976 |
