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Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 8020577 | Rupture disc assembly for pneumatic plugs A rupture disc assembly for pneumatic plugs constructed and arranged to cooperate with an aperture in an end casting or other plug component to expel excess air from the plug interior when a predetermined internal plug pressure is reached. The rupture disc holder as... | 09/20/2011 |
| 7422030 | Air admittance valve assembly A one directional flow valve assembly for a fluid system. The valve assembly is comprised of a valve body having an internal valve chamber in communication with the ambient environment and a valve seat arrangement. The assembly further has a cap structure with means... | 09/09/2008 |
| 7325574 | Rupture disc assembly for pneumatic plugs A rupture disc assembly for pneumatic plugs constructed and arranged to cooperate with an aperture in an end casting of the plug to expel excess air from the plug interior when a predetermined internal plug pressure is reached. The rupture disc assembly utilizes a r... | 02/05/2008 |
| 6557825 | Air admittance valve connector assembly A connector assembly for a plumbing appliance and for sealingly attaching an air admittance valve in a vent pipe. The connector assembly has an elastomeric sealing gasket with an interior threaded bore which is expanded by a rigid bottom portion of an air... | 05/06/2003 |
| 6415816 | Air admittance valve assembly A one directional flow valve assembly for a fluid system. The valve assembly is comprised of a valve body having an internal valve chamber in communication with the ambient environment with a valve seat of a predetermined configuration. The assembly furth... | 07/09/2002 |
| 6250337 | Mechanical plug assembly A two piece mechanical plug assembly for sealing low pressure pipelines. The mechanical plug assembly comprises a rigid body member and a flexible, cylindrical sealing member. The rigid body member has an upper portion and a lower portion of a frustoconic... | 06/26/2001 |
| 6182704 | Frangible sealing plug for pipelines A frangible sealing plug for pipelines comprising a unitary disc shaped fluid impermeable body having a plurality of score lines on one side, and a peripheral score line on the opposite side adjacent a peripheral sealing structure. The peripheral sealing ... | 02/06/2001 |
| 5643386 | Assembly process for fabric bag plug An assembly process for inflatable fabric bag plugs used to seal low pressure pipelines. The assembly process steps include marking and cutting coated fabric elements from a predetermined woven fabric and a plurality of sealing strips. The fabric elements... | 07/01/1997 |
| 5546991 | Inflatable fabric bag plug An inflatable fabric bag plug for sealing low pressure pipelines. The bag plug has a body portion constructed of a coated fabric material and includes a plug body portion, main seam cap strips, first and second end seam cap strips and a plurality of seali... | 08/20/1996 |
| 5353841 | Pneumatic plug for clean-out tees A pneumatic test plug for clean-out tees having an elastomeric inflatable body, a closed top, an inwardly tapered side wall and an open bottom end with a peripheral shoulder having a downwardly extending peripheral ridge. A molded end cap with a cylindric... | 10/11/1994 |
| 5348085 | Mechanical plug device A well monitor plug device for sealing a subwell casing. The plug device has an adjustable and tamper resistant sealing structure which includes a turning member and a cooperating locking member which permits access to a sampling aperture.... | 09/20/1994 |
| 5329646 | Drain flusher device A drain flusher device for dislodging an obstruction in a pipe. The drain flushing device has an elastomeric cylindrical body with an open neck end and nose portion having a thickened end wall. An elongated slit with a predetermined configuration and pred... | 07/19/1994 |
| 5234034 | Pneumatic plug device An elongated pneumatic plug is provided for sealing pipelines. The pneumatic plug has a body structure with a first end cap element, a second end cap element and an expandable elastomeric sleeve with a fixed outer diameter. A fluid ingress and egress valv... | 08/10/1993 |
| 5209266 | High pressure inflatable plug device An inflatable, expansible, multisize plug device which seals and locks the interior of a pipeline section. The plug device comprises a cylindrical body structure and includes a central member and removable inner and outer disc members attached thereto. Th... | 05/11/1993 |
| 5076328 | Pressure relief valve assembly An adjustable pressure relief valve for use in a fluid pressurized system. The pressure relief valve has a valve body with a passage that terminates at inlet and outlet ends. The passage includes a valve chamber, a valve seat at the inlet end, and a valve... | 12/31/1991 |
| 5035266 | Mechanical plug for clean-out tees A mechanical plug device for sealing pipeline access ports having a small threaded inner surface. The mechanical plug device has opposing inner and outer circular plate members. The rigid plate members each have interiorly tapered circumferential shoulder... | 07/30/1991 |
