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| Number | Title | Issue Date |
| 7140388 | Dual ball valve air vent valve A unitary valve housing has an upper and lower portion. The upper portion has an inner chamber for accommodating two spaced apart balls and a cylindrical side skirt with oppositely positioned openings. The lower portion is cylindrical in shape and has a top shelf wi... | 11/28/2006 |
| 7120949 | Multi-purpose drain The purpose of this multi-purpose drain is to prevent foreign matter from intruding into the down stream drainage system while providing a means to maintain the flow of liquid through the system should the primary path of flow become clogged. This invention has a wi... | 10/17/2006 |
| 7080486 | Pass-through firestop device A cast-in-place pass through firestop device for providing a passage in a partition in a structure through which wires, cables, pipes, and the like are run includes a housing having a riser portion with frangible connections that define removable bands that can be r... | 07/25/2006 |
| 7004508 | Flexible drain element A flexible drain element is used in place of a trap and has a section that is flexible with a stiffness that is selected to make clearing blockages easy and expeditious. ... | 02/28/2006 |
| 6959723 | Oil sealant-preserving drain odor trap Improvements in retention of the oily liquid sealant (20) in a oil-sealed odor trap (10B-10M), for drain applications such as a waterless urinal or anti-evaporation floor drain, are accomplished by minimizing turbulence in the oil sealant, such ... | 11/01/2005 |
| 6589440 | Waterless urinal with liquid seal, liquid seal and method of using liquid seal A waterless urinal employs a sealing liquid comprising 4-chloro-3-methylphenol in an amount effective to act as a biocide and a compound selected from the group consisting of (1) branched aliphatic alcohols with C12 to C24 carbon chain ... | 07/08/2003 |
| 6543470 | Flexible trap for drains Traps particularly intended for carrying condensate from air conditioner drip trays towards a drainage system are constructed from a single turn of a flexible thermoplastic pipe; each unit being preformed when in a heat-softened state into a shape of a on... | 04/08/2003 |
| 6250331 | Zero crack-pressure, high-flow valve The present invention is directed to a zero crack-pressure, high-flow valve assembly especially suited for use with blood salvage or recovery systems. The valve assembly cooperates with a valve seat defining an opening for selectively providing fluid comm... | 06/26/2001 |
| 5176165 | Air gap apparatus An air gap apparatus particularly adapted for use in reverse osmosis (RO) units in which reject water must be carried off to a drain line. The apparatus is adapted for incorporation in an RO unit as original equipment or for addition later as an after mar... | 01/05/1993 |
| 5028320 | Sewer catch basin with gas seal for a petroleum refinery or chemical processing plant A sewer catch basin assembly for preventing gases from being discharged from a sewer of a petroleum refinery or chemical processing plant and for preventing the ignition of gases in a sewer by flames and sparks in the area adjacent to the sewer inlet. The... | 07/02/1991 |
| 4953235 | Trap fitting assembly An improved trap fitting assembly (F1, F2) which prevents the spread of fire and smoke through a floor (100,200) of a building is described. The fitting uses a flammable coupling (10, 30) and a non-flammable sleeve (14, 32) inside th... | 09/04/1990 |
| 4831875 | Water trap valve for fail safe operation of an air inleakage monitoring system in a steam turbine Fail-safe bypass monitoring system for measuring volumetric flow rates in a pipe which normally carries a relatively low pressure, low volume gas flow. The system comprises a water trap valve positioned to seal off relatively low pressure gas flow through... | 05/23/1989 |
| 4706701 | Odor trap assembly An odor trap assembly (10) comprising a drain hose unit (12) connected between a holding tank inlet (12) connected between a holding tank inlet (20) and a remote collection receptacle (50); and, a framework unit (11) having at least one elevated support s... | 11/17/1987 |
| 4524795 | Hydraulic device for the drainage of waste water The present invention relates to a waste water outlet for a sanitary plant, comprising a siphon forming a water seal to which is connected a waste pipe for connection with sewers and in which an automatic air valve device and a siphon are combined in one ... | 06/25/1985 |
| 4432384 | Sewer fluid trap A sewer fluid trap is disclosed, consisting of firstly a rigid flat plate permanently secured to a manhole wall surrounding a sewer pipe outlet. This flat plate has a pair of spaced-apart lateral slots. Secondly, an elbow having a lower end submerged in t... | 02/21/1984 |
| 4198717 | Modular assembly for drain trap A trap to be installed in a wall leading to a drain comprises an assembly of interfitted modular units, molded or deep-drawn from corrosion-resistant synthetic resin, which include an upwardly open housing of rectangular outline, a conduit with a bottom i... | 04/22/1980 |
