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| Number | Title | Issue Date |
| 6158474 | Rust-resistant sleeve for use in a branch hole of a water pipeline A reliable sleeve unit with a water-absorbing swelling rubber that provides a reliable seal to a branch hole and the branch stop while controlling the development of rust. The rubber layer is applied on a cylindrical metal sleeve having a flange on its ou... | 12/12/2000 |
| 6039359 | Protective sleeve and related method for protecting a buried pipe joint The present invention teaches a concrete pipe joint construction which includes a steel bell and a spigot joint ring, both protected by an alkali releasing substance contained typically in a composite sleeve. When the spigot is engaged sealably into the b... | 03/21/2000 |
| 5971441 | Rust-resistant sleeve for use in a branch hole of a water pipeline A rust-resistant cylindrical metal sleeve for preventing rust and corrosion from developing around the wall of a branch hole when the sleeve is rigidly fitted into a branch hole that is drilled through the wall of a metal conduit such as a water pipeline.... | 10/26/1999 |
| 5290045 | Seal for joint, and method of installing same seal The invention relates to a seal (1) for a joint comprising a cylindrical inner core layer (2) made of a water-unexpansible flexible material and having an internal opening (2a), and an outer coating layer (3) which is made of a water-expansible rubber. Th... | 03/01/1994 |
| 5193960 | Washer with elastic water-swellable rubber A washer system comprising: an annular washer having a central opening and an annular packing member which is coaxially arranged with the annular washer, at least a portion of the annular packing member being arranged within the central opening of the ann... | 03/16/1993 |
| 5172919 | Appliance for preventing water from leaking through joint A seal, constituted by a water-expansible portion and a water-unexpansible portion, prevents water from leaking in a construction joint. The expansible portion surrounds the unexpansible portion everywhere except on a side of the unexpansible portion whic... | 12/22/1992 |
| 5096206 | Pipe joint sealer A pipe joint sealer for providing a watertight joint in metal pipe, cast concrete pipe, plastic pipe and the like is disclosed. The pipe joint sealer prevents fine dirt and sand from entering the pipe through the joint. The pipe joint sealer is comprised ... | 03/17/1992 |
| 4626005 | Fluid-tight flexible connection between hollow sections A fluid-tight flexible connection comprises couplings (27, 28) of soft elastic material, inserted in cavities (11) of hollow sections (12, 13), flexible parts (29) of soft elastic material arranged between the couplings, nipples (32) of hard material inse... | 12/02/1986 |
| 4560718 | High swell gasket material A gasket composition which will swell but not degrade in contact with hydrocarbon oil containing fluids in internal combustion engines comprises a fibrous system and an ethylene propylene rubber binder therefor. Desirably, the fibrous system comprises fro... | 12/24/1985 |
| 4209568 | Bentonite-gelled oil waterproofing composition A bentonite composition useful for preventing a flow of water through a structure is disclosed. The composition has substantially all of the bentonite in non-hydrated form by dispersing the bentonite throughout a non-aqueous gel formed from a non-aqueous ... | 06/24/1980 |
| 4160465 | Emergency water leak plug A temporary plug for plugging a leaking hole in a tank or other vessel containing water; the plug consisting of a porous fabric bag partly filled with a dry powder having the characteristic which, upon getting wet, expands several times its volume so to t... | 07/10/1979 |
| 4156540 | Sealant for hose fittings A means for ensuring a firm seal between a hose fitting and a hose comprising a sealant that also acts as a lubricant and is applied to the nipple portion of the fitting prior to insertion into the core tube of the hose. The sealant causes the core tube o... | 05/29/1979 |
