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US 4,744,109 AGranted
Gas-sealing insert for floor drains
OwnerGrenville K. Yuillinventor
Life of this patent
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OwnerGrenville K. Yuillinventor
Estimating the term…
A gas-sealing insert for floor drains. The insert comprises a cover for sealing a floor drain opening except for a hole passing through the cover, and tubing suspended below the cover for receiving water passing through the hole. The tubing, at one end, sealingly encircles the opening, and has an outlet at its other end. A water trap, e.g. a U-bend, is provided in the tubing between its two ends and a gas-sealing valve is located at the outlet. The valve can be opened by the presence of water passing through the tubing but closes automatically, preferably under the effect of gravity. The insert can be used to replace a conventional drain cover and seals the drain against seepage of noxious gases, such as radon, from the drain system even if the water in the U-bend evaporates when the drain is not used for prolonged periods.
A drop-in insert for a floor drain having an opening and a pipe extending substantially vertically downwardly from said opening at least for a predetermined distance, said insert comprising:
A drop-in insert for a floor drain having an opening and a pipe extending substantially vertically downwardly from said opening at least for a predetermined distance, said insert comprising:
Dependencies are inferred from the claim text.