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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0411766 (1989-09-25) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 5 인용 특허 : 3 |
In a pipeline road crossing a pipeline is loosely surrounded by a casing under the roadbed with its ends vented to the atmosphere and sealed with the periphery of the pipeline to minimize oxidation of the pipeline wall within the casing. Access and pressure relief valves are connected with the casin
In an elongated fluid conductor traversing a roadway in downward vertically spaced relation with respect to the roadway and loosely surrounded by a casing sealed at its respective end portions with the exterior of the conductor and forming an annulus around the conductor, said casing having a vent p
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