Sound absorbing pipe,申请号US19870046687-传众专利搜索

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发明名称	Sound absorbing pipe
摘要	A sound absorbing pipe comprising a circumferential wall, open portions disposed at regular intervals in the circumferential wall having a predetermined area ratio and sound absorbing material disposed in a hollow formed in an interior portion of the pipe.
申请公布号	US4899846(A)	申请公布日期	1990.02.13
申请号	US19870046687	申请日期	1987.05.07
申请人	NITTO BOSEKI CO., LTD.	发明人	FURUTA, NAOYUKI;YAMAMURA, SHINTA
分类号	E01F8/00;G10K11/16	主分类号	E01F8/00
代理机构		代理人
主权项
地址

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