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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0246236 (1988-09-19) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 3 인용 특허 : 1 |
A combination void drain vent chair for use in the construction of voided concrete shapes, including an elongated tube connecting the interior of the void form to the exterior of the concrete shape, and including a flat flexible member surrounding the upper end of the tube which may be attached to t
A combination void drain vent chair comprising: an elongated tube having an upper and a lower end, a flat member attached to said upper end of said tube, said flat member being spaced from said upper end of said tube and projecting laterally therefrom, and being sufficiently flexible to conform to t
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