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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0320547 (1989-03-07) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 11 인용 특허 : 3 |
A prefabricated stairway formed of a plurality of preformed steps composed of wear-resistant plastic or composite material which can be injection molded in units of one or more steps to permit inexpensive mass production and which are simple and inexpensive to install and can be formed of colored ma
A prefabricated stairway having a plurality of preformed steps, each of said steps comprising: a riser portion extending inclined upwardly and forwardly and having a lower portion which curves forwardly and has a flange projecting downwardly and rearwardly from the edge of said lower portion, a trea
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