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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0076668 (1987-07-23) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 16 인용 특허 : 18 |
A utility cover extension and its process of installation are shown. The extension is adapted to rest on the cover support flange of and make a snug fit in a utility housing for a manhole cover. The extension provides an access opening above the housing. It has a rim and seat that furnish lateral re
A utility cover extension for paving work, said extension being expandable to fit into a utility housing that itself forms a first access opening and possesses a support flange and a retainer which are disposed to support and laterally retain a manhole cover over said first access opening, the utili
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