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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0366177 (1989-06-14) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 10 인용 특허 : 4 |
A new manhole cover support and its processes of manufacture and use are shown. Such cover supports are used to raise the effective grade of the existing manhole cover as before road resurfacing. The cover supports are mounted upon an existing manhole cover receiving structure which has an upwardly-
A manhole cover support having improved retainability in service and resistance to dislocation from vehicular traffic running over it, the cover support being adapted for emplacing over and raising the effective grade of an existing manhole cover receiving structure which has an upwardly-extending s
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