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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0609883 (1984-05-14) |
우선권정보 | NO-0000285 (1984-01-25) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 113 인용 특허 : 5 |
A well drilling assembly of the type in which a rotary device is attached to a drawworks, for example to the hoisting hook on a derrick, to which rotary device a hollow shaft is coupled, having a threaded end which is adapted for connection to a complementary threaded end on the drill string, and wh
A well drilling assembly of the type in which a rotary device is suspendable by a hook of a derrick hoisting means, to which rotary device, a hollow shaft assembly is connected having a threaded end which is adapted to be coupled to the end of a drill string, which has complementary threads, and whe
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