검색연산자 | 기능 | 검색시 예 |
---|---|---|
() | 우선순위가 가장 높은 연산자 | 예1) (나노 (기계 | machine)) |
공백 | 두 개의 검색어(식)을 모두 포함하고 있는 문서 검색 | 예1) (나노 기계) 예2) 나노 장영실 |
| | 두 개의 검색어(식) 중 하나 이상 포함하고 있는 문서 검색 | 예1) (줄기세포 | 면역) 예2) 줄기세포 | 장영실 |
! | NOT 이후에 있는 검색어가 포함된 문서는 제외 | 예1) (황금 !백금) 예2) !image |
* | 검색어의 *란에 0개 이상의 임의의 문자가 포함된 문서 검색 | 예) semi* |
"" | 따옴표 내의 구문과 완전히 일치하는 문서만 검색 | 예) "Transform and Quantization" |
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) | E01B-003/00 |
미국특허분류(USC) | 238/060 |
출원번호 | US-0790166 (1997-01-29) |
발명자 / 주소 | |
출원인 / 주소 | |
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 4 인용 특허 : 2 |
An improved unitary steel tie which is positionable in ballast of a railway track system includes an elongated channel body. The channel body includes an elongated web and a pair of sidewalls formed integral with opposite edges of the web. The channel body has a pair of opposed ends. An integral rail seat is adjacent to each of the opposed ends. Each rail seat is formed on the web and is adapted for connecting a rail to the web. An indentation is formed in each sidewall adjacent to each end of the body. The indentations at each end are opposed to each ot...
[ What is claimed is:] [1.] A unitary steel railroad tie positionable in ballast for use in a railway track system comprising: an elongated channel body having a web and a pair of sidewalls formed integral with opposite edges of the web, said channel body having a pair of opposed ends, an integral rail seat adjacent to each of the opposed ends of said channel body, each rail seat being formed on the web and being adapted for connecting a rail to the web, an indentation in each sidewall adjacent to each end of the body, the indentations at each end being ...