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 |
---|---|
국제특허분류(IPC7판) | A63B-069/00 |
미국특허분류(USC) | 473/429 ; 473/330 |
출원번호 | US-0707850 (1996-09-09) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 14 인용 특허 : 13 |
A portable ball batting practice apparatus for attachment to a pre-existing support includes an elongated member having two ends. The elongated member is attached at one of its ends to two tethers. The first tether is resilient and the second tether is a fixed-length tether. Both ends of the two tethers not attached to the elongated member are secured to a single ball. Incorporated into the elongated member is a releasable anchoring system for attaching the elongated member to the support.
A portable ball batting practice apparatus for attachment to a support, comprising: a) an elongated member; b) a resilient tether having first and second ends, wherein said resilient tether first end is secured to said elongated member at a connection point; c) a fixed-length tether having first and second ends, wherein said fixed-length tether first end is secured to said elongated member proximate said connection point; d) a ball, wherein said ball is secured to both said resilient and said fixed-length tether second ends; and e) means for anchoring sa...