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  • 검색어에 아래의 연산자를 사용하시면 더 정확한 검색결과를 얻을 수 있습니다.
  • 검색연산자
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"

특허 상세정보

Ruggedized calculator

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) G06C-005/02   
미국특허분류(USC) 235/1D ; 200/301 ; 200/3021 ; 206/523
출원번호 US-0913713 (1986-09-30)
발명자 / 주소
인용정보 피인용 횟수 : 173  인용 특허 : 3
초록

This invention provides a ruggedized calculator having shock-absorbant layers around a relatively unbreakable hard plastic case. Flotation cells enable this unit to float and various seals render it dust-proof and water-tight. Power can be selectively supplied from a solar unit or rechargeable batteries. The keypads are large so they can be manipulated with gloves on and membrane switches prevent dirt, dust, and moisture from reaching the electronics package.

대표
청구항

An improved calculator comprising: electronic circuit means including a plurality of conventional keypad switchs; a digital readout displaym eans; a carrier frame for operatively housing said digital read out display means and said electronic circuit means including said keypad switches; means for covering the rear of said frame, said covering means including means for enabling said calculator to float; means for housing a source of potential in said frame for operating said electronic circuit means; means for covering the front of said frame with a face...

이 특허를 인용한 특허 피인용횟수: 173

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