Writing instrument with ink quantity of level dete

专利名称：Writing instrument with ink quantity of level

detecting function

发明人：Hiroshi Takagi,Toshiaki Serikawa,Noriaki

Tsunoda

申请号：US07/177469申请日：19880401公开号：US048442A公开日：191226

摘要：A writing instrument with ink quantity or level detecting function which has anink tube containing ink, and a float so arranged in intimate contact with the rear endsurface of the ink in the ink tube as to be driven in contact with the rear end surface ofthe ink upon decrease of the ink in the ink tube. Further, a magnetic sensor is furtherprovided externally at the writing instrument, while the float is formed of magneticmaterial. Thus, lack of the ink in the ink tube of this writing instrument can be readilydetected.

申请人：MITSUBISHI PENCIL CO., LTD.

代理机构：Oliff & Berridge

更多信息请下载全文后查看