发明名称 Conic section compass
摘要 Conic Section Compass (CSC) is a hand-held drawing device. It applies a mathematics concept. CSC can be used to draw circles, ellipses, parabolas, hyperbolas or make surface curvatures of these types. Given a specific mathematics formula of the mentioned curves, users can draw a well defined curve with CSC (just like a compass to drawing a circle).
申请公布号 US5870830(A) 申请公布日期 1999.02.16
申请号 US19970835377 申请日期 1997.04.07
申请人 WU, YEN-HUNG 发明人 WU, YEN-HUNG
分类号 B43L11/04;(IPC1-7):B43L9/02 主分类号 B43L11/04
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