Invisible combined pen having invisible and revealing functions

Invisible combined pen having invisible and revealing functions

  • CN 1,600,564 A
  • Filed: 09/25/2003
  • Published: 03/30/2005
  • Est. Priority Date: 09/25/2003
  • Status: Active Application
First Claim
Patent Images

1. , a kind of disappearing combined pen that hidden function and coloring function are arranged.It is characterized in that:

  • have one can paper write and writing can aerial moisture content and the effect of carbon dioxide under the concealed pen of Lock-out;

    have one when needed can be at any time with disappearing of writing with concealed pen the colour developing pen that again shows of word, the two is combined into a kind of novel attending classes apparatus.

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