• US 20100266326A1
  • Filed: 04/21/2009
  • Published: 10/21/2010
  • Est. Priority Date: 04/21/2009
  • Status: Abandoned Application
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First Claim
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1. A mark-erasable pen cap being applied to receive an end of a writing instrument therein, comprising:

  • a cap body made of an elastic erasing material defining a first end and a second end having a containing groove with a containing space to receive the end of the writing instrument therein, said containing grove further comprising;

    a bottom portion neighboring to the first end and having a first diameter;

    an opening portion neighboring to the second end and having a second diameter; and

    a wall portion connecting with the bottom portion and the opening portion, having an inner diameter substantially enlarged from the first diameter to the second diameter.

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