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Erasable inks

  • US 5,599,853 A
  • Filed: 10/07/1994
  • Issued: 02/04/1997
  • Est. Priority Date: 01/29/1993
  • Status: Expired due to Term
First Claim
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1. A writing instrument comprising an outer body;

  • a writing tip at one end of said body;

    a reservoir included within said body and in fluid communication with said writing tip; and

    within said reservoir an aqueous-based, non-shear thinning ink that is erasable from and capable of forming a read-through tracing on 60 lb. offset printing paper, said ink comprising water, a colorant, and a styrene-butadiene copolymer having a styrene content of less than about 35%.

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