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Security for images formed by impact based systems

  • US 5,033,773 A
  • Filed: 03/08/1990
  • Issued: 07/23/1991
  • Est. Priority Date: 01/27/1988
  • Status: Expired due to Term
First Claim
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1. A pressure-sensitive image-transfer sheet, comprising:

  • a sheet having a coating of microcapsules on one side thereof, the microcapsules containing a solvent with high degree of paper penetrating capability and a detectable agent therein and rupturable in response to pressure applied from the other side of the sheet to release the solvent and the detectable agent in an image area defined by the pressure-ruptured microcapsules, the penetrating capability of the solvent sufficient to penetrate through an image acceptor sheet in contact with the one side of said sheet to form a confirming image on the opposite side of the acceptor sheet.

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