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Process for applying identification to objects made of porous material

  • US 4,954,192 A
  • Filed: 08/30/1989
  • Issued: 09/04/1990
  • Est. Priority Date: 08/30/1989
  • Status: Expired due to Term
First Claim
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1. A process for applying a permanent filled engraved identification to the surface of an object made of porous material comprising the steps of:

  • A. coating said surface on which the identification is to be applied with a water soluble sealant of sodium silicate and allowing said coating to dry;

    applying a second coat of sodium silicate and allowing it to dry;

    B. placing a perforated stencil on said surface to provide an opening defining the identification to be applied;

    C. removing said soluble sealant coating and a portion of said porous material from said stencil opening and to a desired depth in said object to provide an engraved identification in said object;

    D. removing said stencil from said object;

    E. applying a flowable epoxy resin to said engraved identification, which resin will set in and fill said engraved identification;

    F. allowing said resin to set; and

    G. applying water to said object for a period of time sufficient to dissolve said water soluble sealant and cause any of said resin which is not in said engraved identification to be released and removed from said surface o said object.

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