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Elapsed time indicator

  • US 4,229,813 A
  • Filed: 06/26/1978
  • Issued: 10/21/1980
  • Est. Priority Date: 06/26/1978
  • Status: Expired due to Term
First Claim
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1. A time indicator device comprising:

  • a reservoir, said reservoir containing dimethylpolysiloxane;

    a porous indicator member, one side of said porous member being impregnated with a dye, said dye being at least slightly dispersible in said dimethylpolysiloxane;

    said reservoir and said porous member being in a close relationship with one another;

    said dimethylpolysiloxane adapted to escape from said reservoir upon activation of said reservoir wherein said dimethylpolysiloxane will spread onto said porous member, said dimethylpolysiloxane wetting said porous member thus permitting said dye to flow from said one side of said porous member to the other whereby the movement of said dimethylpolysiloxane on said porous member provides an indication of the passage of time, said dimethypolysiloxane being substantially independent of temperature and relative humidity.

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