Patent ID: 7365238

Claim:
A disposable diaper comprising: a liquid pervious topsheet; a liquid impervious backsheet; an absorbent core positioned between the topsheet and the backsheet; and a dehydration indicator comprising a chemical indicating composition providing a visible signal indicative of a level of dehydration in response to an ionic strength of urine exuded into the diaper by a wearer, the dehydration indicator further comprising an alphanumeric character indicative of the level of dehydration, wherein the chemical indicating composition is covered on the entirety of its wearer-facing surface by a semipermeable membrane formed of cellulose acetate, cellulose diacetate, cellulose triacetate, agar acetate, beta glucan acetate, polymeric epoxides, semipermeable polyurethanes, or semipermeable polyglycolic acid.