Patent ID: 7578971

Claim:
A rapidresponse reversible dry surface CO 2 detector comprising a solid support imbedded with a CO 2 detector composition, said CO 2 detector composition comprising a phase transfer agent, a pH sensitive color indicator, and an ethoxylated alcohol, said phase transfer agent being a quaternary ammonium phenoxide of the form where: R 1 , R 2 , and R 3 , are alkyl or substituted alkyl groups each ranging from 8-12 carbons; N is a nitrogen atom Y − is a phenoxide or substituted phenoxide anion, said ethoxylated alcohol is an ethoxylated aliphatic alcohol or an ethoxylated phenol where the total number of carbons ranges from 12 to 54, and said pH sensitive color indicator is sensitive to changes in pH between pH 7 and pH 11.