Edward J Martens III, Phillip J Neumiller: Controlled release air freshener using an absorbent generator. S C Johnson & Son, March 23, 1982: US04320873 (10 worldwide citation)

A method for controlling the rate of evaporation or rate of release of a perfume from an absorbent substrate in a continuous action air freshener comprising incorporating into the perfume from 10 to 900% by weight based on the weight of the perfume of a vapor control agent selected from the group co ...