Patent ID: 7637229

Claim:
An odor control additive for litter, comprising: a. a plurality of fragrant-scented balls adapted to be added to litter; b. said fragrant-scented balls comprising a central, open-celled, porous compressible substrate and a barrier coating covering said substrate; c. said central, porous compressible substrate having a linear dimension of about 1000 to 5000 microns and being saturated with a fragrance; d. said barrier coating being supported by said central porous compressible substrate; e. said barrier coating having a thickness of about 75 to 250 microns and being a gypsum composition capable of resisting fragrance degradation by urine and cat or animal excrements; and f. said fragrance being an odor controlling or odor masking compound; whereby said fragrant-scented balls within said litter are operative to break under load in response to the weight of a cat or other animal using said litter box, thereby releasing fragrance saturated in the central porous compressible substrate.