A hydrating cat litter which solidifies upon contact with liquids to encapsulate pet waste matter. The litter comprises a mixture of a granulated, organic base material, which is susceptible to decomposition, a gluten containing material, such as ground wheat, and may include a fragrance carrier. In...http://www.google.es/patents/US5361719?utm_source=gb-gplus-sharePatente US5361719 - Biodegradable hydrating cat litter
