A cellulosic fibrous structure, such as paper. The fibrous structure has at least three intensively distinct regions. The regions are distinguished from one another by intensive properties such is basis weight, density and projected average pore size, or thickness. In one embodiment, the fibrous structure...http://www.google.com/patents/US5277761?utm_source=gb-gplus-sharePatent US5277761 - Cellulosic fibrous structures having at least three regions distinguished by intensive properties
