(under subclass 492) Product in which adjacent layers, each containing natural rubber*, are disclosed or claimed to differ in composition or properties.
(1) Note. The rubber layers may "differ" in degree of vulcanization, kind or relative amounts of vulcanizers, accelerator or additives or in other disclosed physical properties.
(2) Note. A patent claiming plural layers of rubber, identical in composition, directly adhered to each other (e.g., by molecular attraction or static electricity) and in which an interface can be detected, will be placed in subclass 492.
SEE OR SEARCH THIS CLASS, SUBCLASS:
492, for plural layers of rubber, identical in composition and physical properties, which are directly adhered to each other and see (2) Note above.
