Appeal No. 96-1787 Application No. 08/372,482 through column 6, line 11. Based on these teachings, it is evident that the ability of a particular surfactant to form vesicle structures is highly unpredictable; the more so when considering siloxane surfactants of higher complexity than those of Hill, apparently as are those embraced by the instant claims. Thus, at best, it would have been obvious to try substitution of the Kanner surfactant polymers for those of Hill. However, “obvious to try” is not a sufficient basis for establishing a 5Page: Previous 1 2 3 4 5 6 7 8 NextLast modified: November 3, 2007