Barrier system for dual-pulse rocket motor

Claim 1

A barrier system for use in dual pulse, solid propellant rocket motors comprising an assembly positioned between a first and second pulse rocket propellant gain, said assembly being adhesively attached at one end to the interior diameter of a rocket motor case liner and composed of (1) a restrictor assembly having (a) a dual layer of rubber with one surface thereof positioned adjacent to said first pulse grain to function as a grain inhibitor and flame barrier during the burnout of the said first pulse grain and (b) a thin plastic film positioned adjacent to the other surface of said dual layer of rubber; (2) a thermal barrier assembly having a dual layer of rubber positioned adjacent to said thin plastic film of said restrictor assembly; and (3) an igniter assembly covered by a thin plastic film and positioned adjacent to said thermal barrier assembly, and interdisposed between said thermal barrier assembly and said second pulse grain to activate the ignition of said second pulse grain subsequent to the burnout of said first pulse grain.