US PATENT SUBCLASS 137 / 68.27
.~.~.~ Specific weakening point

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

67  DF  DESTRUCTIBLE OR DEFORMABLE ELEMENT CONTROLLED {2}
68.11  DF  .~ Destructible element {9}
68.19  DF  .~.~ Rupture disc {6}
68.27.~.~.~ Specific weakening point

DEFINITION

Classification: 137/68.27

Specific weakening point:

(under subclass 68.19) Subject matter specially modified to have an area of varied thickness creating a vulnerable section to enable the pressure disc to more easily break.