US PATENT SUBCLASS 137 / 68.29
.~.~.~ Knife or cutter causes disc to break

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}
68.29.~.~.~ Knife or cutter causes disc to break {1}
68.3  DF  .~.~.~.~> Movable knife or cutter

DEFINITION

Classification: 137/68.29

Knife or cutter causes disc to break:

(under subclass 68.19) Subject matter penetrated by a piercing device to enable the disc to more easily break when the internal pressure in the system becomes excessive.