US PATENT SUBCLASS 405 / 259.2
.~.~ Frangible bolt

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

258  DF  EARTH TREATMENT OR CONTROL {5}
259.1  DF  .~ Rock or earth bolt or anchor {5}
259.2.~.~ Frangible bolt

DEFINITION

Classification: 405/259.2

Frangible bolt:

(under subclass 259.1) Subject matter comprising a bolt having structure or a property such that it will break at a predetermined torque.

(1) Note. The bolt is used with a grout in many cases.