(under the class definition) Subject matter in which the flow of fluid is controlled in response to the destruction, fusion or permanent deformation of an element or body.
(1) Note. The destruction, fusion or deformation may result automatically in response to the existence of some condition causing destruction, fusion or deformation (e.g., heat), or may be deliberately brought about by external means.
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318, for tapping a system under pressure by making an aperture therein.
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166, Wells,
316+, for closures used in wells and destructible by drilling.
222, Dispensing, 54, for automatic control of dispensers by fusible or soluble means; subclasses 80+ for dispensers having a cutter or punch associated therewith; subclasses 541.1+ for dispensers having a frangible outlet element.
251, Valves and Valve Actuation,
1.2, for a blowout preventer having a deformable annulus.
