US PATENT SUBCLASS 405 / 105
.~.~.~.~.~ Gate unseating

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

52  DF  FLUID CONTROL, TREATMENT, OR CONTAINMENT {7}
80  DF  .~ Flow control {7}
87  DF  .~.~ Water gate or adjustable weir {7}
103  DF  .~.~.~ Sliding {1}
104  DF  .~.~.~.~ Vertical {2}
105.~.~.~.~.~ Gate unseating

DEFINITION

Classification: 405/105

Gate unseating:

(under subclass 104) Method or apparatus wherein (a) means are provided for shifting the movable member out of contact with a cooperating sealing surface prior to or at the moment vertical movement begins, or (b) the movable member and the cooperating sealing surface are so configured that as the member is moved vertically from its sealing position, the member moves entirely off the sealing surface.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

157+, for valves having unseating mechanisms.