US PATENT SUBCLASS 277 / 409
.~ Close proximity seal (e.g., contactless, fluent, etc.)

Current as of: June, 1999
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277 /   HD   SEAL FOR A JOINT OR JUNCTURE

345  DF  SEAL BETWEEN RELATIVELY MOVABLE PARTS (I.E., DYNAMIC SEAL) {10}
409.~ Close proximity seal (e.g., contactless, fluent, etc.) {4}
410  DF  .~.~> Magnetic
411  DF  .~.~> Gap or clearance {2}
423  DF  .~.~> Impeller (e.g., slinger, etc.) {5}
431  DF  .~.~> Formed by pressurized sealing fluid introduced to form barrier {1}

DEFINITION

Classification: 277/409

Close proximity seal (e.g., contactless, fluent, etc.):

(under subclass 345) Dynamic seal wherein the sealing means is free of relatively movable sealing contact against the relatively movable parts and capable of acting upon or causing sealed or sealing fluid to oppose the flow of fluid at the joint or juncture between the relatively movable parts.

(1) Note. This and indented subclasses are for a sealing means not dependent upon the physical contact between a sealing member and a relatively movable part to affect

sealing such as abrading or frictional contact that forms a positive seal at the point of contact.

(2) Note. In a close proximity seal (e.g., contactless, fluent, etc.), a distance between a sealing member and a part or another sealing member is not dependent upon rotational speed between relatively movable parts; whereas in a hydrodynamic, relatively rotatable, radially extending sealing face member (e.g., face, mechanical, etc.) the distance will change when the rotational speed from normal operation to slower or nonrotational speeds.

SEE OR SEARCH THIS CLASS, SUBCLASS:

301+, for a process of dynamic close proximity sealing (e.g., contactless, fluent, etc.).

347+, for diverse and distinct dynamic seals including a close proximity seal.

590, for this subclass only, a close proximity seal (e.g., contactless, fluent, etc.) between fixed parts or having a fixed relationship against relatively movable parts. 904, for a seal formed by a viscous fluid usually contained by one or more physical contacting-type seals.

SEE OR SEARCH CLASS

137, Fluid Handling, residual class for fluid, material handling process or apparatus;

248+, for a liquid seal between relatively movable, valving parts.

417, Pumps, for a general means to move a fluid from one place to another having an inlet and an outlet,

423.11, for a rotary electric motor and rotary nonexpansible chamber pump having sealing means therebetween.