US PATENT SUBCLASS 277 / 301
.~ 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

300  DF  PROCESS OF DYNAMIC SEALING {6}
301.~ Close proximity seal (e.g., contactless, fluent, etc.) {4}
302  DF  .~.~> Magnetic
303  DF  .~.~> Labyrinth
304  DF  .~.~> Formed by pressurized sealing fluid introduced to form barrier
305  DF  .~.~> Floating ring or bushing

DEFINITION

Classification: 277/301

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

(under subclass 300) Process of dynamic sealing 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:

409+, for a dynamic, close proximity seal (e.g., contactless, fluent, etc.).

904, for a seal formed by a viscous fluid usually contained by one or more physical, contacting-type seals.