US PATENT SUBCLASS 219 / 606
.~.~.~ Ring

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

600  DF  INDUCTIVE HEATING {7}
602  DF  .~ Metal working {1}
603  DF  .~.~ Bonding {7}
606.~.~.~ Ring

DEFINITION

Classification: 219/606

Ring:

(under subclass 603) Subject matter wherein a circular band is bonded to a conductor.

(1) Note. The circular band may be a seat on which a flap or lid rests (e.g., a valve seat).

SEE OR SEARCH THIS CLASS, SUBCLASS:

641, for hardening a valve seat by inductive heating.

642, for hardening a ring or link by inductive heating.

SEE OR SEARCH CLASS

29, Metal Working, 890.12+, for valve making.