US PATENT SUBCLASS 148 / 101
.~.~ Permanent magnet

Current as of: June, 1999
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148 /   HD   METAL TREATMENT

95  DF  PROCESS OF MODIFYING OR MAINTAINING INTERNAL PHYSICAL STRUCTURE (I.E., MICROSTRUCTURE) OR CHEMICAL PROPERTIES OF METAL, PROCESS OF REACTIVE COATING OF METAL AND PROCESS OF CHEMICAL-HEAT REMOVING (E.G., FLAME-CUTTING, ETC.) OR BURNING OF METAL {17}
100  DF  .~ Magnetic materials {7}
101.~.~ Permanent magnet {2}
102  DF  .~.~.~> Age hardening
103  DF  .~.~.~> Treatment in a magnetic field

DEFINITION

Classification: 148/101

(under subclass 100) Processes carried out with material intended for use as a permanent magnet.

(1) Note. Processes conforming to the above definition, including broad treatment in a magnetic field or broad magnetizing, not carried out simultaneously with another operation, are placed in this subclass. Such processes including a specific step of treatment in a magnetic field or of magnetizing, are placed in subclass 103 unless age hardening is included, in which case the patent is placed in subclass 102 and cross-referenced in subclass 103.

(2) Note. This subclass and the indented subclasses 102 and 103 take processes of treating magnetic material under the definition thereof, wherein the material at some stage of the process is in comminuted form.

SEE OR SEARCH THIS CLASS, SUBCLASS:

300+, for permanent magnetic material resulting from processes classifiable in subclasses 101 to 103, not recited in terms of significant external structure.

SEE OR SEARCH CLASS

29, Metal Working, 607, and 608 for processes of manufacturing permanent magnets not coming within the definitions of Class 148, subclasses 101 to 103, or Class 252, Compositions, subclasses 62.51+. The line involving these three classes is stated in (3) Note and in the search note to Class 29 under the definition of subclass 100 of Class 148.

252, Compositions,

62.51+, for processes as described in the search note to Class 252 under the definition of subclass 100 of Class 148, where the products are permanently magnetic.