US PATENT SUBCLASS 148 / 564
.~.~ Superplastic (e.g., dynamic recrystallization, etc.)


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}
559  DF  .~ Heating or cooling of solid metal {22}
564.~.~ Superplastic (e.g., dynamic recrystallization, etc.)


DEFINITION

Classification: 148/564

Superplastic (e.g., dynamic recrystallization, etc.):

(under subclass 559) Process wherein a metal or metal alloy possessing the characteristic of not rupturing or "necking down" when extensively deformed is produced or treated by a process under the class definition and wherein, if metal working is part of the process, a working temperature is provided as an indication of significant heating.

(1) Note. The term "superplastic" or "dynamic recrystallization hot working" is indicative of microstructural change. However, if a metal working step is present, placement goes to the metal working classes, unless the operation provides a working temperature which in combination with said terms will be sufficient criteria for placement in Class 148. Moreover, a combination of (1) the metal class working of "superplastic" metal or metal alloy at a nonspecified temperature and (2) a Class 148 operation goes in Class 148.

(2) Note. Superplastic deformation (1) is often induced by heating and working a metal or metal alloy, possessing a very fine grain structure, resulting in deformation exceeding 100 percent (i.e., based on elongation) and (2) is associated with phase change or allotropic transformation during the deformation.

SEE OR SEARCH CLASS

72, Metal Deforming, appropriate subclasses for a process of working a metal undergoing dynamic-recrystallization or plastic deformation, if no temperature is provided.

420, Alloys or Metallic Compositions,

902, for metal alloys exhibiting superplastic behavior.