US PATENT SUBCLASS 264 / 428
.~.~ Including vitrifying or sintering (e.g., fusing, firing, burning, etc.)

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

405  DF  DIRECT APPLICATION OF ELECTRICAL OR WAVE ENERGY TO WORK (E.G., ELECTROMAGNETIC WAVE, PARTICULATE, MAGNETIC, INDUCTION HEAT, SONIC, ELECTROSTATIC ENERGY, ETC.) {26}
427  DF  .~ Producing or treating magnetic product precursor thereof {2}
428.~.~ Including vitrifying or sintering (e.g., fusing, firing, burning, etc.)

DEFINITION

Classification: 264/428

Including vitrifying or sintering (e.g., fusing, firing, burning, etc.):

(under subclass 427) Processes wherein the magnetic product is subjected to temperatures sufficiently high (with or without pressure) which causes said article to, at least partially, coalesce or fuse.

(1) Note. The term firing recited in a patent is considered to read on either sintering or vitrifying and is included herein, unless the firing is disclosed as being for some other purpose or at a clearly too low or inadequate temperature to accomplish sintering or vitrifying. Firing to render a mass friable (calcining) or firing at a temperature only sufficient to drive out the moisture content would, for example, be excluded.

SEE OR SEARCH THIS CLASS, SUBCLASS:

125+, for processes of sintering or heat fusion of particles to autogenously bond, without the use of electrical, particulate or wave energy.

239+, for processes of sintering or heat fusion of particles wherein the particulate material is completely melted, without the use of electrical, particulate, or wave energy.

434, for processes of sintering or vitrifying inorganic material.

603+, for processes of sintering or vitrifying a shaped inorganic preform external of a mold, without the use of electrical, particulate, or wave energy.