US PATENT SUBCLASS 264 / 517
.~ Bulk deposition of particles by differential fluid pressure

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

500  DF  DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO PERMANENTLY SHAPE, DISTORT, OR SUSTAIN WORK {14}
517.~ Bulk deposition of particles by differential fluid pressure {1}
518  DF  .~.~> Continuous or indefinite length

DEFINITION

Classification: 264/517

Bulk deposition of particles by differential fluid pressure:

(under subclass 500) Processes directed to bonding to each other individually distinct particles which are associated randomly by bulk handling or deposition to form a layer containing a major amount of the particulate material.

(1) Note. The relative sizes of the particles are immaterial; however, the particles must retain their discrete nature during the associating and bonding operation. Further, the mere presence of particles in a liquid carrier is not sufficient for this subclass (e.g., fillers or slurries), this being considered to be the molding or a fluent or liquid mass rather than the association of particles and is provided for in appropriate subclasses below.

(2) Note. The material is usually but not necessarily in the form of fibers or granules and bonding of the particulate material may be effected by applying an adhesive or by the

latent adhesive characteristics of the material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

109, and the notes thereunder for bulk deposition of particulate nonmetallic material without the application of direct fluid pressure.

SEE OR SEARCH CLASS

419, Powder Metallurgy Processes, 39+, for processes for making articles from metal-containing particulate material using pressure and heat wherein the particulate material is formed into a shaped body prior to sintering or heating and a specific pressure or the lack of pressure is recited for the forming step.