US PATENT SUBCLASS 523 / 152
.~.~.~ For wheeled vehicle

Current as of: June, 1999
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523 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
1  DF  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF {71}
149  DF  .~.~ Friction element composition or process of preparing {2}
152.~.~.~ For wheeled vehicle {4}
153  DF  .~.~.~.~> Containing fibrous or polycrystalline refractory oxide
155  DF  .~.~.~.~> Composition devoid of asbestos {1}
157  DF  .~.~.~.~> Containing at least two organic materials, e.g., binder plus other organic material, etc. {1}
159  DF  .~.~.~.~> Containing asbestos and at least one inorganic material

DEFINITION

Classification: 523/152

For wheeled vehicle:

(under subclass 149) Subject matter wherein the composition is used as a friction element for autombiles, trains, trailers, roller skates, skateboards, or other wheeled vehicles.

(1) Note. Any composition used to enhance friction is considered to be a friction element for this subclass.

(2) Note. Asbestos is a group of impure magnesium silicate minerals which occur in fibrous form. Included with the term asbestos are amianthus, earth flax, mountain cork stone flax, fibrous actinolite, amphibole, chrysotile.

(3) Note. Serpentine asbestos is the mineral chrysotile.

(4) Note. Amphibole asbestos includes the minerals, tremolite, actinolite, amosite, crocidolite, and anthopyllite.

(5) Note. For placement of patents in this subclass and its

indents, the classification should be based upon the specification along with the claims. Thus, the specification and the claims should be read to determine if asbestos or an organic or inorganic material is present or absent. A patent which does not claim asbestos but wherein the disclosure is limited to asbestos would be originally classified into an asbestos containing subclass.

SEE OR SEARCH CLASS 152, Resilient Tires and Wheels, appropriate subclasses, particularly

208+, for antiskid tires.

188, Brakes,

250+, for a brake element having significant brake structure and which brake element may include as an element a lining or facing of traction or friction composition.

192, Clutches and Power-Stop Control,

107, for clutches having significant clutch structure which clutches may include as an element a lining or facing of a traction or friction composition.