US PATENT SUBCLASS 359 / 536
.~.~ Minute transparent spheres

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

515  DF  SIGNAL REFLECTOR {11}
534  DF  .~ Including a curved refracting surface {4}
536.~.~ Minute transparent spheres {4}
537  DF  .~.~.~> Directional reflection (e.g., prevent viewing unless critical angle of light is used)
538  DF  .~.~.~> On flexible substrate (e.g., flexible sheeting, bumper sticker, etc.)
539  DF  .~.~.~> Mixture in liquid binder (e.g., paint, resin)
540  DF  .~.~.~> Placed on top of binder (e.g., resin, asphalt, glue, etc.) {1}

DEFINITION

Classification: 359/536

Minute transparent spheres:

(under subclass 534) Subject matter where the elements which refract and reflect are tiny transparent spheres, commonly called "little glass beads".

(1) Note. The elements may be partially or fully embedded. The matrix may be attached to a surface of any shape such as a spherical or a flat surface.

(2) Note. These spheres range in size between 3-6 mils (i.e., 0.003 - 0.006 inches).

SEE OR SEARCH THIS CLASS, SUBCLASS:

539, for a mixture of spheres in a liquid binder (e.g., paint or resin).

540, for spheres placed on top of a binder (e.g., resin, asphalt, glue).

SEE OR SEARCH CLASS 501, Compositions: Ceramic,

34, for reflective glass beads.

523, Synthetic Resins or Natural Rubbers,

219, for process of forming glass void.