US PATENT SUBCLASS 428 / 631
.~.~.~.~ Film (e.g., glaze, etc.)

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

544  DF  ALL METAL OR WITH ADJACENT METALS {31}
615  DF  .~ Composite; i.e., plural, adjacent, spatially distinct metal components (e.g., layers, joint, etc.) {15}
621  DF  .~.~ With additional, spatially distinct nonmetal component {7}
630  DF  .~.~.~ Noncrystalline silica or noncrystalline plural-oxide component (e.g., glass, etc.) {1}
631.~.~.~.~ Film (e.g., glaze, etc.)

DEFINITION

Classification: 428/631

(under subclass 630) Subject matter in which the nonmetal component is so thin as to be like a coating on the metal component material.

(1) Note. In most patents of this subclass the product is made by a coating process.