US2248100A - Jewel made from golden colored alloys - Google Patents

Description

Patented July 8, 1941 JEWEL MADE FROM GOLDEN COLORED ALLOYS Otto Loebich, Pforzheim, Germany, assignor, by mesne assignments, to Chemical Marketing Company Inc., New York, N. Y.

No Drawing. Application March 11, 1939, Serial No. 261,399. In Germany March 25, 1938 2 Claims.

My invention relates to jewels made from goldcolored alloys, as for instance, rings, bracelets,

necklaces, rimmings of spectacles, lorgnettes,

opera-glasses and the like, which contain gold, copper and zinc as basic components and which may eventually contain also additional components, such as silver, metals of the platinum group, for instance, platinum, rhodium and palladium. I

Jewels made wholly or partly from thosealloys sometimes show the disadvantage to be subjected to a sud-den destruction, for instance, by recomposition. I These destructions may be disengaged also by external influen'ces, as for instance, by the effect of corroding agents, such as perspiration. Hereby the co-operation of tensions which have been gone into the object by rolling, cold-drawing or the like, effect also the destruction which depends therefore on corrosions of tension.

Thorough investigations and experiments have shown that those disadvantages may be avoided by adding small amount of base metals, such as iron, to the alloys for the manufacture of the above mentioned jewels.

The metal which prevents the corrosion of tension may be added tel quel or in the form of a pre-alloy, for instance, with zinc or with gold.

Influences, as for instance, perspiration, which are able to disengage the dangerous tensions with alloys which do not contain iron, perhaps in the presence of the protecting metal ironact in such a way that they aifect only the finest particles of the protecting metal by eventually .dissolving traces of the same and thereby preventing direct attack of the precious metal alloy.

According to my invention the alloys for the manufacture of jewels may contain, for instance:

Parts by weight Furthermore they may contain, for instance, 1 to 30 parts of weightof silver and/or 1 to 15 parts of weight of the metals of the platinum group, such as palladium, platinum, rhodium, either alone or together.

The various alloys for the jewels according to my invention may be smelted in such a way that 100 parts of the alloys contain the desired components, for instance, gold, copper, zinc and iron,

or, for instance, gold, copper, zinc, iron and silver, or, for instance, gold copper, zinc, iron and palladium, or, for instance, gold, copper, zinc, iron, silver, palladium, in such quantities that the amount of the single parts lies within the ranges I have the following composition:

mentioned above and that the sum of the single parts proves to be 100. If one desires to manufacture an alloy with a low grade of gold, for

instance, 33 to 35 parts of gold will be used and be manufactured by well known methods.

An appropriate alloy for the manufacture of a jewel, for instance, a ring, a bracelet, a necklace, a rimming of a spectacle and the like may 1 Parts Gold 333 Copper 390 Zinc 185 Silver 82 Iron 10 Gold 33 to 60 Copper 10 to Zinc 0.5 to 25 Protecting metal, such as iron or the like 0.1 to 5 preferably 0.3 to 3 What I claim is: v

. '1. A jewel made of a gold-colored alloy consisting of 33.3 parts or gold, 39.0 parts of copper, 18.5 parts of zinc, 8.2 parts of silver and 1.0 part of iron.

2. Gold colored jewel formedof an alloy con- 5 parts iron.

. a OTTO LOEBICH.