US1569921A - Alloy for pen points - Google Patents

Description

Patented Jan. 19,1926.

UNITED STATES PATENT OFFICE.

IIELVIN M. GOLDSMITH, OF. CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF, BY MESNE ASSIGNMENTS TO GOLDSMITH BROS. SMELTING & REFINING COMPANY, 01 CHI- CAGO, ILLINOIS, A CORPORATION OF WEST VIRGINIA.

ALLOY 'FOR PEN POINTS.

No Drawing.

T 0 all whom it may concern."

Be it known that I, MELVIN M. GonnsMrfn, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, lIEIXe invented a new and useful Improvement in Alloys for Pep Points, of which the follow ing is a specification.

The main objects of this invention are to provide an osmium alloy which will have the hardness and acid resisting characteristics of the native alloy (osmium iridium) without the attendant losses which occur when the native alloy is used in the arts; and to provide an osmium alloy which can be economically worked, to provide an alloy with maximum Wearing ability; to provide an alloy which is comparatively easy to use and to work; to provide an alloy which will retain the hardness and wearing properties of the native alloy osmiridium or iridosmium; to provide an alloy which is fusible with great diliiculty and which can be gold soldered or frozen; to provide an alloy having a melting point between that of ruthenium and gold; to provide an alloy adapted to he worked in an electric furnace which will have more tenacity, uniformity of texture, and retain the hardness of the is further reduced and the tenacity texture is found to be improved when from 3 to 10 per cent of the mixture is made up of one of the lighter metals, nickel, silver, or

the like.

The operation of manufacture of alloys of this class comprises placing the metals in proper proportions in an electric furnace.

After fusion the alloy button is stamped, cracked or crushed to obtain pieces which weigh approximately one-tenth of a grain each. All pieces which are. smaller or are irregular in shape have to be discarded and are lost. Since the basic metals are rare 'vembevr 1923.

Application filed November 16, 1923. Serial No. 675,221.

The properly'shaped and sized pieces are adapted to freezing on and finishing as pen tips and similar wearing surfaces. My dis covery or invention comprises a new osmium alloy which hangs together whencrushed, does not powder, and which is uniform in texture; at the same time thenew alloy has the wearing qualities of the native osmiridium.

In the arts the native alloy osmiridium is known to be the most infusible alloy, at the same time the hardest. It will stand the greatest wear of any known substance. ()ne of the uses is the fusing, soldering, or freezing of a small piece on the tip of a pen to take the wear. The native alloy is very expensive and the preparation of point is both difficult, and expensive because of a large amount of waste which occurs when the native alloy is cracked or broken into commercial tips. This waste comes from two sources; first, the native alloy when crushed or cracked, is prone to divide into small particles, too small to be used, sizes weighing less than one-tenth of a grain each and irregular pieces are lost.

I claim: 7

1. An-osmium alloy comprising 10 to120 per cent of ruthenium, 3 to 10 per cent of cent.

2. As a substitute for osmiridium, an osmium alloy containing twenty or more per cent of osmium, ten or more per cent of ruthenium and a small proportion of nickel relative to the ruthenium. a

3. An osmium alloy comprising osmium, 65 to 85 per cent, ruthenium, 10 to '20 per cent, and a tetrad metal flux, 3 to 10 per cent.

4. An osmium alloy suitable for forming the metal wearing surface of pen tips, comprising'ruthenium in'excess of the amount of osmium present.

5. As a substitute for osmiridium, a hat alloy adapted to provide a durable wearing surface and comprising osmium combined with ruthenium in the same proportion in which iridium occurs in the natural native alloy osmiridium.

Signed at Chicago this 13th day of No- MELVIN M. GOLDSMITH.