US3635703A

US3635703A - Ornamental watch case

Info

Publication number: US3635703A
Application number: US807398A
Authority: US
Inventors: Gregory J Pissarevsky
Original assignee: GREGORY J PISSAREVSKY
Current assignee: GREGORY J PISSAREVSKY
Priority date: 1969-03-14
Filing date: 1969-03-14
Publication date: 1972-01-18
Anticipated expiration: 1989-01-18

Abstract

An ornamental watch case is disclosed having unique properties of hardness and brilliance, permitting its functional use and its use as an ornament of jewelry. At the same time, the watch case is made of a cobalt chromium alloy which readily lends itself to precision casting at greatly lesser expense than the technique presently used for watch manufacture.

Description

United States Patent Pissarevsky [451 Jan. 18, 1972 [54] ORNAMENTAL WATCH CASE [72] Inventor: Gregory J. Pissarevsky, 5535 Netherland Ave., Riverdale, NY. 10471 [22] Filed: Mar. 14,1969

[21] Appl.No.: 807,398

[52] US. Cl ..75/171, 58/88 [51] Int. Cl. C224: 19/00 [58] Field of Search ..75/l7 l 170; 148/32, 32.5;

[56] References Cited UNITED STATES PATENTS 1,958,446 5/1934 Prange "75/171 Primary Examiner-Richard 0. Dean Attomey-Pennie, Edmonds, Morton, Taylor and Adams ABSTRACT 3 Claims, No Drawings less expensive watches, by stamping the body of the case from steel, brass or nickel or their alloys. Such watch cases may be chrome-plated or gold-platedand require during their manufacture a multiplicity of steps which greatly increase the expense of the finished product. For example, a simple stamped case containing the bezel portion manufactured of stainless steel and including finishing machining steps will cost from $2 iii-$3 in the United States at the present time. l-lot forging of stainless steel followed by finished machining is somewhat more expensive, yet the finished product is inferior in many ways for the intended purpose. The appearance of the case is dictated by its method of manufacture which provides largely a functional appearance. Whatever pleasing or ornamental effect may be given to the case initially will be quickly destroyed by wear, since stainless steel scratches very easily. I

In order for watch cases to be considered items of jewelry, it has been generally necessary to manufacture the case of solid gold, for example, or to gold-plate the case. Generally, gold cases are expensively machined, and, as in the case of stainless steel, are subject to scratching.

It is the object of the present invention to present a method and product of manufacture which will produce a watch case from a particular alloy which has superior characteristics of manufacture, brilliance, hardness and nontoxicity, obviating many of the difficulties of manufacture found in the prior art.

It is a further object of the invention to disclose a method and a material for the precision casting of watch cases which is a small fraction of the cost of prior techniques, yet producing a watch case of the highest dimensional accuracy and quality.

It has been discovered that watch cases of various designs, both functional and ornamental, may be constructed with extreme simplicity and precision, at greatly reduced expense by the use of an alloy having superior properties for the purpose. The alloy, which contains major percentages of chromium and cobalt, is readily cast into the most intricate and precise shapes, and has the property of not shrinking during casting while being entirely free of voids, bubbles and other casting defects. Moreover, the alloy can achieve an extremely high lustre while its hardness assures permanency of appearance. The alloy does not corrode and is completely nontoxic, having heretofore been used primarily for prosthetic applications, both internal and external, of the body. More particularly, the alloy used in carrying out the invention has generally the following preferred composition: cobalt 60-65 percent; chromium 25-30 percent; balance molybdenum with perhaps some traces of silicon and manganese.

The foregoing proportions are necessarily representative and some variation of the respective percentages or ofthe constituent parts can be permitted and still achieve the beneficial effects of the present invention. For example, cobalt and chromium percentages of about 50 percent and 20 percent, respectively, can be tolerated together with about 10 percent nickel, 15 percent tungsten and trace elements of iron (2.5 percent), carbon, silicone, manganese( l .5 percent), phosphorous and sulfur.

A precision cast watch case which includes the main body or bezel portion thereof may be made according to the teachings of the present invention in the United States for approximately 60-70 cents, including final polishing. This is only a small fraction of the cost of producing watch cases of other materials and by other manufacturing methods presently known in the art. Various ornamental effects may readily be cast without significant increase in cost. Yet the final product of the inventionis superior in durability, will not corrode, is nontoxic, nonmagnetic and takes a very high lustre.

I claim:

1. A watch case of cast metal, said metal being an alloy consisting essentially of: chromium 20-30 percent; Molybdenum 0-15 percent; tungsten 0-15 percent, nickel 0-l0 percent;

iron 0-2.5 percent; manganese 0-1.5 percent; balance cobalt, and incidental impurities such as carbon, silicon, phosphorous, and sulfur.

2. A watch case according to claim 1 wherein the composition of said alloy is approximately 60-65 percent cobalt; 20-30 percent chromium; balance molybdenum, manganese, and silicon.

3. A watch case according to claim 1 wherein the composition of said alloy is approximately 50 percent cobalt, 20 percent chromium, 15 percent tungsten, 10 percent nickel, balance of iron and manganese with impurities of carbon, silicon, phosphorous, and sulfur.

Claims

2. A watch case according to claim 1 wherein the composition of said alloy is approximately 60-65 percent cobalt; 20-30 percent chromium; balance molybdenum, manganese, and silicon.
3. A watch case according to claim 1 wherein the composition of said alloy is approximately 50 percent cobalt, 20 percent chromium, 15 percent tungsten, 10 percent nickel, balance of iron and manganese with impurities of carbon, silicon, phosphorous, and sulfur.