US3750253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coinage material
Assignee: Texas Instruments Inc
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Filing: 1971-10-29
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Granted: 1973-08-07
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Expires: 1991-10-29
Abstract
Abstract A low-cost material for making coins is shown to comprise a core layer of low carbon steel, a relatively thin layer of nickel silver metallurgically bonded to each side of the core layer, and a relatively very thin layer of nickel matallurgically bonded to the outer surface of each of the layers of nickel silver material. These materials cooperate to provide a composite coinage material having desirable coinage properties including pleasing surface color, good ring, excellent mintability, good corrosion-resistance and low-cost. The layers of relatively lowcost nickel silver, being of comparable color to nickel, permit use of very thin outer layers of the more expensive nickel without risk of exposing the steel core material on the minted surfaces of coins after coinage wear. In addition, the nickel silver galvanically protects the edge of the steel core layer to reduce the occurrence of rust staining at the edges of the coins.
Inventors
- 👤 E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:07
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/013; B32B15/015; A; A44; A44C; A44C21/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/933; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12639; Y10T428/12646; Y10T428/12771; Y10T428/12861; Y10T428/12882; Y10T428/12903; Y10T428/12917; Y10T428/12924
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
319 words
A composite metal laminate material as set forth in claim 1 wherein said steel layer embodies a steel material selected from the group consisting of a steel material having a composition, by weight, of 0.08 percent (max.) carbon, 0.25 to 0.40 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material having a composition, by weight, of 0.10 percent (max.) carbon, 0.25-0.50 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material having a composition, by weight, of 0.08-0.13 percent carbon, 0.30-0.60 percent manganese, 0.040 percent (max.) phosphorous 0.050 percent (max.) silicon, and the balance iron, a steel material having a composition, by weight, of 0.10-0.15 percent carbon, 0.30-0.60 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material having a composition, by weight, of 0.13-0.18 percent carbon, 0.60-0.90 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material having a composition, by weight, of 0.15-0.20 percent carbon, 0.60-0.90 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, and a steel material having a composition, by weight, of 0.18-0.23 percent carbon, 0.30-0.60 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, and wherein each of said nickel silver layers embodies a nickel silver material selected from the group consisting of a nickel silver material having a composition, by weight, of 65 percent copper, 18 percent nickel and 17 percent zinc, a nickel silver material having a composition, by weight, of 55 percent copper, 18 percent nickel and 27 percent zinc, a nickel silver material having a composition, by weight, of 65 percent copper, 12 percent nickel and 23 percent zinc, and a nickel silver material having a composition, by weight, of 65 percent copper, 10 percent nickel, and 25 percent zinc.
Claim 2
Dependent Claim
104 words
A composite metal laminate material as set forth in claim 2 wherein said core layer has a thickness of about 0.04150 inches and is formed of a steel material having a composition, by weight, of 0.08-0.13 percent carbon, 0.30-0.60 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, wherein each of said nickel silver layers has a thickness of about 0.00200 inches and has a composition, by weight, of 65 percent copper, 12 percent nickel, and 23 percent zinc, and wherein each of said outer metal layers has a thickness of about 0.00225 inches and is formed of nickel.
Claim 3
Dependent Claim
240 words
A coin formed of a composite metal laminate material comprising a core layer of mild steel having a thickness in the range from about 60 to 94 percent of the total thickness of said composite material providing said composite material with selected strength, weight and volume at low cost, a layer of nickel silver consisting essentially of, by weight, from about 55 to 65 percent copper, from about 10 to 18 percent nickel and from about 17 to 27 percent zinc metallurgically bonded to each side of said steel layer, each of said nickel silver layers having a thickness in the range from about 2 to 19 percent of the total thickness of said composite material providing galvanic corrosion protection for the edge of said steel core layer and providing a significant part of the edge of said composite material with a white color, and an outer layer of metal selected from the group consisting of nickel and of cupronickel alloys consisting essentially of from about 15 to 70 percent nickel and the balance copper metallurgically bonded to each of said nickel silver layers, each of said outer layers having a thickness in the range from about 1 to 5 percent of the total thickness of said composite material providing the outer surfaces of said composite material with good mintability and providing the outer surfaces and a significant part of the edge of said composite material with a white color.
Claim 4
Dependent Claim
317 words
A coin as set forth in claim 4 wherein said steel layer embodies a steel material selected from the group consisting of a steel material consisting essentially of, by weight, of 0.08 percent (max.) carbon, 0.25 to 0.40 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material consisting essentially of, by weight, of 0.10 percent (max.) carbon, 0.25-0.50 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material consisting essentially of, by weight of 0.08- 0.13 percent carbon, 0.30-0.60 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material consisting essentially of, by weight, of 0.10-0.15 percent carbon, 0.30-0.60 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material consisting essentially of, by weight, of 0.13-0.18 percent carbon, 0.60-0.90 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, a steel material consisting essentially of, by weight, of 0.15-0.20 percent carbon, 0.60-0.90 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, and a steel material consisting essentially of, by weight, of 0.18-0.23 percent carbon, 0.30-0.60 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, and wherein each of said nickel silver layers embodies a nickel silver material selected from the group consisting of a nickel silver material consisting essentially of, by weight, of 65 percent copper, 18 percent nickel and 17 percent zinc, a nickel silver material consisting essentially of, by weight, of 55 percent copper, 18 percent nickel and 27 percent zinc, a nickel silver material consisting essentially of, by weight, of 65 percent copper, 12 percent nickel and 23 percent zinc, and a nickel silver material consisting essentially of, by weight, of 65 percent copper, 10 percent nickel and 25 percent zinc.
Claim 5
Dependent Claim
101 words
A coin as set forth in claim 5 wherein said core layer has a thickness of about 0.04150 inches and is formed of a steel material consisting essentially of, by weight, of 0.08-0.13 percent carbon, 0.30-0.60 percent manganese, 0.040 percent (max.) phosphorous, 0.050 percent (max.) silicon, and the balance iron, wherein each of said nickel silver layers has a thickness of about 0.00200 inches and consists essentially of, by weight, of 65 percent copper, 12 percent nickel, and 23 percent zinc, and wherein each of said outer metal layers has a thickness of about 0.00225 inches and is formed of nickel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |