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US3634890A
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Metal coins which can be distinguished and separated from one another by physical methods responding to magnetic properties
Assignee: Vereinigte Deutsche Metallwerke AG
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Filing: 1968-05-17
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Granted: 1972-01-18
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Expires: 1988-05-17
Abstract
Abstract In order to make metal disks, especially coins, distinguishable and separable from one another and from disks consisting of other materials on the basis of their magnetic properties, they are made according to the invention of one or more nonmagnetic layers, which consist preferably of a copper-nickel alloy containing 5 to 60 percent nickel, and of one or more layers of magnetic metal, especially nickel, in special, very specific thickness ratios between the magnetic layers and the overall thickness of the metal disks in question.
Inventors
- 👤 Hans Conradt
- 👤 Hugo Zoebe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:05
CPC Classifications
A; A44; A44C; A44C21/00; C; C22; C22C; C22C19/00; C22C19/03; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12882; Y10T428/12903; Y10T428/1291
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
A coin or material as claimed in claim 1, consisting essentially of three layers, the center layer of which is nickel, and the two outer layers of which are each said copper-nickel alloy.
Claim 2
Dependent Claim
30 words
A coin or material as claimed in claim 1, consisting essentially of three layers, wherein the outer layers thereof are nickel and the core layer thereof is said copper-nickel alloy.
Claim 3
Dependent Claim
21 words
A coin or material as claimed in claim 1, wherein said copper-nickel alloy contains about 15 to 30 weight percent nickel.
References Cited (Backward Citations)
US3368880A
Cited
US3407050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |