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US4973524A Expired / Lapsed US ⏱️ 0.0 years remaining

Laminated composite coins and method thereof

Assignee: VDM Nickel Technologie AG
•
Filing: 1989-05-19
•
Granted: 1990-11-27
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Expires: 2009-05-19
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Abstract

Abstract For use in the making of coins a laminated composite is proposed which can be used to substitute coins made of nickel and consists of a combination of a ferritic chromium steel and an austenitic nickel-chromium steel. In dependence of the nature of the existing system used to discriminate the nickel coins to be substituted, a laminated composite may be used which has a core layer consisting of the ferritic chromium steel and provided on both sides with a cladding having a thickness of 2 to 10% of the total thickness and consisting of the austenitic nickel-chromium steel, or a laminated composite which comprises a core layer consisting of the austenitic nickel-chromium steel and provided on both sides with a cladding having a thickness of 20 to 40% of the total thickness and consisting of the ferritic chromium steel. An optimum approxmation of the acceptability ranges adjusted for nickel in the discriminating systems can be achieved by a proper selection of the ratios of the thicknesses of the layers.

Inventors

  • 👤 Ulrich Huebner
  • 👤 Horst Rinke
  • 👤 Hans M. Walter
  • 👤 Gerhard von Loh

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 05:02
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/011; A; A44; A44C; A44C21/00; G; G07; G07D; G07D5/00; G07D5/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 78 words
A method of making coins which are usable as a substitute for nickel-containing coins which comprises the steps of: (a) forming a laminated composite comprising a core layer of a first corrosion-resistant steel and cladding layers on opposite sides of said core layer and composed of a second corrosion-resistant steel, one of said corrosion-resistant steel being a ferritic chromium steel, the other of said corrosion-resistant steels being an austenitic nickel-chromium steel; and (b) coining blanks of said composite.
Claim 2
Independent Claim 78 words
A method of making coins which are usable as a substitute for nickel-containing coins which comprises the steps of: (a) forming a laminated composite comprising a core layer of a first corrosion-resistant steel and cladding layers on opposite sides of said core layer and composed of a second corrosion-resistant steel, one of said corrosion-resistant steel being a ferritic chromium steel, the other of said corrosion-resistant steels being an austenitic nickel-chromium steel; and (b) coining blanks of said composite.
Claim 3
Dependent Claim 26 words
The method defined in claim 1 wherein said core layer consists of said ferritic chromium steel and said cladding layers consist of said austenitic nickel-chromium steel.
Claim 4
Dependent Claim 27 words
The method defined in claim 1 wherein each cladding layer has a thickness which is substantially 2 to 10% of the total thickness of the laminated composite.
Claim 5
Dependent Claim 24 words
The method defined in claim 1 wherein the ferritic chromium steel is X8Cr17 stainless steel and the austenitic nickel-chromium steel is X5CrNi1911 stainless steel.
Claim 6
Dependent Claim 54 words
A coin made from a laminated composite comprising a core layer of a first corrosion-resistant steel and cladding layers on opposite sides of said core layer and composed of a second corrosion-resistant steel, one of said corrosion-resistant steel being a ferritic chromium steel, the other of said corrosion-resistant steels being an austenitic nickel-chromium steel.
Claim 7
Dependent Claim 54 words
A coin made from a laminated composite comprising a core layer of a first corrosion-resistant steel and cladding layers on opposite sides of said core layer and composed of a second corrosion-resistant steel, one of said corrosion-resistant steel being a ferritic chromium steel, the other of said corrosion-resistant steels being an austenitic nickel-chromium steel.
Claim 8
Dependent Claim 26 words
The coin defined in claim 5 wherein said core layer consists of said ferritic chromium steel and said cladding layers consist of said austenitic nickel-chromium steel.
Claim 9
Dependent Claim 27 words
The coin defined in claim 5 wherein each cladding layer has a thickness which is substantially 2 to 10% of the total thickness of the laminated composite.

References Cited (Backward Citations)

US3694271A Cited
US4705727A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-11-26 1994-05-28 1994-11-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-11-26 1998-05-28 1998-11-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-11-26 2002-05-28 2002-11-27 $7700.00 Window Closed / Lapsed

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