US4330599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite material
Assignee: Olin Corp
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Filing: 1980-06-09
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Granted: 1982-05-18
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Expires: 2000-06-09
Abstract
Abstract Novel and advantageous metal laminates particularly useful in making coins comprising a copper core and a cladding metallurgically bonded thereto of a copper base alloy containing from 2 to 3.5% aluminum, from 1 to 2.5% silicon and the balance essentially copper. Disclosure also teaches a method of preparing copper laminates by providing a copper core in strip form in the hard temper and a copper alloy cladding fully annealed in strip form, wherein the components are rolled together in a single pass with a reduction of from 50 to 75% to provide the metallurgically bonded laminate.
Inventors
- 👤 Joseph Winter
- 👤 William Brenneman
- 👤 Julius C. Fister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:01
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B23; B23K; B23K20/00; B23K20/04; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/94; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/1291
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
164 words
A composite material having a substantially smooth external surface and a gold color comprising: a core comprising copper core material in strip form in a hard temper having an initial strength of at least 51,000 psi yield strength at 0.2% offset; a cladding comprising a copper base alloy containing from 2 to 3.5% aluminum, from 1 to 2.5% silicon and the balance essentially copper in strip form and being fully annealed to an average grain size of at least 10 microns and having an initial maximum strength of less than 15,000 psi yield strength at 0.2% offset; and a strong metallurgical bond between said core and said cladding capable of being bent 90° and returned without delamination and without substantial interatomic diffusion, said bond being formed by rolling together said core in an unheated condition and said cladding in a single pass with a reduction of 50% to 75% so that said composite has substantially no surface waviness and said substantially smooth external surface.
Claim 2
Dependent Claim
164 words
A composite material having a substantially smooth external surface and a gold color comprising: a core comprising copper core material in strip form in a hard temper having an initial strength of at least 51,000 psi yield strength at 0.2% offset; a cladding comprising a copper base alloy containing from 2 to 3.5% aluminum, from 1 to 2.5% silicon and the balance essentially copper in strip form and being fully annealed to an average grain size of at least 10 microns and having an initial maximum strength of less than 15,000 psi yield strength at 0.2% offset; and a strong metallurgical bond between said core and said cladding capable of being bent 90° and returned without delamination and without substantial interatomic diffusion, said bond being formed by rolling together said core in an unheated condition and said cladding in a single pass with a reduction of 50% to 75% so that said composite has substantially no surface waviness and said substantially smooth external surface.
Claim 3
Dependent Claim
17 words
A composite according to claim 1 wherein the core is clad on both sides with said cladding.
Claim 4
Dependent Claim
33 words
A composite according to claim 2 wherein the core represents 40 to 90% of the thickness of the composite and the cladding represents from 10 to 60% of the thickness of the composite.
Claim 5
Dependent Claim
22 words
A composite according to claim 3 wherein the cladding represents 5 to 30% of the thickness of the composite on each side.
Claim 6
Dependent Claim
13 words
A composite according to claim 1 wherein the core is commercially purity copper.
Claim 7
Dependent Claim
14 words
A composite according to claim 1 having a thickness of from 0.01 to 0.1".
Claim 8
Dependent Claim
23 words
A composite according to claim 1 wherein the copper alloy cladding contains from 2 to 3% aluminum and from 1 to 2% silicon.
Claim 9
Dependent Claim
165 words
A composite metal laminate useful in making coins and having a gold color comprising: a core comprising copper core material in strip form in a hard temper having an initial strength of at least 51,000 psi yield strength at 0.2% offset; a cladding comprising a copper base alloy containing from 2 to 3.5% aluminum, from 1 to 2.5% silicon and the balance essentially copper in strip form and being fully annealed to an average grain size of at least 10 microns and having an initial maximum strength of less than 15,000 psi yield strength at 0.2% offset; and a strong metallurgical bond between said core and said cladding capable of being bent 90° and returned without delamination and without substantial interatomic diffusion, said bond being formed by rolling together said core in an unheated condition and said cladding in a single pass with a reduction of 50% to 75% so that said composite laminate has substantially no surface waviness and a substantially smooth external surface.
Claim 10
Dependent Claim
165 words
A composite metal laminate useful in making coins and having a gold color comprising: a core comprising copper core material in strip form in a hard temper having an initial strength of at least 51,000 psi yield strength at 0.2% offset; a cladding comprising a copper base alloy containing from 2 to 3.5% aluminum, from 1 to 2.5% silicon and the balance essentially copper in strip form and being fully annealed to an average grain size of at least 10 microns and having an initial maximum strength of less than 15,000 psi yield strength at 0.2% offset; and a strong metallurgical bond between said core and said cladding capable of being bent 90° and returned without delamination and without substantial interatomic diffusion, said bond being formed by rolling together said core in an unheated condition and said cladding in a single pass with a reduction of 50% to 75% so that said composite laminate has substantially no surface waviness and a substantially smooth external surface.
Claim 11
Dependent Claim
30 words
A laminate according to claim 8 wherein the core comprises from 40 to 90% of the thickness of the composite and the cladding from 5 to 30% on each side.
Claim 12
Dependent Claim
12 words
A coin made from the composite material set forth in claim 8.
Claim 13
Dependent Claim
14 words
A composite according to claim 8 having a thickness of from 0.01 to 0.1".
Claim 14
Dependent Claim
23 words
A laminate according to claim 8 wherein the copper alloy cladding contains from 2 to 3% aluminum and from 1 to 2% silicon.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |