US4362262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a composite material
Assignee: Olin Corp
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Filing: 1981-09-21
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Granted: 1982-12-07
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Expires: 2001-09-21
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
2026-11-03 12:21
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/04; B23K20/22; B23K20/233; B32; B32B; B32B15/00; B32B15/01
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A method of forming a metallurgically firmly bonded composite material having a smooth external surface which comprises: providing a copper core material in strip form in the hard temper having a minimum strength of 51,000 psi yield strength at 0.2% offset; providing a copper alloy cladding in strip form being fully annealed to an average grain size of at least 10 microns and having a maximum strength of less than 15,000 psi yield strength at 0.2% offset; and rolling together said core and cladding in an unheated condition in a single pass with a reduction of 50 to 75% to provide a metallurgically firmly bonded composite.
Claim 2
Independent Claim
106 words
A method of forming a metallurgically firmly bonded composite material having a smooth external surface which comprises: providing a copper core material in strip form in the hard temper having a minimum strength of 51,000 psi yield strength at 0.2% offset; providing a copper alloy cladding in strip form being fully annealed to an average grain size of at least 10 microns and having a maximum strength of less than 15,000 psi yield strength at 0.2% offset; and rolling together said core and cladding in an unheated condition in a single pass with a reduction of 50 to 75% to provide a metallurgically firmly bonded composite.
Claim 3
Dependent Claim
29 words
A method according to claim 1 wherein said cladding is a copper alloy containing from 2 to 3.5% aluminum, from 1 to 2.5% silicon and the balance essentially copper.
Claim 4
Dependent Claim
13 words
A method according to claim 2 wherein the core is commercially purity copper.
Claim 5
Dependent Claim
17 words
A method according to claim 1 wherein the core is clad on both sides with said cladding.
Claim 6
Dependent Claim
29 words
A method according to claim 4 wherein the core represents 40 to 90% of the thickness of the composite and the cladding from 5 to 30% on each side.
Claim 7
Dependent Claim
19 words
A method according to claim 1 wherein the average grain size of the cladding is at least 100 microns.
Claim 8
Dependent Claim
19 words
A method according to claim 1 wherein the resultant metallurgically firmly bonded composite is cold rolled to finish gage.
Claim 9
Dependent Claim
21 words
A method according to claim 1 wherein the resultant metallurgically firmly bonded composite has a thickness of from 0.01 to 0.1".
Claim 10
Dependent Claim
35 words
A method according to claim 1 wherein the core and cladding enter the rolls at an angle of from 5° to 22° and come together for the first time in the bite of the rolls.
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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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |