Patent US4063346A successfully refreshed from Google Patents.
US4063346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver color proof coin or medal and method of making the same
Assignee: NEW FRANKLIN MINT
•
Filing: 1976-04-29
•
Granted: 1977-12-20
•
Expires: 1996-04-29
Abstract
Abstract A silver color coin or medal is produced from a copper-silver alloy containing from about 30 to 60% by weight of silver. The normal rose color caused by the copper in the alloy is removed by selective electrolytic etching.
Inventors
- 👤 James W. Simpson
- 👤 Andrew Cosgarea, Jr.
- 👤 Richard D. Bankert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:03
CPC Classifications
A; A44; A44C; A44C21/00; Y; Y10; Y10T; Y10T29/00; Y10T29/47; Y10T29/49; Y10T29/4998; Y10T29/49988; Y10T29/49991; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12236; Y10T428/12243; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12882
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A method of making a silver color proof coin or medal from a copper-silver alloy comprising the steps of: a. producing a copper-silver alloy wherein the silver component is from 30 to 60 weight percent of said alloy; b. forming a coin blank from said alloy; c. electrolytically etching said coin blank for a sufficient time to remove a sufficient amount of copper from the surfaces of said coin blank to produce a coin blank having a silver surface color; d. burnishing said electrolytically etched coin blank; and e. coining said coin blank in a highly polished die.
Claim 2
Independent Claim
98 words
A method of making a silver color proof coin or medal from a copper-silver alloy comprising the steps of: a. producing a copper-silver alloy wherein the silver component is from 30 to 60 weight percent of said alloy; b. forming a coin blank from said alloy; c. electrolytically etching said coin blank for a sufficient time to remove a sufficient amount of copper from the surfaces of said coin blank to produce a coin blank having a silver surface color; d. burnishing said electrolytically etched coin blank; and e. coining said coin blank in a highly polished die.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said alloy is approximately 50 weight percent copper and 50 weight percent silver.
Claim 4
Dependent Claim
68 words
The method of claim 1 wherein said coin blank forming step comprises the substeps of: 1. casting said alloy to form an ingot; 2. machining the surfaces of said ingot; 3. rolling said ingot into a sheet of the desired thickness; 4. blanking said sheet to produce planchets; 5. rimming said planchets; and 6. annealing said rimmed planchets to produce a coin blank of suitable hardness for coining.
Claim 5
Dependent Claim
47 words
The method of claim 3 wherein said annealing substep comprises heating said planchets at a temperature which is less than about 100° F. below the melting temperature of said alloy for about 40 minutes to produce a coin blank having a Rockwell B hardness of about 15-50.
Claim 6
Dependent Claim
65 words
The method of claim 1, wherein said electrolytic etching step comprises making said coin blank the anode in an electrolytic cell having an electrolyte concentration of about 10 to 50 percent by volume, applying a current at a current density of from about 10 to about 50 amps/ft. 2 for a sufficient time to remove the copper color from the surface of said coin blank.
Claim 7
Dependent Claim
22 words
The method of claim 5 wherein said electrolyte is selected from the group consisting of sulfuric acid, hydrochloric acid and fluoborate electrolytes.
Claim 8
Dependent Claim
27 words
The method of claim 5 wherein said potential is applied at a current density of from about 15 to about 20 amps/ft. 2 for about 2 minutes.
Claim 9
Dependent Claim
15 words
A silver color proof coin or medal made according to the method of claim 1.
Claim 10
Dependent Claim
15 words
A silver color proof coin or medal made according to the method of claim 2.
Claim 11
Dependent Claim
15 words
A silver color proof coin or medal made according to the method of claim 3.
Claim 12
Dependent Claim
15 words
A silver color proof coin or medal made according to the method of claim 4.
Claim 13
Dependent Claim
15 words
A silver color proof coin or medal made according to the method of claim 5.
Claim 14
Dependent Claim
15 words
A silver color proof coin or medal made according to the method of claim 6.
Claim 15
Dependent Claim
15 words
A silver color proof coin or medal made according to the method of claim 7.
References Cited (Backward Citations)
US1698486A
Cited
US1818379A
Cited
US2285308A
Cited
GB908436A
Cited
US3429751A
Cited
US3533863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |