Patent US2643199A successfully refreshed from Google Patents.
US2643199A
Expired / Lapsed
US
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Process of forming a layer of metallic copper on copper oxide
Assignee: Individual
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Filing: 1951-10-22
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Granted: 1953-06-23
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Expires: 1971-10-22
Abstract
No abstract record available.
Inventors
- 👤 Hersch Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:07
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/01; H10D48/07; H10D48/071; H10D48/076; H10P; H10P14/00; H10P14/20; H10P14/203; H10P14/34; H10P14/3402; H10P14/3434
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
A PROCESS OF TREATING A COPPER OXIDE COATING CARRIED UPON A SOLID BASE, WHICH COMPRISES REDUCING THE SURFACE PORTION OF SAID COPPER OXIDE COATING TO METALLIC COPPER BY IMMERSING SAID BASE CARRYING SAID COATING IN A LIQUID AQUEOUS SOLUTION OF FORMALDEHYDE CONTAINING A FREE ALKALI UNTIL THE SURFACE PORTION OF SAID COPPER OXIDE COATING HAS BEEN REDUCED TO METALLIC COPPER, SUCH AQUEOUS SOLUTION BEING AT NOT SUBSTANTIALLY ABOVE ATMOSPHERIC TEMPERATURE.
Claim 2
Dependent Claim
70 words
A PROCESS OF TREATING A COPPER OXIDE COATING CARRIED UPON A SOLID BASE, WHICH COMPRISES REDUCING THE SURFACE PORTION OF SAID COPPER OXIDE COATING TO METALLIC COPPER BY IMMERSING SAID BASE CARRYING SAID COATING IN A LIQUID AQUEOUS SOLUTION OF FORMALDEHYDE CONTAINING A FREE ALKALI UNTIL THE SURFACE PORTION OF SAID COPPER OXIDE COATING HAS BEEN REDUCED TO METALLIC COPPER, SUCH AQUEOUS SOLUTION BEING AT NOT SUBSTANTIALLY ABOVE ATMOSPHERIC TEMPERATURE.
Claim 3
Dependent Claim
50 words
IN THE REDUCTION OF THE SURFACE PORTION OF AN ARTICLE WHICH COMPRISES A SOLID BASE CARRYING A COATING OF COPPER OXIDE, THE IMPROVEMENT WHICH CONSISTS IN FIRST IMMERSING SAID ARTICLE IN A DILUTE SOLUTION OF A SILVER COMPOUND, AND FOLLOWING THIS BY THE PROCESS AS SET FORTH IN CLAIM 1.
References Cited (Backward Citations)
US1905724A
Cited
US1746867A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |