US3322673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for and method of dissolving copper and copper alloys by chemical action
Assignee: MacDermid Inc
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Filing: 1964-04-01
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Granted: 1967-05-30
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Expires: 1984-04-01
Abstract
No abstract record available.
Inventors
- 👤 Leo J Slominski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:33
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A SOLUTION FOR DISSOLVING COPPER AND PREDOMINANTLY COPPER-BASE ALLOYS FREE OF SUBSTANTIAL AMOUNTS OF GOLD, NICKEL, AND ALLOYS OF TIN, CONSISTING ESSENTIALLY OF A MIXTURE OF CHROMIC AND SULFURIC ACIDS, WHEREIN THE CONCENTRATION OF CHROMIC ACID IS FROM ABOUT 0.5 TO 10.0 MOLS PER LITER AND THE NORMALITY OF THE SULFURIC ACID IS FROM ABOUT 0.5 TO 10.0, AND A COMPOUND PROVIDING A SMALL BUT EFFECTIVE AMOUNT OF IODATE IONS IN SOLUTION TO CATALYZE THE DISSOLUTION OF THE METAL.
Claim 2
Dependent Claim
79 words
A SOLUTION FOR DISSOLVING COPPER AND PREDOMINANTLY COPPER-BASE ALLOYS FREE OF SUBSTANTIAL AMOUNTS OF GOLD, NICKEL, AND ALLOYS OF TIN, CONSISTING ESSENTIALLY OF A MIXTURE OF CHROMIC AND SULFURIC ACIDS, WHEREIN THE CONCENTRATION OF CHROMIC ACID IS FROM ABOUT 0.5 TO 10.0 MOLS PER LITER AND THE NORMALITY OF THE SULFURIC ACID IS FROM ABOUT 0.5 TO 10.0, AND A COMPOUND PROVIDING A SMALL BUT EFFECTIVE AMOUNT OF IODATE IONS IN SOLUTION TO CATALYZE THE DISSOLUTION OF THE METAL.
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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) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |