US2964453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching bath for copper and regeneration thereof
Assignee: AT&T Inc
•
Filing: 1957-10-28
•
Granted: 1960-12-13
•
Expires: 1977-10-28
Abstract
No abstract record available.
Inventors
- 👤 Paul D Garn
- 👤 Louis H Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:51
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/12; C23; C23F; C23F1/00; C23F1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A METHOD OF ETCHING COOPER IN A REGENERABLE THE ETCHING SOLUTION AND SIMULTANEOUSLY REGENERATING THE SAME SOLUTION IN THE SAME VESSEL WHICH COMPRISES ETCHING COPPER IN AN ETCHING BATH CONTAINING A METALLIC CHLORIDE CAPABLE OF BOTH BEING AN ETCHANT FOR COOPER AND GOING FROM THE OXIDATION STATE OF ITS EXHAUSTED CONDITION BACK TO THE OXIDIZED STATE OF ITS FRESH CONDITION AND AN EXCESS OF CHLORIDE IONS, AND SIMULTANEOUSLY ELECTROLYTICALLY REGENERATING THE SAME SOLUTION IN THE SAME VESSEL HAVING A CATHODE AND AN ANODE, SAID CATHODE HAVING A SURFACE AREA LSS THAN SAID ANODE SO THAT A CURRENT DESITY GRADIENT IS ESTABLISED BETWEEN THE CATHODE AND THE ANODE WHICH CAUSES CUPROUS AND CUPRIC IONS TO BE REDUCED TO COOPER AT THE CATHODE AND CUPROUS IONS TO BE OXIDIZED TO CUPRIC IONS AT THE ANODE WHICH, TOGETHER WITH THE CUPRIC IONS OF THE PLATING SOLUTIONS, ARE PHYSICALLY FREE TO MIGRATE TO THE CATHODE.
Claim 2
Independent Claim
151 words
A METHOD OF ETCHING COOPER IN A REGENERABLE THE ETCHING SOLUTION AND SIMULTANEOUSLY REGENERATING THE SAME SOLUTION IN THE SAME VESSEL WHICH COMPRISES ETCHING COPPER IN AN ETCHING BATH CONTAINING A METALLIC CHLORIDE CAPABLE OF BOTH BEING AN ETCHANT FOR COOPER AND GOING FROM THE OXIDATION STATE OF ITS EXHAUSTED CONDITION BACK TO THE OXIDIZED STATE OF ITS FRESH CONDITION AND AN EXCESS OF CHLORIDE IONS, AND SIMULTANEOUSLY ELECTROLYTICALLY REGENERATING THE SAME SOLUTION IN THE SAME VESSEL HAVING A CATHODE AND AN ANODE, SAID CATHODE HAVING A SURFACE AREA LSS THAN SAID ANODE SO THAT A CURRENT DESITY GRADIENT IS ESTABLISED BETWEEN THE CATHODE AND THE ANODE WHICH CAUSES CUPROUS AND CUPRIC IONS TO BE REDUCED TO COOPER AT THE CATHODE AND CUPROUS IONS TO BE OXIDIZED TO CUPRIC IONS AT THE ANODE WHICH, TOGETHER WITH THE CUPRIC IONS OF THE PLATING SOLUTIONS, ARE PHYSICALLY FREE TO MIGRATE TO THE CATHODE.
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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) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |