US2908557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of etching copper
Assignee: RCA Corp
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Filing: 1957-01-07
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Granted: 1959-10-13
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Expires: 1977-01-07
Abstract
No abstract record available.
Inventors
- 👤 Otis D Black
- 👤 Leonard H Cutler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/02; C23F1/10; C23F1/14; C23F1/16; C23F1/18; C23G; C23G1/00; C23G1/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
THE METHOD OF REMOVING COPPER FROM A BASE MEMBER COMPRISING THE STEPS OF: PREPARING AN ETCHING SOLUTION CONSISTING ESSENTIALLY OF FROM 100 TO 300 GRAMS OF CUPRIC CHLORIDE AND AN AVAILABLE HYDROGEN ION CONCENTRATION OF FROM ABOUT 3 TO ABOUT 5 GRAMS PER LITER OF WATER, IMMERSING SAID BASE MEMBER INTO SAID SOLUTION IN THE PRESENCE OF AN OXIDZING AGENT UNTIL SAID COPPER IS REMOVED THEREFROM, AND CONSTANTLY REGENERATING SAID SOLUTION AS NEEDED BY ADDING MORE WATAER AND A SUBSTANCE WHICH FORMS HYDROGEN IONS TO SAID SOLUTION AS NEEDED TO MAINTAIN THE CONCENTRATION OF SAID CUPRIC CHLORIDE AND SAID HYDROGEN IONS IS SAID SOLUTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |