US3351555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromic acid-sulfuric acid solutions containing a mercuric ion catalyst for dissolving of copper and its alloys
Assignee: Honeywell International Inc
•
Filing: 1965-10-21
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Granted: 1967-11-07
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Robert D Byers
- 👤 John G Poor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:28
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/04; C23F3/06; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
AN AQUEOUS SOLUTION FOR ETCHING COPPER AND ITS OXIDES CONSISTING ESSENTIALLY OF BETWEEN 70 TO 170 GRAMS PER LITER CHROMIC ACID AND 150 TO 100 GRAMS PR LITER SULFURIC ACID AND HAVING INCORPORATED THEREIN A CATALYTIC AMOUNT OF MERCURIC IONS.
Claim 2
Dependent Claim
40 words
AN AQUEOUS SOLUTION FOR ETCHING COPPER AND ITS OXIDES CONSISTING ESSENTIALLY OF BETWEEN 70 TO 170 GRAMS PER LITER CHROMIC ACID AND 150 TO 100 GRAMS PR LITER SULFURIC ACID AND HAVING INCORPORATED THEREIN A CATALYTIC AMOUNT OF MERCURIC IONS.
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) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |