US2640765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching
Assignee: Dow Chemical Co
•
Filing: 1951-02-12
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Granted: 1953-06-02
•
Expires: 1971-02-12
Abstract
No abstract record available.
Inventors
- 👤 John A Easley
- 👤 Harry E Swayze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:53
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
AN ETCHING BATH COMPRISING A MIXTURE OF AN AQUEOUS SOLUTION CONTAINING NITRIC ACID, AN ESTER OF SULFOSUCCINIC ACID AND AN ALIPHATIC ALCOHOL HAVING FROM 4 TO 12 CARBON ATOMS, AND A WATERIMMISCIBLE ORGANIC LIQUID SUBSTANTIALLY UNREACTIVE WITH THE AQUEOUS NITRIC ACID SOLUTION.
Claim 2
Dependent Claim
42 words
AN ETCHING BATH COMPRISING A MIXTURE OF AN AQUEOUS SOLUTION CONTAINING NITRIC ACID, AN ESTER OF SULFOSUCCINIC ACID AND AN ALIPHATIC ALCOHOL HAVING FROM 4 TO 12 CARBON ATOMS, AND A WATERIMMISCIBLE ORGANIC LIQUID SUBSTANTIALLY UNREACTIVE WITH THE AQUEOUS NITRIC ACID 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) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |