US2940836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching
Assignee: Dow Chemical Co
•
Filing: 1956-07-31
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Granted: 1960-06-14
•
Expires: 1976-07-31
Abstract
No abstract record available.
Inventors
- 👤 Marvin H Fishaber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:50
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/42
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
AN ETCHING BATH COMPRISING (I) 2.5 TO 3.3 PERCENT BY VOLUME OF DIETHYLBENZENE AND AN AQUEOUS SOLUTION CONTAINING (II) 5.0 TO 11.0 PERCENT BY VOLUME OF NITRIC ACID, (III) 2.0 TO 10.0 GRAMS PER LITER OF SULFOSUCCINIC ACID ESTERS PREPARED FROM ALIPHATIC ALCOHOLS HAVING FROM 7 TO 9 CARBON ATOMS, AND (IV) SODIUM SULFATE IN AN AMOUNT SUCH THAT 0.03 TO 0.18 GRAMS OF SULFUR PER LITER RESULTS.
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) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |