US2640767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching
Assignee: Dow Chemical Co
•
Filing: 1951-02-12
•
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
2026-10-27 07:36
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
AN ETCHING BATH COMPRISING A MIXTURE OF A PETROLEUM SULFONATE HAVING FROM 18 TO 30 CARBON ATOMS, A LIQUID PETROLEUM FRACTION BOILING IN THE RANGE OF 90* TO 390* C., AND AN AQUEOUS SOLUTION CONTAINING FROM 3 TO 25 PER CENT OF HNO3 BY WEIGHT, THE AMOUNT OF THE PETROLEUM SULFONATE BEING FROM 0.01 TO 0.2 OF THAT OF THE HNO3 IN THE AQUEOUS SOLUTION, AND THE WEIGHT OF THE LIQUID PETROLEUM FRACTION BEING AT LEAST 1.3 TIMES THE WEIGHT OF THE PETROLEUM SULFONATE BUT NOT MORE THAN 0.15 OF THE WEIGHT OF THE AQUEOUS NITRIC ACID SOLUTION.
Claim 2
Dependent Claim
98 words
AN ETCHING BATH COMPRISING A MIXTURE OF A PETROLEUM SULFONATE HAVING FROM 18 TO 30 CARBON ATOMS, A LIQUID PETROLEUM FRACTION BOILING IN THE RANGE OF 90* TO 390* C., AND AN AQUEOUS SOLUTION CONTAINING FROM 3 TO 25 PER CENT OF HNO3 BY WEIGHT, THE AMOUNT OF THE PETROLEUM SULFONATE BEING FROM 0.01 TO 0.2 OF THAT OF THE HNO3 IN THE AQUEOUS SOLUTION, AND THE WEIGHT OF THE LIQUID PETROLEUM FRACTION BEING AT LEAST 1.3 TIMES THE WEIGHT OF THE PETROLEUM SULFONATE BUT NOT MORE THAN 0.15 OF THE WEIGHT OF 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 |