US2698781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accelerating action of acids on metals
Assignee: MacDermid Enthone Inc
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Filing: 1953-04-27
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Granted: 1955-01-04
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Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 Walter R Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:02
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/44; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/081; C23G1/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
THE PROCESS OF DISSOLVING METALS HIGHER THAN HYDROGEN IN THE ELECTROMOTIVE SERIES OF METALS WHICH INCLUDES THE STEP OF TREATING THE METAL WITH AN AQUEOUS STRONG ACID SOLUTION CONTAINING A NITRO-AROMATIC COMPOUND HAVING A POTENTIAL GREATER THAN -0.90 VOLT MEASURED BETWEEN A SHEET-NICKEL ELECTRODE AND A SATURATED POTASSIUM CHLORIDE CALOMEL ELECTRODE UNDER THE FOLLOWING CONDITIONS: TEMPERTURE 80* PLUS OR MINUS 1*C.; PH BETWEEN 8 AND 13; SODIUM CYANIDE CONCENTRATION APPROXIMATELY 2 MOLAR AND THE CONCENTRATION OF THE NITRO-COMPOUND AT ITS SATURATION VALUE OR ABOUT 0.25 GRAM-MOL PER LITER OF SOLUTION, WHICHEVER IS THE SMALLER.
Claim 2
Dependent Claim
94 words
THE PROCESS OF DISSOLVING METALS HIGHER THAN HYDROGEN IN THE ELECTROMOTIVE SERIES OF METALS WHICH INCLUDES THE STEP OF TREATING THE METAL WITH AN AQUEOUS STRONG ACID SOLUTION CONTAINING A NITRO-AROMATIC COMPOUND HAVING A POTENTIAL GREATER THAN -0.90 VOLT MEASURED BETWEEN A SHEET-NICKEL ELECTRODE AND A SATURATED POTASSIUM CHLORIDE CALOMEL ELECTRODE UNDER THE FOLLOWING CONDITIONS: TEMPERTURE 80* PLUS OR MINUS 1*C.; PH BETWEEN 8 AND 13; SODIUM CYANIDE CONCENTRATION APPROXIMATELY 2 MOLAR AND THE CONCENTRATION OF THE NITRO-COMPOUND AT ITS SATURATION VALUE OR ABOUT 0.25 GRAM-MOL PER LITER OF SOLUTION, WHICHEVER IS THE SMALLER.
References Cited (Backward Citations)
US2033444A
Cited
US2378052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |