US3242090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions for and methods of removing gold deposits by chemical action
Assignee: MacDermid Inc
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Filing: 1964-03-10
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Granted: 1966-03-22
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Expires: 1984-03-10
Abstract
No abstract record available.
Inventors
- 👤 John J Grunwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:36
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A COMPOSITION FOR SELECTIVELY STRIPPING PLATED GOLD DEPOSITS BY CHEMICAL ACTION IN AQUEOUS SOLUTION, WHICH CONSISTS ESSENTIALLY OF: (A) A WATER SOLUBLE COMPLEX METAL TETRACYANIDE SALT, THE CATION PORTION OF WHICH IS SELECTED FROM A GROUP CONSISTING OF SODIUM, POTASSIUM AND AMMONIUM, AND THE COMPLEXING METAL OF THE ANION PROTION OF WHICH IS SELECTED FROM A GROUP CONSISTING OF ZINC, CADIUM AND COPPER, SAID SALT BEING PESENT IN PROPORTION TO PROVIDE THE EQUIVALENT OF FROM 0.002 MOLE TO SATURATION OF THE COMPLEX METAL CYANIDE ANION PER LITER OF SOLUTION; AND (B) A NITRO-SUBSTITUTED AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF NITROBENZENE SUFLONIC ACID, NITROBENZOIC ACID AND THE WATER SOLUBLE SODIUM, POTASSIUM, AND AMMONIUM SALTS THEREOF, NITROANILINE, NITROCHLOROBENZENE, NITROPHENOL AND NITROBENZALDEHYDE, WHEREIN THE NITRO-SUBSTITUTED AROMATIC COMPOUND SELECTED DOES NOT PRODUCE AN INSOLUBLE COMPOUND IN SOLUTION WITH THE SELECTED COMPLEX METAL TETRACYANIDE, SAID NITRO-SUBSTITUTED AROMATIC COMPOUND BEING PRESENT IN PROPORTION TO PROVIDE THE EQUIVALENT OF FROM 0.001 MOL TO SATURATION PER LITER OF SOLUTION.
Claim 2
Dependent Claim
163 words
A COMPOSITION FOR SELECTIVELY STRIPPING PLATED GOLD DEPOSITS BY CHEMICAL ACTION IN AQUEOUS SOLUTION, WHICH CONSISTS ESSENTIALLY OF: (A) A WATER SOLUBLE COMPLEX METAL TETRACYANIDE SALT, THE CATION PORTION OF WHICH IS SELECTED FROM A GROUP CONSISTING OF SODIUM, POTASSIUM AND AMMONIUM, AND THE COMPLEXING METAL OF THE ANION PROTION OF WHICH IS SELECTED FROM A GROUP CONSISTING OF ZINC, CADIUM AND COPPER, SAID SALT BEING PESENT IN PROPORTION TO PROVIDE THE EQUIVALENT OF FROM 0.002 MOLE TO SATURATION OF THE COMPLEX METAL CYANIDE ANION PER LITER OF SOLUTION; AND (B) A NITRO-SUBSTITUTED AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF NITROBENZENE SUFLONIC ACID, NITROBENZOIC ACID AND THE WATER SOLUBLE SODIUM, POTASSIUM, AND AMMONIUM SALTS THEREOF, NITROANILINE, NITROCHLOROBENZENE, NITROPHENOL AND NITROBENZALDEHYDE, WHEREIN THE NITRO-SUBSTITUTED AROMATIC COMPOUND SELECTED DOES NOT PRODUCE AN INSOLUBLE COMPOUND IN SOLUTION WITH THE SELECTED COMPLEX METAL TETRACYANIDE, SAID NITRO-SUBSTITUTED AROMATIC COMPOUND BEING PRESENT IN PROPORTION TO PROVIDE THE EQUIVALENT OF FROM 0.001 MOL TO SATURATION PER LITER OF 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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |