US2679475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal blackening composition and method
Assignee: Individual
•
Filing: 1952-01-21
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Granted: 1954-05-25
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Expires: 1972-01-21
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Singler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:14
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/565; C25D3/562; C25D9/00; C25D9/04; C25D9/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A PROCESS OF BLACKENING A METAL SURFACE FROM THE CLASS CONSISTING OF STEEL, BRASS, COPPER, ALUMINUM, NICKEL AND CADMIUM COMPRISING IMMERSING THE METAL SURFACE IN A WATER BATH CONSISTING ESSENTIALLY OF PER GALLON OF WATER ABOUT 8 OZ. NICKEL CHLORIDE; ABOUT 4 OZ. AMMONIUM CHLORIDE; ABOUT 1 OZ. OF ROCHELLE SALT; ABOUT 3/4 OZ. OF ZINC CHLORIDE; ABOUT 2 OZ. OF SODIUM CHLORIDE; AND ABOUT 1/4 OZ. OF AMMONIUM, MOLYBDATE, AND PASSING A LOW VOLTAGE ELECTRICAL CURRENT THERETHROUGH WITH THE METAL AS THE CATHODE.
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) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |