US3788957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition of chromium
Assignee: International Lead Zinc Research Organization Inc
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Filing: 1972-10-02
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Granted: 1974-01-29
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Expires: 1992-10-02
Abstract
Abstract AN IMPROVED METHOD AND AN IMPROVED ELECTROLYTE SOLUTION FOR PROVIDING A CHROMIUM COATING ON A METAL SUBSTRATE. THE METAL COATINGS ARE PROVIDED BY ELECTRODEPOSITIONS FROM SOLUTIONS COMPRISING WATER, DIMETHYLFORMAMIDE, TRIVALENT CHROMIUM, HALIDE IONS, AMMONIUM IONS, AND A CATIONIC SURFACTANT SELECTED FROM THE GROUP CONSISTING OF TETRAALKYLAMMONIUM SALTS AND SUBSTITUTED IMIDAZOLINE.
Inventors
- 👤 I Christie
- 👤 J Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:56
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D3/06; C25D3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |