Patent US3661733A successfully refreshed from Google Patents.
US3661733A
Expired / Lapsed
US
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Chromium electroplating
Assignee: Individual
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Filing: 1969-07-02
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Granted: 1972-05-09
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Expires: 1989-07-02
Abstract
Abstract An improved electrolytically deposited chromium coating is provided having an improved mirror-like brightness using an aqueous solution in the nature of a Bornhauser solution and ions of the class consisting of hexafluoantimonate and hexafluostannate, as stable catalysts and brightening agents and within a critical content of about 0.7 to 4 percent with relation to the chromium trioxide content.
Inventors
- 👤 Wilhehm Roggendorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:14
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
A chromium plating electrolyte as defined in claim 1 wherein the aqueous solution contains sodium tetraChromate with a Molar ratio of chromium trioxide to sodium oxide of about 4.8 to 1 up to about 7 to 1.
References Cited (Backward Citations)
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FR1400157A
Cited
US3418220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |