US2836550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of chromium plating aluminum
Assignee: Chemical Res Corp
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Filing: 1955-10-24
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Granted: 1958-05-27
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Expires: 1975-10-24
Abstract
No abstract record available.
Inventors
- 👤 Maclean William Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:12
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34; C25D5/42; C25D5/44; C25D21/00; C25D21/02; C25D3/00; C25D3/02; C25D3/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
THE METHOD OF ELECTRODEPOSITING CHROMIUM DIRECTLY UPON A METAL SELECTED FROM THE GROUP CONSISTING OF ALUMINUM AND ALUMINUM BASED ALLOY PRODUCTS TO DEPOSIT A CONTINUOUS, CONSISTENT, HIGHLY DUCTILE AND EASILY BUFFED PLATE AND ONE THAT REMAINS CRACK FREE UPON BENDING OF THE FINISHED PRODUCTS, WHICH COMPRISES PROVIDING AN ELECTROLYTIC BATH CONSISTING ESSENTIALLY OF CHROMIC ACID AND THE SULPHATE RADICAL, IMMERSING THE ARTICLES TO BE PLATED IN SAID AQUEOUS SOLUTION OF CHROMIC ACID AND THE SULPHATE RADICAL, ELECTROLYZING THE SOLUTION UNDER A CURRENT DENSITY OF 0.4 TO 0.9 AMPERE PER SQUARE INCH OF SURFASCE TO BE PLATED AND MAINTAINING SAID SOLUTION AT A MAXIMUM TEMPERATURE NOT OVER 50*F. THROUGH CONTROLLED COOLING MEANS AND THROUGHOUT THE ENTIRE CYCLE USED TO CHROMIUM PLATE SAID ALUMINUM AND ALUMINUM BASE ALLOY PRODUCTS.
References Cited (Backward Citations)
US2091386A
Cited
US2739932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |