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US4062740A
Expired / Lapsed
US
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Bath for direct chrome-plating of calender rolls
Assignee: Individual
•
Filing: 1977-01-14
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Granted: 1977-12-13
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Expires: 1997-01-14
Abstract
Abstract An electrolytic bath for direct chrome-plating of calender rolls is disclosed to which potassium aluminum sulfate and copper sulfate are added in order to increase the strength and stability of the chrome-plated layer deposited on the calender rolls.
Inventors
- 👤 Wilhelm Bauer
- 👤 Hans Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:45
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
55 words
A bath for direct chrome-plating of calender rolls, consisting of an aqueous solution containing chromic acid (CrO 3 ), sulfuric acid (H 2 SO 4 ) and fluosilicic acid (H 2 SiF 6 ), wherein the improvement in said bath comprises: copper sulfate (CuSO 4 ) and potassium aluminum sulfate [KAl(SO 4 ) 2 ].
Claim 2
Dependent Claim
55 words
A bath for direct chrome-plating of calender rolls, consisting of an aqueous solution containing chromic acid (CrO 3 ), sulfuric acid (H 2 SO 4 ) and fluosilicic acid (H 2 SiF 6 ), wherein the improvement in said bath comprises: copper sulfate (CuSO 4 ) and potassium aluminum sulfate [KAl(SO 4 ) 2 ].
Claim 3
Dependent Claim
52 words
A bath for chrome-plating as defined in claim 1 wherein, the content of potassium aluminum sulfate in said bath ranges from about 0.3 to about 0.5 weight percent (wt.%) and the content of copper sulfate ranges up to about 0.1 weight percent (wt.%) of the contents of chromic acid of said bath.
Claim 4
Dependent Claim
43 words
A bath for chrome-plating as defined in claim 2 wherein, the amount of sulfuric acid in said bath is reduced to the extent to which SO 4 -- ions are present in said bath in said copper sulfate and said potassium aluminum sulfate.
Claim 5
Dependent Claim
43 words
A bath for chrome-plating as defined in claim 1 wherein, the amount of sulfuric acid in said bath is reduced to the extent to which SO 4 -- ions are present in said bath in said copper sulfate and said potassium aluminum sulfate.
References Cited (Backward Citations)
US2962428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |