US3753872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and bath for producing microcrack chromium coatings
Assignee: Langbein Pfanhauser Werke AG
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Filing: 1972-01-10
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Granted: 1973-08-21
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Expires: 1992-01-10
Abstract
Abstract A MICROCRACK CHROMIUM COATING IS APPLIED BY ELECTROPLATING IT UPON A COATING OF KICKEL, COLBALT NICKEL-COLBALT NICKEL-IRON OF IRON-COLBALT PEVIOUSLY ELCTRODEPOSITED UPON A SUBSTRATE, E.G., OF STEEL, FROM AN ELECCTROPLATENG BATH CONTAINING 5 G./LITER TO LIMIT OF SOLUBILITY OF AT LEAST ONE AROMATIC MONO-, DI- OR POLYCARBOXYLIC ACID AMYHDRIDE OR SALT. PREFERABLY THE AROMATIC CARBOXYLIC ACID IS BENZOIC ACID, PHTALIC ACID OR PHENYLACTIC ACID AND IS PRESENT IN AN AMOUNT OF 5 G./LITER TO 70 G./LITER OR THE LIMIT OF SOLUBILITY WHICHEVER IS LESS, THE ELECTROPLATING IS CARRIED OUT A TEMPERATURE OF 35 TO 70*C. AND THE CURRENT DENSITY OF 3 TO 20 A./DM.2.
Inventors
- 👤 M Koehl
- 👤 R Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:12
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/10; C25D5/12; C25D5/14; C25D3/00; C25D3/02; C25D3/12; C25D5/60; C25D5/625
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |