Patent US2824829A successfully refreshed from Google Patents.
US2824829A
Expired / Lapsed
US
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Electrodepositing black chromiumvanadium coatings and members therewith
Assignee: Westinghouse Electric Corp
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Filing: 1956-06-08
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Granted: 1958-02-25
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Expires: 1976-06-08
Abstract
No abstract record available.
Inventors
- 👤 Martin F Quaely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:26
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D9/00; C25D9/04; C25D9/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN THE PROCESS OF ELECTRODEPOSITING AN ADHERENT HIGHLY HEAT-RESISTANT BLACK FINISH ON A MEMBER, THE STEP COMPRISING MAKING THE MEMBER A CATHODE IN AN AQUEOUS ELECTROPLATING ELECTROLYTE COMPRISING ESSENT IALLY FROM 150 TO 385 GRAMS PER LITER OF CHROMIC ACID, FROM 1.8 TO 10 GRAMS PER LITER OF VANADIUM IN SOLUBLE COMPOUND FORM, THERE BEING PRESENT FROM 100 TO 9.5 PARTS BY WEIGHT OF CHROMIUM PER PART OF VANADIUM, AND FROM 3 TO 20 GRAMS PER LITER OF A WATER SOLUBLE CARBOXYLIC ACID, AND PASSING A PLATING ELECTRICAL CURRENT THROUGH THE MEMBER AT A CURRENT DENSITY OF FROM 400 TO 2,000 AMPERES PER SQUARE FOOT, THE ELECTROLYTE BEING MAINTAINED AT A TEMPERATURE OF FROM 30* C. TO 50* C.
Claim 2
Dependent Claim
76 words
A MEMBER HAVING ON ITSS SURFACE AN ADHERENT, HIGHLY HEAT RESISTAANT, BLACK COATING CONSISTING OF CHROMIUM, VANADIUM AND OXYGEN, THE VANADIUM BEING PRESENT PRIMARILY AS VANADIUM TRIOXIDE AND THE CHROMIUM PRIMARILY AS METALLIC CHROMIUM WITH A MINOR PROPORTION OF CHROMIUM OXIDE, THERE BEING A TOTAL OF FROM 100 TO 2 ATOMS OF CHROMIUM PER ATOM OF OXYGEN COMBINED THERE WITH, AND FROM 100 TO 9.5 PARTS BY WEIGHT OF CHROMIUM PER PART BY WEIGHT OF VANADIUM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |