US2985567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeposition of black chromium coatings
Assignee: Honeywell International Inc
•
Filing: 1959-03-16
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Granted: 1961-05-23
•
Expires: 1979-03-16
Abstract
No abstract record available.
Inventors
- 👤 Pinkerton Henry Latta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:49
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
THE PROCESS OF ELECTRODEPOSITING AN ADHERENT BLACK CHROMIUM COATING ON AN ELECTRICALLY CONDUCTIVE MEMBER, WHICH PROCESS COMPRISES MAKING THE MEMBER A CATHODE IN AN AQUEOUS ELECTROPLATING SOLUTION CONSISTING ESSENTIALLY OF CHROMIC ACID IN AN AMOUNT OF AT LEAST 60 GRAMS PER LITER, AND A FLUORINE-BEARING CATALYST ION IN AMOUNT SUCH THAT THE RATIO OF CHROMIC ACID (CRO3) TO SAID FLUORINE-BEARING ION IS WITHIN THE RANGE OF FROM 125 PARTS BY WEIGHT OF CRO3 TO 1 PART OF FLUORINE-BEARING ION TO 4,000 PARTS OF CRO3 TO 1 PART OF FLUORINE-BEARING ION, SAID SOLUTION BEING SUBSTANTIALLY COMPLETELY FREE OF OTHER CATALYST IONS, AND PASSING A DIRECT CURRENT THROUGH THE MEMBER AT A CURRENT DENSITY OF FROM 75 TO 450 A.S.F. WHILE MAINTAINING THE TEMPERATURE OF SAID SOLUTION WITHIN THE RANGE OF FROM ABOUT 70*F. TO 100*F.
Claim 2
Dependent Claim
134 words
THE PROCESS OF ELECTRODEPOSITING AN ADHERENT BLACK CHROMIUM COATING ON AN ELECTRICALLY CONDUCTIVE MEMBER, WHICH PROCESS COMPRISES MAKING THE MEMBER A CATHODE IN AN AQUEOUS ELECTROPLATING SOLUTION CONSISTING ESSENTIALLY OF CHROMIC ACID IN AN AMOUNT OF AT LEAST 60 GRAMS PER LITER, AND A FLUORINE-BEARING CATALYST ION IN AMOUNT SUCH THAT THE RATIO OF CHROMIC ACID (CRO3) TO SAID FLUORINE-BEARING ION IS WITHIN THE RANGE OF FROM 125 PARTS BY WEIGHT OF CRO3 TO 1 PART OF FLUORINE-BEARING ION TO 4,000 PARTS OF CRO3 TO 1 PART OF FLUORINE-BEARING ION, SAID SOLUTION BEING SUBSTANTIALLY COMPLETELY FREE OF OTHER CATALYST IONS, AND PASSING A DIRECT CURRENT THROUGH THE MEMBER AT A CURRENT DENSITY OF FROM 75 TO 450 A.S.F. WHILE MAINTAINING THE TEMPERATURE OF SAID SOLUTION WITHIN THE RANGE OF FROM ABOUT 70*F. TO 100*F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |