US3870618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium plating method
Assignee: M&T HARSHAW
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Filing: 1973-08-30
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Granted: 1975-03-11
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Expires: 1993-08-30
Abstract
Abstract This invention relates to a method of electroplating a bright protective chromium plate which comprises maintaining a chromium plating bath containing chromic acid and sulfate; maintaining an anode in said bath; passing through said bath a continuously moving continuous strip of thin-gauge metal; passing an electric current through said anode, said bath, and said cathode thereby electroplating a bright protective plate on said moving strip of thin-gauge metal whereby said strip of metal is maintained as cathode, the improvement comprising preventing ''''arc burns'''' by passing immediately and without rinsing said moving strip of metal, bearing at least some portion of the contents of said plating bath, from said bath, into contact with a cathodic contact roll outside of said bath, said contact roll, having a contact surface of a metal selected from the group consisting of cast iron, high carbon steel, and carbides each member of said group having a carbon content of at least about 0.7 percent by weight.
Inventors
- 👤 Jr Edgar J Seyb
- 👤 Richard E Woehrle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:28
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/04; C25D7/00; C25D7/06; C25D7/0614
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
IN A METHOD OF ELECTROPLATING A BRIGHT PROTECTIVE CHROMIUM PLATE WHICH COMPRISES MAINTAINING A CHROMIUM PLATING BATH CONTAINING CHROMIC ACID AND SULFATE; MAINTAINING AN ANODE IN SAID BATH; PASSING THROUGH SAID BATH CONTINUOUSLY MOVING CONTINUOUS STRIP OF THIN-GAUGE METAL; PASSING AN ELECTRIC CURRENT THROUGH SAID ANODE, SAID BATH, AND SAID CATHODE THEREBY ELECTROPLATING A BRIGHT PROTECTIVE PLATE ON SAID MOVING STRIP OF THIN-GAUGE METAL WHEREBY SAID STRIP OF METAL IS MAINTAINED AS CATHODE, THE IMPROVEMENT COMPRISING PREVENTING "ARC BURNS" BY PASSING IMMEDIATELY AND WITHOUT RINSING SAID MOVING STRIP OF METAL, BEARING AT LEAST SOME PORTION OF THE CONTENTS OF SAID PLATING BATH FROM SAID BATH INTO CONTACT WITH A CATHODIC CONTACT ROLL OUTSIDE OF SAID BATH WHICH HAS A CONTACT SURFACE OF SOLID CAST IRON HAVING A CARBON CONTENT OF ABOUT 2 TO 6 PERCENT BY WEIGHT.
Claim 2
Dependent Claim
137 words
IN A METHOD OF ELECTROPLATING A BRIGHT PROTECTIVE CHROMIUM PLATE WHICH COMPRISES MAINTAINING A CHROMIUM PLATING BATH CONTAINING CHROMIC ACID AND SULFATE; MAINTAINING AN ANODE IN SAID BATH; PASSING THROUGH SAID BATH CONTINUOUSLY MOVING CONTINUOUS STRIP OF THIN-GAUGE METAL; PASSING AN ELECTRIC CURRENT THROUGH SAID ANODE, SAID BATH, AND SAID CATHODE THEREBY ELECTROPLATING A BRIGHT PROTECTIVE PLATE ON SAID MOVING STRIP OF THIN-GAUGE METAL WHEREBY SAID STRIP OF METAL IS MAINTAINED AS CATHODE, THE IMPROVEMENT COMPRISING PREVENTING "ARC BURNS" BY PASSING IMMEDIATELY AND WITHOUT RINSING SAID MOVING STRIP OF METAL, BEARING AT LEAST SOME PORTION OF THE CONTENTS OF SAID PLATING BATH FROM SAID BATH INTO CONTACT WITH A CATHODIC CONTACT ROLL OUTSIDE OF SAID BATH WHICH HAS A CONTACT SURFACE OF SOLID CAST IRON HAVING A CARBON CONTENT OF ABOUT 2 TO 6 PERCENT BY WEIGHT.
Claim 3
Dependent Claim
137 words
In a method of electroplating a bright protective chromium plate which comprises maintaining a chromium plating bath containing chromic acid and sulfate; maintaining an anode in said bath; passing through said bath continuously moving continuous strip of thin-gauge metal; passing an electric current through said anode, said bath, and said cathode thereby electroplating a bright protective plate on said moving strip of thin-gauge metal whereby said strip of metal is maintained as cathode, the improvement comprising preventing ''''arc burns'''' by passing immediately and without rinsing said moving strip of metal, bearing at least some portion of the contents of said plating bath from said bath into contact with a cathodic contact roll outside of said bath which has a contact surface of solid cast iron having a carbon content of about 2 to 6 percent by weight.
Claim 4
Dependent Claim
137 words
In a method of electroplating a bright protective chromium plate which comprises maintaining a chromium plating bath containing chromic acid and sulfate; maintaining an anode in said bath; passing through said bath continuously moving continuous strip of thin-gauge metal; passing an electric current through said anode, said bath, and said cathode thereby electroplating a bright protective plate on said moving strip of thin-gauge metal whereby said strip of metal is maintained as cathode, the improvement comprising preventing ''''arc burns'''' by passing immediately and without rinsing said moving strip of metal, bearing at least some portion of the contents of said plating bath from said bath into contact with a cathodic contact roll outside of said bath which has a contact surface of solid cast iron having a carbon content of about 2 to 6 percent by weight.
References Cited (Backward Citations)
US2445675A
Cited
US2652461A
Cited
US2702320A
Cited
US2933438A
Cited
US3346466A
Cited
US3617455A
Cited
US3714016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |