US3720596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the hard-chrome plating of large metallic surfaces
Assignee: INST CERCETARI TECHNOLOGICE PE
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Filing: 1970-06-15
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Granted: 1973-03-13
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Expires: 1990-06-15
Abstract
Abstract An apparatus for the hard-chromium plating elongated bodies of large surface area wherein the body is advanced in stages through the chromium plating bath relative to the anode, and chromium plating is carried out during the transverse in which the substrate is stationary. A pair of equipotential screens is provided in axially spaced relationship at each end of the plating zone, at least one of the screens being positioned upon the previously coated portion of the substrate at a location in which the prior plating has reached its maximum thickness.
Inventors
- 👤 A Draghicescu
- 👤 A Radoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:19
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/08; C25D17/00; C25D17/008; C25D7/00; C25D3/00; C25D3/02; C25D3/04; Y; Y10; Y10S; Y10S204/00; Y10S204/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
An apparatus for the hard-chromium plating of large elongated metallic bodies, comprising: a tank having a pair of longitudinally spaced end walls provided with axially aligned openings adapted to receive an elongated generally cylindrical body forming a metallic surface to be plated and of a length in excess of that of said tank; sealing means at each of said openings hugging said body while enabling same to be advanced in increments through said tank; a generally cylindrical anode received in said tank and surrounding said body, said anode having a configuration geometrically similar to the cross-section of said body and a pair of conductive shields mounted on said body and spaced from said anode on either Side thereof, said shields each comprising a nonconductive ring hugging said body and an annular metal band mounted on said ring; and circuit means for cathodically energizing said body and anodically energizing said anode to effect electroplating of the portion of the body surrounded by said anode between said shields.
Claim 2
Independent Claim
166 words
An apparatus for the hard-chromium plating of large elongated metallic bodies, comprising: a tank having a pair of longitudinally spaced end walls provided with axially aligned openings adapted to receive an elongated generally cylindrical body forming a metallic surface to be plated and of a length in excess of that of said tank; sealing means at each of said openings hugging said body while enabling same to be advanced in increments through said tank; a generally cylindrical anode received in said tank and surrounding said body, said anode having a configuration geometrically similar to the cross-section of said body and a pair of conductive shields mounted on said body and spaced from said anode on either Side thereof, said shields each comprising a nonconductive ring hugging said body and an annular metal band mounted on said ring; and circuit means for cathodically energizing said body and anodically energizing said anode to effect electroplating of the portion of the body surrounded by said anode between said shields.
Claim 3
Independent Claim
166 words
An apparatus for the hard-chromium plating of large elongated metallic bodies, comprising: a tank having a pair of longitudinally spaced end walls provided with axially aligned openings adapted to receive an elongated generally cylindrical body forming a metallic surface to be plated and of a length in excess of that of said tank; sealing means at each of said openings hugging said body while enabling same to be advanced in increments through said tank; a generally cylindrical anode received in said tank and surrounding said body, said anode having a configuration geometrically similar to the cross-section of said body and a pair of conductive shields mounted on said body and spaced from said anode on either Side thereof, said shields each comprising a nonconductive ring hugging said body and an annular metal band mounted on said ring; and circuit means for cathodically energizing said body and anodically energizing said anode to effect electroplating of the portion of the body surrounded by said anode between said shields.
Claim 4
Independent Claim
166 words
An apparatus for the hard-chromium plating of large elongated metallic bodies, comprising: a tank having a pair of longitudinally spaced end walls provided with axially aligned openings adapted to receive an elongated generally cylindrical body forming a metallic surface to be plated and of a length in excess of that of said tank; sealing means at each of said openings hugging said body while enabling same to be advanced in increments through said tank; a generally cylindrical anode received in said tank and surrounding said body, said anode having a configuration geometrically similar to the cross-section of said body and a pair of conductive shields mounted on said body and spaced from said anode on either Side thereof, said shields each comprising a nonconductive ring hugging said body and an annular metal band mounted on said ring; and circuit means for cathodically energizing said body and anodically energizing said anode to effect electroplating of the portion of the body surrounded by said anode between said shields.
Claim 5
Dependent Claim
100 words
The apparatus defined in claim 1 wherein said anode is a perforated sleeve surrounding said body over a distance ranging from 100 to 150 mm and is provided with staggered longitudinal arrays of apertures having diameters ranging from 5 to 10 mm such that the surface area of the anode confronting said body has a ratio to the surface area of the body juxtaposed therewith ranging from 2:1 to 1:1, said shields being positioned at distances of 40 to 60 mm from said anode, said circuit means including polarity-reversing means for anodizing the surface of said body against said anode.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |