Patent US4227986A successfully refreshed from Google Patents.
US4227986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for providing a surface coating on the wall in a cavity by means of electrolytic plating
Assignee: Wave Energy Development I Vastmanland AB
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Filing: 1978-06-21
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Granted: 1980-10-14
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Expires: 1998-06-21
Abstract
Abstract A method and apparatus for providing a surface coating of a metal or metal alloy on the wall of an elongate cavity in a workpiece by means of electrolytic plating, the workpiece being used as cathode. An electrolyte containing ions of the metal intended for the coating is brought into movement inside the cavity with the aid of a conveyor, which consists of a resilient and electrically insulating material such as a perforated, net-like or fibrous strip, and which is wound helically round the anode. The strip is fringed or slit on the edge facing towards the cavity wall to form outstanding resilient fingers which are in contact with the cavity wall.
Inventors
- 👤 Kaj-Ragnar Loqvist
- 👤 Leif-Ake Bennstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:24
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/08; C25D5/04; C25D5/22; C25D5/60; C25D5/623; C25D7/00; C25D7/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
An apparatus for providing a surface coating of a metal or metal alloy on the wall of an elongate cavity workpiece by means of electrolytic plating, the workpiece being used as a cathode, characterized by at least one anode for placement longitudinally extending in the cavity of a workpiece, and at least one conveyor, comprising a resilient and electrically insulating material for transporting the electrolyte and gas produced during said plating, said material comprising at least one flexible, homogeneous, perforated, net-like or fibrous strip helically wound around the anode in its longitudinal direction, said helically wound strip having outstanding resilient fingers in contact with the wall of said cavity while the strip lies against the anode and being enabled to come into contact with every part of said surface while adjusting to the surface to be coated.
Claim 2
Independent Claim
137 words
An apparatus for providing a surface coating of a metal or metal alloy on the wall of an elongate cavity workpiece by means of electrolytic plating, the workpiece being used as a cathode, characterized by at least one anode for placement longitudinally extending in the cavity of a workpiece, and at least one conveyor, comprising a resilient and electrically insulating material for transporting the electrolyte and gas produced during said plating, said material comprising at least one flexible, homogeneous, perforated, net-like or fibrous strip helically wound around the anode in its longitudinal direction, said helically wound strip having outstanding resilient fingers in contact with the wall of said cavity while the strip lies against the anode and being enabled to come into contact with every part of said surface while adjusting to the surface to be coated.
Claim 3
Dependent Claim
51 words
Apparatus as claimed in claim 1, characterized in that the anode consists of an elongate means, movable in the cavity of the workpiece, preferably in the form of a red wire, tube or rope of metal on which the resilient and electrically insulating material transporting the electrolyte and gas is arranged.
Claim 4
Dependent Claim
15 words
Apparatus as claimed in claim 1, characterized in that the anode consists of stainless steel.
Claim 5
Dependent Claim
24 words
Apparatus as claimed in claim 1, characterized in that the anode has an internal core of a material with good electrical conductivity, e.g. copper.
Claim 6
Dependent Claim
20 words
Apparatus as claimed in claim 1, characterized in that the anode has a covering of metal on a copper core.
Claim 7
Dependent Claim
18 words
Apparatus as claimed in claim 1, characterized in that the anode has the form of a screw conveyor.
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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |