US4082632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of perforated metal foil
Assignee: Huntington Alloys Corp
•
Filing: 1977-04-21
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Granted: 1978-04-04
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Expires: 1997-04-21
Abstract
Abstract Continuous lengths of metal foil, such as 4 micron thick nickel foil stored in coils, are perforated by anodic etching through a perforated titanium mask while foil and mask are simultaneously moving together through electrolytic etching bath.
Inventors
- 👤 John Edward Whittle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:02
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/70; C; C25; C25F; C25F3/00; C25F3/02; C25F3/14; C25F7/00; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A process for the production of a continuous length of perforated metal foil comprising passing a continuous length of foil through an electrolytic etching bath wherein one face of the foil contacts a surface which is inert with respect to the electrolyte and the other face of the foil is in contact with an endless perforated titanium mask simultaneously moving together with the foil while in the bath, and applying a potential difference of up to 10 volts across the foil and a cathode immersed in the bath, whereby the portions of the foil exposed to the bath through the perforated mask are anodically etched away.
Claim 2
Dependent Claim
106 words
A process for the production of a continuous length of perforated metal foil comprising passing a continuous length of foil through an electrolytic etching bath wherein one face of the foil contacts a surface which is inert with respect to the electrolyte and the other face of the foil is in contact with an endless perforated titanium mask simultaneously moving together with the foil while in the bath, and applying a potential difference of up to 10 volts across the foil and a cathode immersed in the bath, whereby the portions of the foil exposed to the bath through the perforated mask are anodically etched away.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1 wherein the metal of the foil is from the group consisting of nickel, copper, iron and alloys based thereon.
Claim 4
Dependent Claim
38 words
A process as set forth in calim 1 wherein the foil is passed along the surface of a large diameter roll and is in contact with the roll on at least 50% of the circumference of the roll.
Claim 5
Dependent Claim
38 words
A process as set forth in calim 1 wherein the foil is passed along the surface of a large diameter roll and is in contact with the roll on at least 50% of the circumference of the roll.
Claim 6
Dependent Claim
30 words
A process as set forth in claim 1 wherein nickel foil is perforated in a chloride bath at pH of 1 to 7 and the solution is maintained in agitation.
Claim 7
Dependent Claim
27 words
A process as set forth in claim 4 wherein the electrolyte is agitated by forced circulation and the pH of the electrolyte is between 4 and 6.
Claim 8
Dependent Claim
19 words
A process as set forth in claim 1 wherein the current density is maintained at about 600A/dm 2 .
Claim 9
Dependent Claim
26 words
A process as set forth in claim 1 wherein the perforated foil is subsequently washed and dried and then cooled by air jets to prevent creasing.
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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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |