Patent US4389279A successfully refreshed from Google Patents.
US4389279A
Expired / Lapsed
US
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Method of etching apertures into a continuous moving metallic strip
Assignee: RCA Licensing Corp
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Filing: 1982-06-23
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Granted: 1983-06-21
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Expires: 2002-06-23
Abstract
Abstract A method of etching a continuous etchable metallic strip from both major surfaces to produce a multiplicity of apertures therethrough, said strip having, on both major surfaces, acid-resistant stencils with openings therein that are registered with one another. The method comprises moving the strip through an etching chamber, spraying liquid etchant toward both of said major surfaces and shielding one of the major surfaces from sprayed liquid etchant during the initial portion of the spraying step. Shielding is achieved by interposing a stationary wall opposite to and spaced from the shielded surface and providing continuous side seals between the wall and the edge portions of the strip.
Inventors
- 👤 Donald M. Weber
- 👤 Raymond A. Alleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:49
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
In a method of etching a continuous etchable metallic strip from both major surfaces thereof to produce a multiplicity of apertures therethrough, said strip having a first acid-resistant stencil on one major surface thereof and a second acid-resistant stencil on the other major surface thereof, said first and second stencils having openings therein that are registered one with the other, said method including the steps of: (a) moving said strip through an etching chamber, (b) spraying liquid etchant in said chamber toward both of said major surfaces and (c) shielding one of said major surfaces from exposure to said sprayed liquid etchant during the initial portion of said spraying step, the improvement wherein said shielding is achieved by interposing a stationary wall opposite and spaced from said shielded surface and providing continuous side seals between said stationary wall and the edge portions of said moving strip, said strip and said wall defining a shielding chamber for said strip.
Claim 2
Dependent Claim
158 words
In a method of etching a continuous etchable metallic strip from both major surfaces thereof to produce a multiplicity of apertures therethrough, said strip having a first acid-resistant stencil on one major surface thereof and a second acid-resistant stencil on the other major surface thereof, said first and second stencils having openings therein that are registered one with the other, said method including the steps of: (a) moving said strip through an etching chamber, (b) spraying liquid etchant in said chamber toward both of said major surfaces and (c) shielding one of said major surfaces from exposure to said sprayed liquid etchant during the initial portion of said spraying step, the improvement wherein said shielding is achieved by interposing a stationary wall opposite and spaced from said shielded surface and providing continuous side seals between said stationary wall and the edge portions of said moving strip, said strip and said wall defining a shielding chamber for said strip.
Claim 3
Dependent Claim
18 words
The method defined in claim 1 wherein said wall is rigid and is constituted of a solid material.
Claim 4
Dependent Claim
58 words
The method defined in claim 1 wherein each of said side seals comprises a U-shaped groove around and closely spaced from the edge portion of both major surfaces of said strip, the walls of said groove and said edge portions of said strip defining a relatively long, narrow nonlinear path between said shielding chamber and said etching chamber.
Claim 5
Dependent Claim
29 words
The method defined in claim 1 including an end seal across said strip between said shielding chamber and said etching chamber at the exit end of said shielding chamber.
Claim 6
Dependent Claim
21 words
The method defined in claim 4 wherein the gas pressure is higher in said shielding chamber than in said etching chamber.
Claim 7
Dependent Claim
16 words
The method defined in claim 1 wherein said major surfaces are oriented in a vertical direction.
Claim 8
Dependent Claim
16 words
The method defined in claim 1 wherein said major surfaces are oriented in a horizontal direction.
Claim 9
Dependent Claim
30 words
The method defined in claim 7 wherein said one major surface faces up, and said other major surface faces down, and said wall is spaced above said one major surface.
Claim 10
Dependent Claim
36 words
The method defined in claim 8 wherein the openings in said first stencil are smaller than the thickness of said strip, and the openings in said second stencil are larger than the thickness of said strip.
Claim 11
Dependent Claim
33 words
The method defined in claim 1 wherein the positions of said stationary wall and said side seals can be adjusted in the direction, and opposite to the direction, of movement of said strip.
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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) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |