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US4284712A
Expired / Lapsed
US
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Fabrication of video disc flyleads
Assignee: RCA Corp
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Filing: 1980-07-11
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Granted: 1981-08-18
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Expires: 2000-07-11
Abstract
Abstract Method for preparing a flylead from beryllium copper alloy sheet having one side include a solder layer pattern. The method includes the steps of age hardening the beryllium copper alloy sheet, laminating both sides of the sheet with a dry film photoresist, exposing the first side of the laminated alloy sheet to actinic radiation through a mask to record a first pattern comprising the flylead pattern, exposing the second side of the laminated alloy sheet to actinic radiation through a mask to record a second pattern comprising the solder layer pattern, developing the second pattern to expose the alloy sheet surface, electroplating the exposed alloy sheet surface with a solder, relaminating the electroplated second side, developing the first pattern, etching the first pattern into the alloy sheet and removing the remaining photoresist from both sides of the etched alloy sheet.
Inventors
- 👤 Edward A. James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:37
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G11; G11B; G11B9/00; G11B9/06; G11B9/07; G11B9/075
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A method for preparing a flylead from a beryllium copper alloy sheet having one side include a solder layer pattern comprising the steps of: (a) age hardening the beryllium copper alloy sheet; (b) laminating both sides of the alloy sheet with a dry film photoresist; (c) exposing the first side of the laminated alloy sheet to actinic radiation to record a first pattern comprising the flylead pattern; (d) exposing the second side of the laminated alloy sheet to actinic radiation to record a second pattern comprising the solder layer pattern; (e) developing the second pattern to expose the alloy sheet surface; (f) electroplating the exposed alloy sheet surface with a solder; (g) relaminating the electroplated alloy sheet second side; (h) developing the first pattern; (i) etching the first pattern into the alloy sheet; and (j) removing the remaining photoresist from both sides of the etched alloy sheet to obtain a flylead having one side include a solder layer pattern.
Claim 2
Independent Claim
159 words
A method for preparing a flylead from a beryllium copper alloy sheet having one side include a solder layer pattern comprising the steps of: (a) age hardening the beryllium copper alloy sheet; (b) laminating both sides of the alloy sheet with a dry film photoresist; (c) exposing the first side of the laminated alloy sheet to actinic radiation to record a first pattern comprising the flylead pattern; (d) exposing the second side of the laminated alloy sheet to actinic radiation to record a second pattern comprising the solder layer pattern; (e) developing the second pattern to expose the alloy sheet surface; (f) electroplating the exposed alloy sheet surface with a solder; (g) relaminating the electroplated alloy sheet second side; (h) developing the first pattern; (i) etching the first pattern into the alloy sheet; and (j) removing the remaining photoresist from both sides of the etched alloy sheet to obtain a flylead having one side include a solder layer pattern.
Claim 3
Dependent Claim
19 words
The method in accordance with claim 1 wherein the electroplated second side is relaminated with a dry film photoresist.
Claim 4
Dependent Claim
19 words
A method in accordance with claim 1 wherein the electroplating step employs a lead tin fluoboric acid aqueous solution.
Claim 5
Dependent Claim
17 words
A method in accordance with claim 1 wherein the etching step employs an aqueous ferric chloride solution.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 1 wherein the dry film photoresist is negative working.
References Cited (Backward Citations)
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |