US4421814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strippable resists
Assignee: AT&T Inc
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Filing: 1982-03-29
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Granted: 1983-12-20
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Expires: 2002-03-29
Abstract
Abstract A printed circuit board is formed from a metal-clad substrate by applying a solvent-free, non-dryable ink in a predetermined pattern on the substrate, dusting powdered resin over the surface, removing any resin powder not retained by the ink from the surface, heating the substrate having the ink powder thereon to a temperature so as to fuse the powdered resin to form a strippable resist, etching the uncoated portion of the metal laminate and stripping the resist subsequent to etching.
Inventors
- 👤 John R. Piazza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:37
CPC Classifications
B; B41; B41M; B41M7/00; B41M7/02; C; C23; C23F; C23F1/00; C23F1/02; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K2203/00; H05K2203/05; H05K2203/0502; H05K2203/0522; H05K2203/13; H05K2203/1333; H05K2203/1355; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A thermographic printed strippable resist comprises a hydrophobic combination of a solvent-free, tacky, non-dryable low molecular weight liquid resin ink fused with a compatible powdered resin wherein said ink is a primary plasticizer for said powdered resin and both said ink and said powdered resin are polyester polymers, and wherein said resist forms a raised pattern on a substrate and is resistant to attack by metal etching and plating solutions and to scratching.
Claim 2
Dependent Claim
73 words
A thermographic printed strippable resist comprises a hydrophobic combination of a solvent-free, tacky, non-dryable low molecular weight liquid resin ink fused with a compatible powdered resin wherein said ink is a primary plasticizer for said powdered resin and both said ink and said powdered resin are polyester polymers, and wherein said resist forms a raised pattern on a substrate and is resistant to attack by metal etching and plating solutions and to scratching.
Claim 3
Dependent Claim
74 words
An article of manufacture comprising a substrate having a thermographic printed, raised, strippable resist thereon wherein said resist comprises a hydrophobic combination of a solvent-free, non-dryable low molecular weight liquid resin ink fused with a compatible powdered resin wherein said ink is a primary plasticizer for said powdered resin and both said ink and said powdered resin are polyester polymers, and wherein said resist is resistant to attack by metal etching and plating solutions.
Claim 4
Dependent Claim
74 words
An article of manufacture comprising a substrate having a thermographic printed, raised, strippable resist thereon wherein said resist comprises a hydrophobic combination of a solvent-free, non-dryable low molecular weight liquid resin ink fused with a compatible powdered resin wherein said ink is a primary plasticizer for said powdered resin and both said ink and said powdered resin are polyester polymers, and wherein said resist is resistant to attack by metal etching and plating solutions.
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) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |