US4136225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cover coatings for printed circuits
Assignee: AT&T Inc
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Filing: 1977-07-08
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Granted: 1979-01-23
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Expires: 1997-07-08
Abstract
Abstract A flame retardant, flexible, solder resistant covercoat has been formulated based on dichloropropyl acrylate.
Inventors
- 👤 Eugene D. Feit
- 👤 Marguerite E. Wurtz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:14
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/224; H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/285; H05K3/287; H05K1/00; H05K1/02; H05K1/03; H05K1/0393; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
An electrical circuit comprising a flexible substrate a conductive pattern formed on the substrate and a protective coating covering portions of the conductive pattern the invention characterized in that the protective coating comprises a polymer of dichloropropyl acrylate crosslinked with an acrylic crosslinking agent in a weight ratio of 2:1 to 6:1 to yield a flexible coating.
Claim 2
Dependent Claim
57 words
An electrical circuit comprising a flexible substrate a conductive pattern formed on the substrate and a protective coating covering portions of the conductive pattern the invention characterized in that the protective coating comprises a polymer of dichloropropyl acrylate crosslinked with an acrylic crosslinking agent in a weight ratio of 2:1 to 6:1 to yield a flexible coating.
Claim 3
Dependent Claim
18 words
The electrical circuit of claim 1 in which the coating contains a UV sensitizer for photocuring the film.
Claim 4
Dependent Claim
12 words
The electrical circuit of claim 1 in which the coating is patterned.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |