Patent US4725504A successfully refreshed from Google Patents.
US4725504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal coated laminate products made from textured polyimide film
Assignee: PARLEX USA Inc
•
Filing: 1987-02-24
•
Granted: 1988-02-16
•
Expires: 2007-02-24
Abstract
Abstract One or both surfaces of a uniformly and completely textured polyimide sheet are coated with a layer of electroless nickel or cobalt and a subsequent layer of electrolytically applied copper yielding an adhesiveless laminate useful in the production of electronic circuitry. The copper and nickel or cobalt layers are strongly bonded to the textured polyimide sheet to the extent that the laminate exceeds bond strength requirements as measured by current standard peel strength tests of the Institute for Interconnecting and Packaging Electronic Circuits (IPC) for both initial and post solder float adhesion.
Inventors
- 👤 Philip D. Knudsen
- 👤 Daniel P. Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:54
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/38; H05K3/381; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0344; H05K2203/00; H05K2203/12; H05K2203/122; H05K3/02; H05K3/022; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12708; Y10T428/12722; Y10T428/12771; Y10T428/12861; Y10T428/12882; Y10T428/12903; Y10T428/1291; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31721
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A polyimide laminate sheet product including as one layer of said laminate sheet product a polyimide sheet having two surfaces, each of said polyimide sheet surfaces being uniformly and substantially completely textured and each of said polyimide sheet surfaces being free of an adhesive and having a metal coating comprising an electroless nickel or cobalt coating and an electrolytic copper coating bonded to each of said nickel or cobalt coatings, said laminate sheet product having a peel strength of at least 6.0 lb./in. as measured by IPC test 2.4.9 Method A and a peel strength of at least 4.5 lb./in. as measured by IPC test 2.4.9 Method C and being capable of passing IPC test 2.4.13 for solder float.
Claim 2
Dependent Claim
119 words
A polyimide laminate sheet product including as one layer of said laminate sheet product a polyimide sheet having two surfaces, each of said polyimide sheet surfaces being uniformly and substantially completely textured and each of said polyimide sheet surfaces being free of an adhesive and having a metal coating comprising an electroless nickel or cobalt coating and an electrolytic copper coating bonded to each of said nickel or cobalt coatings, said laminate sheet product having a peel strength of at least 6.0 lb./in. as measured by IPC test 2.4.9 Method A and a peel strength of at least 4.5 lb./in. as measured by IPC test 2.4.9 Method C and being capable of passing IPC test 2.4.13 for solder float.
Claim 3
Dependent Claim
14 words
The product of claim 1 wherein said electroless coating is a nickel containing alloy.
Claim 4
Dependent Claim
18 words
The product of claim 1 where said electroless nickel or cobalt coating is at least 0.15 μm thick.
Claim 5
Dependent Claim
15 words
The product of claim 1 where said electroless metal coating comprises a cobalt containing alloy.
Claim 6
Dependent Claim
22 words
The product of any one of claims 1, 2, 3 or 4 wherein each of said metal coatings including copper is patterned.
Claim 7
Dependent Claim
164 words
A polyimide laminate sheet product including as one layer of said laminate sheet product a polyimide sheet having two surfaces, at least one of said polyimide sheet surfaces being uniformly and substantially completely textured and one of said polyimide sheet surfaces being uncoated or being uniformly and substantially completely textured and coated with an electroless nickel or cobalt coating, a second surface of said polyimide sheet being uniformly and substantially completely textured and coated with an electroless nickel or cobalt coating directly on said second surface and an electrolytic copper coating on said nickel or cobalt coating, each of said polyimide sheet surfaces coated with a metal being free of an adhesive; the coating on said second surface having a peel strength of at least 6.0 lb./in. as measured by IPC test 2.4.9 Method A and a peel strength of at least 4.5 lb./in. as measured by IPC test 2.4.9 Method C and being capable of passing the IPC test 2.4.13 for solder float.
Claim 8
Dependent Claim
164 words
A polyimide laminate sheet product including as one layer of said laminate sheet product a polyimide sheet having two surfaces, at least one of said polyimide sheet surfaces being uniformly and substantially completely textured and one of said polyimide sheet surfaces being uncoated or being uniformly and substantially completely textured and coated with an electroless nickel or cobalt coating, a second surface of said polyimide sheet being uniformly and substantially completely textured and coated with an electroless nickel or cobalt coating directly on said second surface and an electrolytic copper coating on said nickel or cobalt coating, each of said polyimide sheet surfaces coated with a metal being free of an adhesive; the coating on said second surface having a peel strength of at least 6.0 lb./in. as measured by IPC test 2.4.9 Method A and a peel strength of at least 4.5 lb./in. as measured by IPC test 2.4.9 Method C and being capable of passing the IPC test 2.4.13 for solder float.
Claim 9
Dependent Claim
14 words
The product of claim 6 wherein said electroless coating is a nickel containing alloy.
Claim 10
Dependent Claim
17 words
A product of claim 6 wherein said electroless metal coating is cobalt or a cobalt containing alloy.
Claim 11
Dependent Claim
20 words
The product of any one of claims 2, 6, 7 or 8 wherein said metal coating including copper is patterned.
References Cited (Backward Citations)
US3338726A
Cited
US3062666A
Cited
US3011920A
Cited
US3140188A
Cited
US3179614A
Cited
US3179634A
Cited
US3573973A
Cited
US3562038A
Cited
US3531301A
Cited
US3537878A
Cited
US3682960A
Cited
US3767538A
Cited
US3791848A
Cited
US3821016A
Cited
US4078096A
Cited
US3954570A
Cited
US4297397A
Cited
US4148969A
Cited
JPS53135840A
Cited
JPS54139978A
Cited
DE2939236A1
Cited
US4496794A
Cited
US4503112A
Cited
EP0116297A2
Cited
JPS59187847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |