US5077084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a flexible printed base
Assignee: JNC Corp
•
Filing: 1990-02-01
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Granted: 1991-12-31
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Expires: 2010-02-01
Abstract
Abstract In a process for producing a flexible printed base by directly coating a copper foil with a polyimide precursor, followed by heating, drying and curing, a process affording a flexible printed base having a superior folding endurance and a good heat resistance at a cheap cost is provided, which process comprises carrying out the curing in an inert gas under a tension of 0.02 to 0.2 Kg/cm and at 200° and 450° C.
Inventors
- 👤 Shiro Konotsune
- 👤 Atsushi Takahashi
- 👤 Shouichi Fukunaga
- 👤 Kazutsune Kikuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:29
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/02; B05D3/0254; B05D3/04; B05D3/0486; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K3/00; H05K3/02; H05K3/022; B05D2505/00; B05D2505/50; Y; Y10; Y10S; Y10S29/00; Y10S29/042
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
A process for producing a flexible printed base which comprises the steps of (a) directly coating a copper foil with a polyimide precursor, and (b) subjecting said coated copper foil to heating, drying and curing, the curing being carried out in an inert gas under a tension of 0.02 to 0.2 Kg/cm and at a temperature of 200° C. to 450° C.
Claim 2
Dependent Claim
62 words
A process for producing a flexible printed base which comprises the steps of (a) directly coating a copper foil with a polyimide precursor, and (b) subjecting said coated copper foil to heating, drying and curing, the curing being carried out in an inert gas under a tension of 0.02 to 0.2 Kg/cm and at a temperature of 200° C. to 450° C.
Claim 3
Dependent Claim
34 words
A process for producing a flexible printed base according to claim 1 wherein said inert gas is nitrogen gas having an oxygen concentration of 0.5% by volume or less based upon the nitrogen gas.
Claim 4
Dependent Claim
23 words
A process for producing a flexible printed base according to claim 1 wherein an electrolytic copper foil is used as said copper foil.
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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) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |