Patent US4824511A successfully refreshed from Google Patents.
US4824511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer circuit board with fluoropolymer interlayers
Assignee: EIDP Inc
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Filing: 1987-10-19
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Granted: 1989-04-25
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Expires: 2007-10-19
Abstract
Abstract A multilayer circuit board consisting of multiple circuit layers supported on sheets of PTFE or PTFE containing a fibrous stiffening agent, said circuit-bearing sheets being joined in fixed relative positions by means of separating layers of a adhesive unsintered tetrafluoroethylene resin.
Inventors
- 👤 Frederick N. Hartman
- 👤 Alan C. Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:54
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/46; H05K3/4644; H05K3/4652; H05K3/4655; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/034; H05K1/0353; H05K1/0366; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/015; H05K2201/07; H05K2201/0707; H05K2201/0715; H05K2203/00; H05K2203/13; H05K2203/1333; H05K2203/1355; H05K3/4611; H05K3/4626; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A process of assembling circuit-bearing sheets containing surface portions of conductive circuitry and surface portions of polytetrafluoroethylene to form multilayer laminates in which unsintered tetrafluoroethylene polymer made by dispersion polymerization is inserted between the sheets, pressure is applied at 50-1000 psi at a temperature below the fusion temperature of the polymer to encapsulate the circuits, and, in a separate step at a lower pressure of 0-50 psi the assembly is heated above the fusion temperature of the polymer to fuse the polymer particles into a continuous mass.
Claim 2
Dependent Claim
87 words
A process of assembling circuit-bearing sheets containing surface portions of conductive circuitry and surface portions of polytetrafluoroethylene to form multilayer laminates in which unsintered tetrafluoroethylene polymer made by dispersion polymerization is inserted between the sheets, pressure is applied at 50-1000 psi at a temperature below the fusion temperature of the polymer to encapsulate the circuits, and, in a separate step at a lower pressure of 0-50 psi the assembly is heated above the fusion temperature of the polymer to fuse the polymer particles into a continuous mass.
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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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |