Patent US4555773A successfully refreshed from Google Patents.
US4098628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of laminating a cover layer for flexible circuits
Assignee: Unisys Corp
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Filing: 1976-09-27
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Granted: 1978-07-04
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Expires: 1996-09-27
Abstract
Abstract A method of laminating a cover layer for flexible circuits which provides increased flexibility. The cover layer encapsulates a flexible circuit having a plurality of spaced conductors on a flexible insulating substrate. The cover layer is a tri-layered laminate having a first layer of insulating film, a second intermediate layer of a thermosetting adhesive, and a third layer of a phenolic resin adhesive. The cover layer is bonded to the flexible circuit with the third layer of phenolic resin adhesive being contiguous the conductors.
Inventors
- 👤 Tommy L. Walton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/08; H01B7/0838; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/281; H05K3/38; H05K3/386; H01B11/00; H01B11/02; H01B11/06; H01B11/10; H01B11/1008; H05K1/00; H05K1/02; H05K1/03; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/0183; H05K2201/0195; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31678; Y10T428/31688; Y10T428/31721; Y10T428/31786; Y10T428/31942
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
In a method of making an encapsulated flexible circuit having a plurality of spaced conductors affixed to a flexible substrate by a first thermosetting adhesive layer, the improvement comprising: placing an insulating film with a second thermosetting adhesive layer on one surface thereof onto a sheet of phenolic resin adhesive with said second thermosetting adhesive layer in contact with said phenolic adhesive to form a tri-layered cover layer; placing said tri-layered cover layer onto said flexible substrate to cover said conductors with said phenolic adhesive adjacent to said conductors; and laminating said tri-layered cover layer to the flexible substrate thereby encapsulating said conductors with said phenolic resin adhesive being between said first and second thermosetting adhesive layers so as to inhibit the outgasing of said phenolic resin and reduce the thermoplastic characteristics of said phenolic resin so that it can withstand extremely high pressures and temperatures.
Claim 2
Dependent Claim
146 words
In a method of making an encapsulated flexible circuit having a plurality of spaced conductors affixed to a flexible substrate by a first thermosetting adhesive layer, the improvement comprising: placing an insulating film with a second thermosetting adhesive layer on one surface thereof onto a sheet of phenolic resin adhesive with said second thermosetting adhesive layer in contact with said phenolic adhesive to form a tri-layered cover layer; placing said tri-layered cover layer onto said flexible substrate to cover said conductors with said phenolic adhesive adjacent to said conductors; and laminating said tri-layered cover layer to the flexible substrate thereby encapsulating said conductors with said phenolic resin adhesive being between said first and second thermosetting adhesive layers so as to inhibit the outgasing of said phenolic resin and reduce the thermoplastic characteristics of said phenolic resin so that it can withstand extremely high pressures and temperatures.
Claim 3
Dependent Claim
23 words
An improvement according to claim 1 wherein: said thermosetting adhesive is a modified epoxy adhesive; and said phenolic resin adhesive is phenolic butyrate.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |