US4446188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layered circuit board
Assignee: Mica Corp
•
Filing: 1979-12-20
•
Granted: 1984-05-01
•
Expires: 1999-12-20
Abstract
Abstract A layered clad laminate with universal center plane adapted for the manufacture of printed wiring board comprising an electrically conductive self-sustaining, integral metal center sheet having, in repetitive fashion, a series of predetermined patterns of punched or photochemically developed openings therein, said sheet being pressed between electrical insulating layers of resin impregnated reinforcing material, said layers being adhered to said sheet and to each other through said openings, and on each of the outer surfaces of said laminate and adhered thereto a layer of electrically conductive metal foil which is essentially uniform and imperforate.
Inventors
- 👤 Harshad K. Patel
- 👤 Andjelko Illick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:30
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; H; H05; H05K; H05K1/00; H05K1/02; H05K1/0286; H05K1/0287; H05K1/029; H05K3/00; H05K3/44; H05K3/445; H05K3/46; H05K3/4611; H05K3/4626; H05K3/4635; H05K3/4641; B32B2311/00; B32B2311/12; B32B2315/00; B32B2315/08; B32B2315/085; H05K1/0296; H05K1/0298; H05K1/03; H05K1/0393; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2201/09; H05K2201/09209; H05K2201/0929; H05K2201/093; H05K2201/095; H05K2201/09609; H05K2201/09818; H05K2201/09945; H05K2203/00; H05K2203/03; H05K2203/0323; H05K2203/15; H05K2203/1545; H05K3/0011; H05K3/0044; H05K3/0052; H05K3/02; H05K3/06; H05K3/061; H05K3/064; H05K3/40; H05K3/42; H05K3/425; H05K3/427; H05K3/429; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/24777; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/31678; Y10T428/31681; Y10T428/31688; Y10T428/31703; Y10T428/31721; Y10T428/31786
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A layered clad laminate with universal center plane adapted for the manufacture of printed wiring board comprising an electrically conductive self-sustaining, integral metal center sheet having, in repetitive fashion a series of predetermined patterns of drilled, punched or photochemically developed openings therein, said sheet being pressed between electrical insulating layers of resin impregnated reinforcing material, said layers being adhered to said sheet and to each other through said openings, and on each of the outer surfaces of said laminate and adhered thereto a layer of electrically conductive metal foil which is essentially uniform and imperforate.
Claim 2
Dependent Claim
95 words
A layered clad laminate with universal center plane adapted for the manufacture of printed wiring board comprising an electrically conductive self-sustaining, integral metal center sheet having, in repetitive fashion a series of predetermined patterns of drilled, punched or photochemically developed openings therein, said sheet being pressed between electrical insulating layers of resin impregnated reinforcing material, said layers being adhered to said sheet and to each other through said openings, and on each of the outer surfaces of said laminate and adhered thereto a layer of electrically conductive metal foil which is essentially uniform and imperforate.
Claim 3
Dependent Claim
11 words
The laminate of claim 1 wherein the conductive metal is copper.
Claim 4
Dependent Claim
35 words
The laminate of claim 1 wherein the center sheet comprises a series of larger sections joined by smaller connecting bridges which are adapted to be removed to provide for a plurality of electrically isolated sections.
Claim 5
Dependent Claim
21 words
The laminate of claim 1 wherein the center sheet weighs from about 1 to 2 ounces per square foot of area.
Claim 6
Dependent Claim
26 words
The laminate of claim 1 wherein the center sheet terminates short of the edge of the laminate to provide an insulating peripheral margin in said laminate.
References Cited (Backward Citations)
US1609222A
Cited
US2003494A
Cited
US3030237A
Cited
US3102213A
Cited
US3352730A
Cited
US3340607A
Cited
US3491197A
Cited
US3564114A
Cited
US3485934A
Cited
US3571923A
Cited
US3541222A
Cited
US3537176A
Cited
US3634602A
Cited
US3680209A
Cited
US3691632A
Cited
US3654097A
Cited
US3626081A
Cited
US3621116A
Cited
US3988408A
Cited
US4030190A
Cited
US4211603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |