Manufacture of circuit boards
Abstract
Abstract A CIRCUIT BOARD, IN WHICH CIRCUITS ARE FORMED ON A DIELECTRIC SUBSTRATE MEMBER BY A LAYER OF CONDUCTIVE MATERIAL BONDED TO ONE SIDE OF THE SUBSTRATE MEMBER, OR BY TWO LAYERS OF CONDUCTIVE MATERIAL BONDED ONE TO EACH SIDE OF THE SUBSTRATE MEMBER, IS MANUFACTURED BY THE FOLLOWING STEPS: FORMING HOLES IN DESIRED POSITIONS THROUGH THE SUBSTRATE MEMBER TO FORM TERMINAL POINTS OF A DESIRED CIRCUIT LAYOUT, BONDING THE LAYER OR LAYERS OF CONDUCTIVE MATERIAL TO THE SUBSTRATE MEMBER AND OVER THE HOLES, PRINTING AND ETCHING THE CIRCUIT, AND DRAWING THAT PART OF THE LAYER OR LAYERS OVER THE HOLES INTO THE HOLES IN A MECHANICAL OPERATION TO FORM A CONDUCTIVE WALL OR WALLS IN EACH OF THE HOLES.
Inventors
- 👤 George W Edwards
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |