Manufacture of printed circuit boards
Abstract
Abstract The present invention relates to a process for producing two-sided printed circuit boards with metal-coated holes from insulating supports made of glass-synthetic resin laminate, in which the holes to be metal-coated are punched through the insulating support, a deposit of conductive metal is effected by chemical metal-coating in the holes and on the two faces, wiring is made by etching the conductive metal on the two faces after having deposited a reserve, then the electrical components are positioned in the metal-coated holes and the tails of the components are soldered in the respective holes to insure the electrical connections. Immediately after the holes have been punched, the support is coated with a positive-action photosensitive resin and the coated support is exposed to a radiation capable of destroying the resin, then it is dried.
Inventors
- 👤 Charles M. P. Lindebrings
- 👤 Pierre Vaillagou
- 👤 Andre J. F. Velte
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |