US3605260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making multilayer printed circuits
Assignee: Motors Liquidation Co
•
Filing: 1968-11-12
•
Granted: 1971-09-20
•
Expires: 1988-11-12
Abstract
Abstract IN A METHOD OF MAKING PRINTED CIRCUITS A THICK CONDUCTIVE SHEET CARRIED BY A SUBSTRATE IS ETCHED TO FORM CIRCUIT PATHWAYS. THE PATHWAYS ARE REDUCED IN THICKNESS BY PARTIAL ETCHING EXCEPT CERTAIN PORTIONS WHOSE THICKNESS IS PRESERVED TO FORM INTERCONNECTIONS. THE ETCHED AWAY PORTIONS ARE FILLED WITH INSULATING MATERIAL AND A SECOND SET OF CONDUCTORS ARE FORMED THEREON CONNECTING WITH THE INTERCONNECTION POINTS.
Inventors
- 👤 Jack P Spridco
- 👤 Thomas A Mancewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:42
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/46; H05K3/4644; H05K3/4647; H05K2203/00; H05K2203/03; H05K2203/0369; H05K2203/07; H05K2203/0703; H05K2203/0733; H05K3/02; H05K3/06; H05K3/10; H05K3/18; H05K3/181
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |