US3775119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photomechanical method of producing grounded printed circuits
Assignee: United States Department of the Air Force
•
Filing: 1971-12-14
•
Granted: 1973-11-27
•
Expires: 1991-12-14
Abstract
Abstract A photomechanical method of producing a grounded printed circuit utilizes an ungrounded circuit negative, a base film and a diffuser sandwiched therebetween to produce a negative mask having a spread image thereon. This negative mask is used in conjunction with the original ungrounded circuit negative to produce a composite positive which contains the required ground plane and upon which any further terminal grounding can be made. The resultant grounded composite negative is utilized to form the grounded printed circuit.
Inventors
- 👤 S Bemis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:59
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0002; H05K1/00; H05K1/02; H05K1/0213; H05K1/0216; H05K1/0218; H05K2203/00; H05K2203/05; H05K2203/0548; H05K2203/056
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1725395A
Cited
US1967057A
Cited
US2752245A
Cited
US3510305A
Cited
US3169063A
Cited
US3423205A
Cited
US3508826A
Cited
US3669666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |