US3728178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing flexible copper laminate for printed circuits
Assignee: Olin Corp
•
Filing: 1971-05-27
•
Granted: 1973-04-17
•
Expires: 1991-05-27
Abstract
Abstract A METHOD OF PRODUCING A LAMINATE HAVING HIGH BOND STRENGTH AND EXCELLENT RESISTANCE TO ACID UNDERCUTTING COMPRISING OXIDIZING COPPER OR ITS ALLOYS TO FORM AN OXIDE FILM, APPLYING A PHOSPHORIC ACID SOLUTION TO THE OXIDDE FILM, RINSING,, DRYING, AND ADHESIVELY LAMINATING TO A PLASTIC FILM. THE INSTANT CASE ALSO TEACHES A METHOD OF PRODUCING HIGH TARNISH RESISTANCE ON COPPER AND ITS ALLOYD BY SO OXIDIZIING AND PHOSPHATIINGG AND FURTHER TEACHES A FLEXIBLE PRINTED CIRCUIT WHEREIN THE UNWANTED COPPER PORTION OF THE FORMED LAMINATE IS ETCHED AWAY, CHARACTERIZED BY HIGH PEEL STRENGTH AND SUBSTANTIALLY NO ACID UNDERCUTTING OF THE FORMED CIRCUITRY.
Inventors
- 👤 E Caule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:56
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/24; C23C22/33; B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; C23C22/78; C23C22/82; C23C22/83; G; G03; G03C; G03C1/00; G03C1/76; H; H05; H05K; H05K3/00; H05K3/38; H05K3/382; H05K3/385; H05K1/00; H05K1/02; H05K1/03; H05K1/0393; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/03; H05K2203/0315
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |