US4966786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioning means for printed circuits
Assignee: Bayer Pharma AG
•
Filing: 1988-08-11
•
Granted: 1990-10-30
•
Expires: 2008-08-11
Abstract
Abstract A conditioning means for basis material for producing printing circuits is an alkaline solution of a halogen-free palladium salt and 2-aminopyridine.
Inventors
- 👤 Hans-Jurgen Ehrich
- 👤 Hartmut Mahlkow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:21
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; C23C18/28; C23C18/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A conditioning means for protecting a basic material of a printed circuit from aggressive treatment solutions during producing the printed circuit by one of surge and spray processes, said conditioning means comprising an oxidation-insensitive alkali solution containing a halogen-free palladium salt and 2-aminopyridine, having a Ph value of 10-11, and further containing a boron acid.
Claim 2
Dependent Claim
55 words
A conditioning means for protecting a basic material of a printed circuit from aggressive treatment solutions during producing the printed circuit by one of surge and spray processes, said conditioning means comprising an oxidation-insensitive alkali solution containing a halogen-free palladium salt and 2-aminopyridine, having a Ph value of 10-11, and further containing a boron acid.
Claim 3
Dependent Claim
17 words
A conditioning means as defined in claim 1, wherein said halogen-free palladium salt is a palladium sulfate.
Claim 4
Dependent Claim
17 words
A conditioning means as defined in claim 1, wherein said solution has a pH value of 10.5.
Claim 5
Dependent Claim
22 words
A conditioning means as defined in claim 1, wherein said solution contains 0.08-0.2 g/l of palladium salt and 1.5-2.5 g/l of 2-aminopyridine.
Claim 6
Dependent Claim
16 words
A conditioning means as defined in claim 4, wherein said solution contains 0.15 g/l of palladium.
Claim 7
Dependent Claim
16 words
A conditioning means as defined in claim 4, wherein said solution contains 1.8 g/l of 2-aminopyridine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |