US3754939A
Expired / Lapsed
US
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Electroless deposition of palladium alloys
Assignee: United States Department of the Army
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Filing: 1972-05-23
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Granted: 1973-08-28
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Expires: 1992-05-23
Abstract
Abstract A plating solution for providing an electroless deposit of palladium alloys wherein palladium predominates, with a minor amount of nickel, cobalt, or zinc. The electroless palladium alloys contain up to about 6% nickel, or 10% cobalt, or 36% zinc, each with phosphorus. Preferred bath compositions comprise 29.6 g/l NiSO4.6H2O, or 29.6 g/l CoSO4.6H2O, or 36.0 g/l ZnSO4.8H2O, with: PdCl2-2 g/l HCl (38%)-4 ml/l NH4OH (28%)-160 ml/l NH4Cl-27 g/l NaH2PO2.H2
Inventors
- 👤 F Pearlstein
- 👤 R Weightman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:40
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
5 to 4 g/l PdCl2, 1.0 to 8 ml/l 38% HCl, 80 to 320 ml/l 28% NH4OH, 10 to 54 g/l NH4Cl, and 5 to 20 g/l NaH2PO2.H2O, said bath composition including a member of the group consisting of NiSO4.6H2O, CoSO4.6H2O, and ZnSO4.8H2O for forming an alloy of Pd-Ni-P, Pd-Co-P, and Pd-Zn-P respectively.
Claim 2
Dependent Claim
59 words
The composition as described in claim 1 wherein said PdCl2 is present in an amount of 2 g/l, said HCl is present in an amount of 4 ml/l, said NH4OH is present in an amount of 160 ml/l, said NH4Cl is present in an amount of 27 g/l, and said NaH2PO2.H2O is present in an amount of 10 g/l.
Claim 3
Dependent Claim
22 words
The bath composition as described in claim 1 wherein said NiSO4.6H2O is present in an amount between about 1 to 40 g/l.
Claim 4
Dependent Claim
22 words
The bath composition as described in claim 1 wherein said CoSO4.6H2O is present in an amOunt between about 1 to 40 g/l.
Claim 5
Dependent Claim
22 words
The bath composition as described in claim 1 wherein said ZnSO4.8H2O is present in an amount between about 1 to 40 g/l.
Claim 6
Dependent Claim
19 words
The bath composition as described in claim 1 wherein said NiSO4.6H2O is present in an amount of 29.6 g/l.
Claim 7
Dependent Claim
19 words
The bath composition as described in claim 1 wherein said CoSO4.6H2O is present in an amount of 29.6 g/l.
Claim 8
Dependent Claim
19 words
The bath composition as described in claim 1 wherein said ZnSO4.8H2O is present in an amount of 36.0 g/l.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |