Patent US4486813A successfully refreshed from Google Patents.
US4486813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic capacitor with nickel terminations
Assignee: MRA Laboratories Inc
•
Filing: 1983-12-12
•
Granted: 1984-12-04
•
Expires: 2003-12-12
Abstract
Abstract An activator composition paste includes a homogeneous dispersion of a palladium and commensurate amounts of silicon and of zinc. A screen printed layer of this paste is applied to a ceramic capacitor body to form electrodes, terminations or both. The body is heated to 615° C. and subsequently electroless nickel plated providing excellent electrical and mechanical connection of the plated nickel to the ceramic.
Inventors
- 👤 John P. Maher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:27
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/1851; C23C18/1855; C23C18/1862; C23C18/1865; C23C18/1872; C23C18/1886; C23C18/1889
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A ceramic capacitor comprising a dielectric ceramic body; one and another film of an electroless-nickel-activator composition being directly deposited onto one and another separate portions of the surface of said ceramic body, said activator composition consisting essentially of palladium, zinc, and silicon having at least half as much by silicon as palladium and at least 1.3 times as much zinc as silicon, all by weight; and two termination layers of nickel, respectively, overlying and conforming to said one and another activator films.
Claim 2
Dependent Claim
82 words
A ceramic capacitor comprising a dielectric ceramic body; one and another film of an electroless-nickel-activator composition being directly deposited onto one and another separate portions of the surface of said ceramic body, said activator composition consisting essentially of palladium, zinc, and silicon having at least half as much by silicon as palladium and at least 1.3 times as much zinc as silicon, all by weight; and two termination layers of nickel, respectively, overlying and conforming to said one and another activator films.
Claim 3
Dependent Claim
26 words
The capacitor of claim 1 wherein said separate nickel layers and corresponding activator films serve as the electrodes as well as the terminations of said capacitor.
Claim 4
Dependent Claim
72 words
The capacitor of claim 1 additionally comprising a first group of spaced parallel metal sheet electrodes being buried in said ceramic body and extending to said one body surface portion; another group of buried metal sheet electrodes being interleaved with and spaced from said first group electrodes and extending to said another body surface portion; said one and another activator films contacting, respectively, said one and another groups of said buried electrodes.
Claim 5
Dependent Claim
16 words
The capacitor of claim 1 wherein said nickel layers are more than 40 micro inches thick.
Claim 6
Dependent Claim
21 words
The capacitor of claim 1 wherein the weight per square centimeter of palladium in said films is greater than 0.18 micrograms.
Claim 7
Dependent Claim
17 words
The capacitor of claim 1 wherein the silicon to palladium ratio by weight is less than 36.
References Cited (Backward Citations)
US3555376A
Cited
US3717483A
Cited
US3612963A
Cited
US3989987A
Cited
US4104421A
Cited
US4075681A
Cited
US4130854A
Cited
US4082906A
Cited
US4150995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |