US3857798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CONDUCTIVE INK COMPOSITION CONTAINING Pd AND Pb METAL POWDERS
Assignee: ZF International UK Ltd
•
Filing: 1972-07-27
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Granted: 1974-12-31
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Expires: 1992-07-27
Abstract
Abstract An ink for use in thick film printed circuits comprises palladium powder, lead powder, the ratio of the weight of the palladium powder to the weight of the lead powder being in the range of 3:1 to 3:2 an inorganic bonding material and a binder liquid.
Inventors
- 👤 D Wall
- 👤 N Burr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:13
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
AN INK FOR USE IN THE MANUFACTURE OF A THICK FILM CIRCUIT, SAID INK COMPRISING PALLADIUM POWDER, LEAD POWER, THE RATIO OF THE WEIGHT OF THE PALLADIUM POWDER TO THE WEIGHT OF THE LEAD POWDER BEING IN THE RANGE OF 3:1 TO 3:2 AN INORGANIC BONDING MATERIAL AND A BINDER LIQUID.
Claim 2
Dependent Claim
51 words
AN INK FOR USE IN THE MANUFACTURE OF A THICK FILM CIRCUIT, SAID INK COMPRISING PALLADIUM POWDER, LEAD POWER, THE RATIO OF THE WEIGHT OF THE PALLADIUM POWDER TO THE WEIGHT OF THE LEAD POWDER BEING IN THE RANGE OF 3:1 TO 3:2 AN INORGANIC BONDING MATERIAL AND A BINDER LIQUID.
Claim 3
Dependent Claim
20 words
An ink as claimed in claim 1 in which the ratio of palladium to lead is approximately 13:7 by weight.
Claim 4
Dependent Claim
33 words
An ink as claimed in claim 2 in which the ratio of the total weight of metal powder to the weight of the inorganic bonding material is in the range 50:1 to 5:1.
Claim 5
Dependent Claim
32 words
An ink as claimed in claim 3 in which the ratio of the weight of metal powder to the weight of inorganic bonding material is in the range of 20:1 to 20:3.
Claim 6
Dependent Claim
17 words
An ink as claimed in claim 4 in which the high temperature binder is a glass frit.
Claim 7
Dependent Claim
45 words
An ink as claimed in claim 5 in which the glass frit comprises PbO, ZnO, SiO2 and B2O3, and has a softening range of 410* to 420* C and a coefficient of thermal expansion in the region of 8.1 X 10 6 per * C.
Claim 8
Dependent Claim
34 words
An ink as claimed in claim 6 in which the binder liquid is present in the range of 28 to 31.5% by weight and has a viscosity at 20* C of 9,200 Redwood seconds.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |