US3607789A
Expired / Lapsed
US
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Electroconductive glaze and method for preparation
Assignee: Precision Electronic Components Ltd
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Filing: 1968-05-02
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Granted: 1971-09-21
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Expires: 1988-05-02
Abstract
Abstract An electroconductive glaze and process for formation thereof. The glaze comprises a particulate dispersion of conductive metals and/or metal oxides in a germanate glass matrix. The glaze is preferably formed by firing a paste comprising an intimate admixture of the particulate component with a crystallized, finely ground, lead germanate-based glass.
Inventors
- 👤 Gunciappa Krishna Murthy
- 👤 Raymond H Caley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:06
CPC Classifications
C; C03; C03C; C03C10/00; C03C10/0054; C03C3/00; C03C3/12; C03C3/253; H; H01; H01B; H01B1/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
13 words
A composition according to claim 1 wherein said glass is a lead borogermanate.
Claim 2
Dependent Claim
13 words
A composition according to claim 1 wherein said glass is a lead indogermanate.
Claim 3
Dependent Claim
31 words
A composition according to claim 1 wherein said conductive component comprises between 10 to 40 percent by weight, and said lead germanate comprises the remainder by weight, of said total composition.
Claim 4
Dependent Claim
61 words
An electroconductive glaze composition comprising a dispersion of finely powdered gold, platinum oxide, and ruthenium dioxide in a lead germanate glass matrix, the proportions of dispersed phase to matrix being in the range by weight 4 to 30 percent gold, 4 to 20 percent platinum oxide, 2 to 10 percent ruthenium oxide, and 60 to 90 percent lead germanate glass matrix.
Claim 5
Dependent Claim
14 words
A composition according to claim 5, further including up to 5 percent powdered platinum.
Claim 6
Dependent Claim
65 words
A paste suitable for firing into an electroconductive glaze comprising: a mixture of finely divided electrically conductive particles, finely divided crystalline lead germanate material, and temporary binders, the ratio present between said conductive component and said crystalline germanate material being in the range 40 to 10 p.p.h. by weight of said conductive component to 60 to 90 p.p.h., by weight of said crystalline germanate material.
Claim 7
Dependent Claim
13 words
A composition according to claim 7 wherein said material is a lead borogermanate.
Claim 8
Dependent Claim
13 words
A composition according to claim 7 wherein said material is a lead indogermanate.
Claim 9
Dependent Claim
17 words
A composition according to claim 7 wherein said conductive component comprises gold, platinum oxide, and ruthenium oxide.
Claim 10
Dependent Claim
10 words
A composition according to claim 10, further including powdered platinum.
Claim 11
Dependent Claim
44 words
A composition according to claim 11 wherein said conductive component comprises by weight of the combined conductive component aNd crystalline material, 4 to 20 percent gold, 4 to 20 percent platinum oxide, 2 to 6 percent ruthenium oxide, and 0 to 5 percent platinum.
Claim 12
Independent Claim
30 words
A method for forming an electroconductive glaze comprising: admixing a crystalline lead germanate powder with finely divided conductive particles and temporary binders, and firing said admixture to yield said glaze.
Claim 13
Dependent Claim
24 words
A method according to claim 13 wherein said particles are selected from the group consisting of the noble metals and the noble metal oxides.
Claim 14
Independent Claim
74 words
A method for forming an electroconductive glaze exhibiting stable electrical resistance characteristics with respect to temperature variation, comprising: a. forming a crystalline lead germanate powder; b. admixing said crystalline powder with conductive particulate matter in the ratio range of 40 to 10 p.p.h., by weight conductive component to 60 to 90 p.p.h., by weight of crystalline powder, and adding temporary binders to yield a paste; and c. firing said paste to form said glaze.
Claim 15
Dependent Claim
82 words
A method in accordance with claim 15 wherein said crystalline lead germanate powder is formed by: a. fusing germanium oxide and lead oxide together with oxides selected from the group consisting of boron oxide, indium oxide zinc oxide, aluminum oxide, zirconium oxide, manganese dioxide, and bismuth oxide, to yield a lead germanate glass; b. comminuting said glass to a fine powder; pressure compacting and heat treating said comminuted glass to crystallize said material; and comminuting said crystallized material to yield said powder.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |