US4309485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enameled steel plate
Assignee: Niterra Co Ltd
•
Filing: 1981-02-24
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Granted: 1982-01-05
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Expires: 2001-02-24
Abstract
Abstract An enameled steel plate is disclosed having a linear thermal coefficient of expansion at a temperature between 30 DEG C. and 500 DEG C. within the range of from 100x10-7 to 190x10-7/ DEG C. and covered with phosphate glass or crystallized glass consisting essentially of from 40 to 75 mol % component X, from 20 to 55 mol % component Y, and from 0.1 to 10 mol % component Z, wherein Component X is P2O5; Component Y is selected from ZnO, K2O, B2O3 and Al2O3 in an amount of up to 20 mol % and CaO and BaO in an amount of up to 55 mol %; and Component Z is selected from SrO, Ta2O5, La2O3, CeO2, and Nb2O5. The product has improved water resistance and chemical durability especially in high temperature and high humidity environment, and therefore, is suitable for use in thick film hybrid integrated circuits employed in automobiles.
Inventors
- 👤 Kazuo Kondo
- 👤 Akio Takami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:51
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/08; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/053; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/6875; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
An enameled steel plate having a linear thermal coefficient of expansion at a temperature between 30° C. and 500° C. within the range of from 100×10 -7 to 190×10 -7 /°C. and covered with phosphate glass or crystallized glass consisting essentially of from 40 to 75 mol % component X, from 20 to 55 mol % component Y, and from 0.1 to 10 mol % component Z, wherein Component X is P 2 O 5 ; Component Y is selected from ZnO, K 2 O, B 2 O 3 and Al 2 O 3 in an amount of up to 20 mol %, and CaO and BaO in an amount of up to 55 mol %; Component Z is selected from SrO, Ta 2 O 5 , La 2 O 3 , CeO 2 , and Nb 2 O 5 .
Claim 2
Dependent Claim
141 words
An enameled steel plate having a linear thermal coefficient of expansion at a temperature between 30° C. and 500° C. within the range of from 100×10 -7 to 190×10 -7 /°C. and covered with phosphate glass or crystallized glass consisting essentially of from 40 to 75 mol % component X, from 20 to 55 mol % component Y, and from 0.1 to 10 mol % component Z, wherein Component X is P 2 O 5 ; Component Y is selected from ZnO, K 2 O, B 2 O 3 and Al 2 O 3 in an amount of up to 20 mol %, and CaO and BaO in an amount of up to 55 mol %; Component Z is selected from SrO, Ta 2 O 5 , La 2 O 3 , CeO 2 , and Nb 2 O 5 .
Claim 3
Dependent Claim
44 words
An enameled steel plate as in claim 1 wherein said component Z is selected from SrO, Ta 2 O 5 , La 2 O 3 , CeO 2 , and Nb 2 O 5 in an amount of from 1 to 8 mol %.
Claim 4
Dependent Claim
20 words
An enameled steel plate as in claim 1 or 2 wherein the steel plate is stainless steel or cold-rolled steel.
Claim 5
Dependent Claim
220 words
A process for producing enamel steel plate having a linear thermal coefficient of expansion at a temperature between 30° C. and 500° C. within the range of from 100×10 -7 to 190×10 -7 /°C. and covered with phosphate glass or crystallized glass composed of from 40 to 75 mol % component X, from 20 to 55 mol % component Y, and from 0.1 to 10 mol % component Z, wherein Component X is P 2 O 5 ; Component Y is selected from ZnO, K 2 O, B 2 O 3 and Al 2 O 3 in an amount of up to 20 mol % and CaO and BaO in an amount of up to 55 mol %; and Component Z is selected from SrO, Ta 2 O 5 , La 2 O 3 , CeO 2 , and Nb 2 O 5 , which comprises grinding and admixing oxides or precursors of the oxides constituting components X, Y, and Z in a grinder, grinding the resulting mixture, melting said mixture in a crucible, quenching the melted mixture in water, vitrifying the melt, finely grinding the resulting vitreous substance to obtain a frit powder having an average particle diameter of 10μ or less, covering a steel plate with said frit powder, and baking the plate covered with said frit powder.
Claim 6
Dependent Claim
220 words
A process for producing enamel steel plate having a linear thermal coefficient of expansion at a temperature between 30° C. and 500° C. within the range of from 100×10 -7 to 190×10 -7 /°C. and covered with phosphate glass or crystallized glass composed of from 40 to 75 mol % component X, from 20 to 55 mol % component Y, and from 0.1 to 10 mol % component Z, wherein Component X is P 2 O 5 ; Component Y is selected from ZnO, K 2 O, B 2 O 3 and Al 2 O 3 in an amount of up to 20 mol % and CaO and BaO in an amount of up to 55 mol %; and Component Z is selected from SrO, Ta 2 O 5 , La 2 O 3 , CeO 2 , and Nb 2 O 5 , which comprises grinding and admixing oxides or precursors of the oxides constituting components X, Y, and Z in a grinder, grinding the resulting mixture, melting said mixture in a crucible, quenching the melted mixture in water, vitrifying the melt, finely grinding the resulting vitreous substance to obtain a frit powder having an average particle diameter of 10μ or less, covering a steel plate with said frit powder, and baking the plate covered with said frit powder.
Claim 7
Dependent Claim
15 words
A process as in claim 4 wherein the average particle diameter is 5μ or less.
Claim 8
Dependent Claim
44 words
A process as in claim 4 or 5 wherein said Component Z is selected from SrO, Ta 2 O 5 , La 2 O 3 , CeO 2 , and Nb 2 O 5 in an amount of from 1 to 8 mol %.
Claim 9
Dependent Claim
18 words
A process as in claim 4 or 5 wherein the steel plate is stainless steel or cold-rolled steel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |