Patent US4732794A successfully refreshed from Google Patents.
US4732794A
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Porcelain enamel composition and substrates coated therewith
Assignee: Bayer Corp
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Filing: 1986-10-02
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Granted: 1988-03-22
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Expires: 2006-10-02
Abstract
Abstract A partially devitrified porcelain enamel composition is formed by melting an oxide mixture in which 20-50 wt % BaO, 30-60 wt % SiO2, and 2-20 wt % TiO2 are present to form a homogeneous melt, quenching the melt to form a frit and firing the frit. The oxide mixture may optionally include K2O, Na2O, Li2O, Al2O3, B2O3, As2O3, CaO, CeO2, MgO, F2, N2O5, PbO, P2O5, Sb2O3, SnO2, SrO, ZnO, ZrO2, and MoO3. Metal substrates coated with such a partially devitrified porcelain enamel composition are particularly suitable for the production of electronic circuits.
Inventors
- 👤 Robert L. Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:54
CPC Classifications
C; C03; C03C; C03C8/00; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K1/053; C03C8/02; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24926
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
191 words
A partially devitrified porcelain enamel composition formed by melting a mixture of materials which upon melting form an oxide mixture consisting essentially of: (a) 20-50 wt % BaO (b) 30-60 wt % SiO 2 (c) 2-20 wt % TiO 2 (d) 0-16 wt % K 2 O (e) 0-4 wt % Na 2 O (f) 0-4 wt % Li 2 O (g) 0-10 wt % Al 2 O 3 (h) 0-3 wt % B 2 O 3 (i) 0-3 wt % As 2 O 3 (j) 0-10 wt % CaO (k) 0-3 wt % CeO 2 (l) 0-10 wt % MgO (m) 0-3 wt % F 2 (n) 0-3 wt % N 2 O 5 (o) 0-3 wt % PbO (p) 0-3 wt % P 2 O 5 (q) 0-3 wt % Sb 2 O 3 (r) 0-3 wt % SnO 2 (s) 0-10 wt % SrO (t) 0-7 wt % ZnO (u) 0-10 wt % ZrO 2 and (v) 0-3 wt % MoO 3 with the total weight percent being approximately 100 wt % to form a homogeneous melt, quenching the melt to form a frit and firing the frit.
Claim 2
Dependent Claim
191 words
A partially devitrified porcelain enamel composition formed by melting a mixture of materials which upon melting form an oxide mixture consisting essentially of: (a) 20-50 wt % BaO (b) 30-60 wt % SiO 2 (c) 2-20 wt % TiO 2 (d) 0-16 wt % K 2 O (e) 0-4 wt % Na 2 O (f) 0-4 wt % Li 2 O (g) 0-10 wt % Al 2 O 3 (h) 0-3 wt % B 2 O 3 (i) 0-3 wt % As 2 O 3 (j) 0-10 wt % CaO (k) 0-3 wt % CeO 2 (l) 0-10 wt % MgO (m) 0-3 wt % F 2 (n) 0-3 wt % N 2 O 5 (o) 0-3 wt % PbO (p) 0-3 wt % P 2 O 5 (q) 0-3 wt % Sb 2 O 3 (r) 0-3 wt % SnO 2 (s) 0-10 wt % SrO (t) 0-7 wt % ZnO (u) 0-10 wt % ZrO 2 and (v) 0-3 wt % MoO 3 with the total weight percent being approximately 100 wt % to form a homogeneous melt, quenching the melt to form a frit and firing the frit.
Claim 3
Dependent Claim
29 words
The composition of claim 1 in which the molten mixture contains (a) 25-45 wt % BaO (b) 35-50 wt % SiO 2 and (c) 4-10 wt % TiO 2
Claim 4
Dependent Claim
54 words
The composition of claim 2 in which the molten mixture further contains (d) 0-12 wt % K 2 O (g) 2-8 wt % Al 2 O 3 (j) 0-5 wt % CaO (l) 0-5 wt % MgO (s) 0-5 wt % SrO (t) 0-5 wt % ZnO and (w) 0-5 wt % ZrO 2
Claim 5
Dependent Claim
30 words
The composition of claim 1 in which at least two of the oxides selected from Li 2 O, Na 2 O, and K 2 O are present in the melt.
Claim 6
Dependent Claim
67 words
The composition of claim 1 in which the molten mixture contains (a) 33 wt % BaO (b) 37.6 wt % SiO 2 (c) 7.0 wt % TiO 2 (d) 13 wt % K 2 O (e) 3.3 wt % Na 2 O (g) 6.0 wt % Al 2 O 3 (i) 0.1 wt % As 2 O 3 and (n) 1.25 wt % N 2 O 5
Claim 7
Dependent Claim
25 words
A coated substrate suitable for the production of electronic circuits which is a metal substrate coated with the partially devitrified porcelain enamel of claim 1.
Claim 8
Dependent Claim
25 words
A coated substrate suitable for the production of electronic circuits which is a metal substrate coated with the partially devitrified porcelain enamel of claim 2.
Claim 9
Dependent Claim
25 words
A coated substrate suitable for the production of electronic circuits which is a metal substrate coated with the partially devitrified porcelain enamel of claim 3.
Claim 10
Dependent Claim
25 words
A coated substrate suitable for the production of electronic circuits which is a metal substrate coated with the partially devitrified porcelain enamel of claim 4.
Claim 11
Dependent Claim
25 words
A coated substrate suitable for the production of electronic circuits which is a metal substrate coated with the partially devitrified porcelain enamel of claim 5.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
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