US4469798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low melting, opaque enamel frit
Assignee: Panasonic Holdings Corp
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Filing: 1982-10-12
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Granted: 1984-09-04
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Expires: 2002-10-12
Abstract
Abstract A low melting, opaque enamel frit is described, which comprises 30 to 36 wt. % of SiO2, 15 to 20 wt. % of B2O3, 7 to 9 wt. % of Na2O, 5 to 10 wt. % of ZrO2, 10 to 17 wt. % of TiO2, 7 to 15 wt. % of K2O, 2 to 10 wt. % of F2 and 0.5 to 2.5 wt. % of P2O5. The total of Na2O and K2O is in the range of 15 to 20 wt. % and the total of TiO2 and ZrO2 is in the range of 15 to 20 wt. %. The ZrO2/(TiO2+ZrO2) ratio is in the range of 0.25 to 0.5:1 and the SiO2/B2O3 ratio is in the range of 1.5 to 2.4:1. In addition, the Na2O/K2O ratio is in the range of 0.6 to 1.0:1 and the (Na2O+K2O)/(TiO2+ZrO2) is in the range of 0.7 to 1.2:1.
Inventors
- 👤 Atsushi Nishino
- 👤 Kunio Kimura
- 👤 Masaki Ikeda
- 👤 Hajime Oyabu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:55
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/14; C03C8/20; C03C8/02; C03C8/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
215 words
A low melting, opaque enamel frit free of lead which consists essentially of a combination of 30 to 36 wt % of SiO 2 , 15 to 20 wt % of B 2 O 3 , 7 to 9 wt % of Na 2 O, 5 to 10 wt % of ZrO 2 , 10 to 17 wt % of TiO 2 , 7 to 15 wt % of K 2 O, 2 to 10 wt % of F 2 , and 0.5 to 2.5 wt % of P 2 O 5 as a stabilizer for the crystallized titanium oxide to enlarge the stable region of anatase in the crystallized titanium oxide, the total of Na 2 O and K 2 O being in the range of 14 to 20 wt %, the total of TiO 2 +ZrO 2 being in the range of 15 to 20 wt %, the ZrO 2 /(TiO 2 +ZrO 2 ) ratio being in the range of 0.25 to 0.5:1, the SiO 2 /B 2 O 3 ratio being in the range of 1.5 to 2.4:1, the Na 2 O/K 2 O ratio being in the range of 0.6 to 1.0:1, the (Na 2 O+K 2 O)/(TiO 2 +ZrO 2 ) being in the range of 0.7 to 1.2:1.
Claim 2
Dependent Claim
215 words
A low melting, opaque enamel frit free of lead which consists essentially of a combination of 30 to 36 wt % of SiO 2 , 15 to 20 wt % of B 2 O 3 , 7 to 9 wt % of Na 2 O, 5 to 10 wt % of ZrO 2 , 10 to 17 wt % of TiO 2 , 7 to 15 wt % of K 2 O, 2 to 10 wt % of F 2 , and 0.5 to 2.5 wt % of P 2 O 5 as a stabilizer for the crystallized titanium oxide to enlarge the stable region of anatase in the crystallized titanium oxide, the total of Na 2 O and K 2 O being in the range of 14 to 20 wt %, the total of TiO 2 +ZrO 2 being in the range of 15 to 20 wt %, the ZrO 2 /(TiO 2 +ZrO 2 ) ratio being in the range of 0.25 to 0.5:1, the SiO 2 /B 2 O 3 ratio being in the range of 1.5 to 2.4:1, the Na 2 O/K 2 O ratio being in the range of 0.6 to 1.0:1, the (Na 2 O+K 2 O)/(TiO 2 +ZrO 2 ) being in the range of 0.7 to 1.2:1.
Claim 3
Dependent Claim
39 words
A low melting, opaque enamel frit according to claim 1, further comprising up to 3 wt % of Li 2 O, the Li 2 O/(Na 2 O+K 2 O+Li 2 O) being in the range of 0.025 to 0.15:1.
Claim 4
Dependent Claim
37 words
A low melting, opaque enamel frit according to claim 1, further comprising up to 5 wt % of at least one member selected from the group consisting of CaO, Al 2 O 3 , ZnO, MgO, BaO.
Claim 5
Dependent Claim
43 words
A low melting, opaque enamel frit according to claim 1, wherein starting materials for the respective components are thermally molten at a temperature of 1100° to 1300° C. and after the melting, the melt is subjected to vitrification for 20 to 40 minutes.
Claim 6
Dependent Claim
27 words
A low melting, opaque enamel frit according to claim 1, wherein the content of K 2 O is in the range of 10 to 14 wt %.
References Cited (Backward Citations)
US2324812A
Cited
US3836373A
Cited
US3459574A
Cited
DE1496646A1
Cited
FR1482766A
Cited
US3867157A
Cited
US4147835A
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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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |