Patent US4011990A successfully refreshed from Google Patents.
Patent US4158081A successfully refreshed from Google Patents.
US4158081A
Expired / Lapsed
US
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Vitreous enamel flux and enamel coated article
Assignee: Corning Glass Works
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Filing: 1978-10-10
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Granted: 1979-06-12
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Expires: 1998-10-10
Abstract
Abstract There is disclosed a glass or glass-ceramic body with a coefficient of thermal expansion below 40×10 -7 /° C. and having an adherent, high gloss enamel fired on at least a portion of the external surface of the body, the enamel flux being composed, in percent by weight on a calculated oxide basis, of 25-40% SiO 2 , 40-60% PbO, at least 75% PbO+SiO 2 , 3-10% ZrO 2 , 4-12% B 2 O 3 , and 0.2-2.0% Li 2 O, being free of TiO 2 , optionally containing up to 2% Na 2 O+K 2 O and up to 4% CdO, having a coefficient of thermal expansion of 48-70×10 -7 /° C., a softening point below 660° C. and low lead and cadmium release values under either acid or alkaline conditions.
Inventors
- 👤 Dale R. Wexell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:15
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C8/10; C03C8/12; C03C17/00; C03C17/02; C03C2205/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
An enamel coated article comprising a glass or glass-ceramic body with a coefficient of thermal expansion below about 40× 10 -7 /° C. and having an adherent, high gloss enamel fired on at least a portion of the body's external surface, the enamel flux having a coefficient of thermal expansion in the range of 48-70× 10 -7 /° C., a softening point below 660° C., lead and cadmium release values below FDA standrds and a chemical composition consisting essentially of, in percent by weight as calculated from the bath on an oxide basis, 25-40% SiO 2 , 40-60% PbO, at least 75% PbO+ SiO 2 , 3-10% ZrO 2 , 4-12% B 2 O 3 and 0.2-2.0% Li 2 O, optionally containing up to 2% Na 2 O+ K 2 O and up to 4% CdO, and being free of TiO 2 .
Claim 2
Dependent Claim
143 words
An enamel coated article comprising a glass or glass-ceramic body with a coefficient of thermal expansion below about 40× 10 -7 /° C. and having an adherent, high gloss enamel fired on at least a portion of the body's external surface, the enamel flux having a coefficient of thermal expansion in the range of 48-70× 10 -7 /° C., a softening point below 660° C., lead and cadmium release values below FDA standrds and a chemical composition consisting essentially of, in percent by weight as calculated from the bath on an oxide basis, 25-40% SiO 2 , 40-60% PbO, at least 75% PbO+ SiO 2 , 3-10% ZrO 2 , 4-12% B 2 O 3 and 0.2-2.0% Li 2 O, optionally containing up to 2% Na 2 O+ K 2 O and up to 4% CdO, and being free of TiO 2 .
Claim 3
Dependent Claim
21 words
An enamel coated article in accordance with claim 1 wherein the softening point of the enamel flux is below 600° C.
Claim 4
Dependent Claim
22 words
An enamel coated article in accordance with claim 1 wherein the B 2 O 3 content of the enamel flux is 6-10%.
Claim 5
Dependent Claim
20 words
An enamel coated article in accordance with claim 1 wherein the ZrO 2 content of the enamel flux is 6-8%.
Claim 6
Dependent Claim
63 words
An enamel coated article in accordance with claim 1 wherein the enamel flux consists essentially of 25-35% SiO 2 , 45-55% PbO, at least 80% SiO 2 + PbO, 6-8% ZrO 2 , 6-10% B 2 O 3 , 0.5-1.5% Li 2 O, Na 2 O+ k 2 O not exceeding 2%, CdO not exceeding 4%, and being free of TiO 2 .
Claim 7
Dependent Claim
18 words
An enamel coated article in accordance with claim 1 wherein the body is composed of a borosilicate glass.
Claim 8
Dependent Claim
23 words
An enamel coated article in accordance with claim 1 wherein the body is composed of a glass-ceramic having a predominantly beta-spodumene crystal phase.
Claim 9
Dependent Claim
99 words
An enamel flux consisting essentially of, in percent by weight as calculated from the batch on an oxide basis, 25-40% SiO 2 , 40-60% PbO, at least 75% PbO+ SiO 2 , 3-10% ZrO 2 , 4-12% B 2 O 3 , and 0.2-2.0% Li 2 O, optionally containing up to 2% Na 2 O+ K 2 O and up to 4% CdO, and being free of TiO 2 , said flux having a coefficient of thermal expansion of 48-70× 10 -7 /° C., a softening point below 660° C. and lead and cadmium release values below FDA standards.
Claim 10
Dependent Claim
99 words
An enamel flux consisting essentially of, in percent by weight as calculated from the batch on an oxide basis, 25-40% SiO 2 , 40-60% PbO, at least 75% PbO+ SiO 2 , 3-10% ZrO 2 , 4-12% B 2 O 3 , and 0.2-2.0% Li 2 O, optionally containing up to 2% Na 2 O+ K 2 O and up to 4% CdO, and being free of TiO 2 , said flux having a coefficient of thermal expansion of 48-70× 10 -7 /° C., a softening point below 660° C. and lead and cadmium release values below FDA standards.
Claim 11
Dependent Claim
16 words
An enamel flux in accordance with claim 6 wherein the softening point is below 600° C.
Claim 12
Dependent Claim
17 words
An enamel flux in accordance with claim 6 wherein the B 2 O 3 content is 6-10%.
Claim 13
Dependent Claim
15 words
An enamel flux in accordance with claim 6 wherein the ZrO 2 content is 6-8%.
Claim 14
Dependent Claim
58 words
An enamel flux in accordance with claim 6 consisting essentially of 25-35% SiO 2 , 45-55% PbO, at least 80% PbO+ SiO 2 , 6-8% ZrO 2 , 6-10% B 2 O 3 , 0.5-1.5% Li 2 O, Na 2 O+ K 2 O not exceeding 2%, CdO not exceeding 4% and being free of TiO 2 .
References Cited (Backward Citations)
US4038448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |