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US4892847A
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Lead-free glass frit compositions
Assignee: BASF Corp
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Filing: 1988-06-13
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Granted: 1990-01-09
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Expires: 2008-06-13
Abstract
Abstract Lead-free glass frit compositions for use in vitreous coatings consisting essentially of SiO 2 -Bi 2 O 3 -B 2 O 3 -alkali metal oxide-ZrO 2 /TiO 2 in appropriate concentrations.
Inventors
- 👤 Barry P. Reinherz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:34
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/02; C03C3/00; C03C3/04; C03C3/062; C03C3/064
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A lead-free glass frit composition consisting essentially of the following components in the indicated weight percent amounts: SiO 2 : 25-35 Bi 2 O 3 : 25-43 B 2 O 3 : 12-25 alkali metal oxide: 4-19 ZrO 2 : 0-3 TiO 2 : 0-5 ZnO: 0-6 CaO: 0-4 SrO: 0-15 BaO: 0-19 Al 2 O 3 : 0-4 NO 2 : 0-10 WO 3 : 0-1 Ce 2 O 3 : 0-1.5 Cr 2 O 3 : 0-7 CoO: 0-15 MnO: 0-8 P 2 O 5 : 0-10 with the amount of ZrO 2 +TiO 2 being 0.3-8.
Claim 2
Dependent Claim
99 words
A lead-free glass frit composition consisting essentially of the following components in the indicated weight percent amounts: SiO 2 : 25-35 Bi 2 O 3 : 25-43 B 2 O 3 : 12-25 alkali metal oxide: 4-19 ZrO 2 : 0-3 TiO 2 : 0-5 ZnO: 0-6 CaO: 0-4 SrO: 0-15 BaO: 0-19 Al 2 O 3 : 0-4 NO 2 : 0-10 WO 3 : 0-1 Ce 2 O 3 : 0-1.5 Cr 2 O 3 : 0-7 CoO: 0-15 MnO: 0-8 P 2 O 5 : 0-10 with the amount of ZrO 2 +TiO 2 being 0.3-8.
Claim 3
Dependent Claim
43 words
The composition of claim 1 wherein the indicated components are present in the indicated weight percent amounts: SiO 2 : 28-31 Bi 2 O 3 : 40-43 B 2 O 3 : 12-15 alkali metal oxide: 5.5-7.5 ZrO 2 +TiO 2 : 0.5-2
Claim 4
Dependent Claim
57 words
The composition of claim 1, wherein the alkali metal oxide is selected from the group consisting of sodium, potassium and lithium oxides and the individual components when present in the composition are present in a maximum concentration of 3.0 weight % Li 2 O, 15.0 weight % K 2 O and 19.0 weight % Na 2 O.
Claim 5
Dependent Claim
21 words
The composition of claim 1, wherein Na 2 O is at least 50%, by weight, of the alkali metal oxide concentration.
Claim 6
Dependent Claim
14 words
The composition of claim 1, wherein both ZrO 2 and TiO 2 are present.
Claim 7
Dependent Claim
47 words
The composition of claim 1 consisting essentially of the following components in the indicated weight percent amounts: SiO 2 : 30.60 Bi 2 O 3 : 41.88 B 2 O 3 : 13.72 Na 2 O: 6.35 ZnO: 2.99 ZrO 2 : 1.42 NO 2 : 3.04
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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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |