Patent US4612292A successfully refreshed from Google Patents.
US4612292A
Expired / Lapsed
US
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Lead/alkaline earth metal silicates and vitrescible compositions comprised thereof
Assignee: Rhone Poulenc Industries SA
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Filing: 1983-01-10
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Granted: 1986-09-16
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Expires: 2003-01-10
Abstract
Abstract SiO 2 /MeO metallic silicates, wherein Me is lead or an alkaline earth metal, have a molar ratio of SiO 2 to MeO of greater than 2, and same are well suited as pigments, fillers, and especially as glass-formers.
Inventors
- 👤 Christian Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:45
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C01; C01B; C01B33/00; C01B33/20; C01B33/24; C03C3/076; C03C3/102
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
155 words
A process for the preparation of glass, comprising melting, fining in the absence of any fining aid and shaping into glass a glass-forming composition comprising an amorphous SiO 2 /MeO metallic silicate, said metal Me being selected from the group consisting of lead, calcium, barium and zinc, said silicate being essentially devoid of metallic impurities and comprising the oxides SiO 2 and MeO in a molar ratio SiO 2 /MeO of greater than 2, said metallic silicate being prepared according to the method comprising reacting an aqueous solution of an alkali metal silicate with an aqueous solution of a water soluble Me salt, the alkali metal oxide comprising the alkali metal silicate substituted by an Me oxide, the molar ratio of SiO 2 to MeO in the reaction product corresponding to the molar ratio of SiO 2 to alkali metal oxide in the starting material alkali metal silicate, and recovering and drying said metallic silicate.
Claim 2
Dependent Claim
155 words
A process for the preparation of glass, comprising melting, fining in the absence of any fining aid and shaping into glass a glass-forming composition comprising an amorphous SiO 2 /MeO metallic silicate, said metal Me being selected from the group consisting of lead, calcium, barium and zinc, said silicate being essentially devoid of metallic impurities and comprising the oxides SiO 2 and MeO in a molar ratio SiO 2 /MeO of greater than 2, said metallic silicate being prepared according to the method comprising reacting an aqueous solution of an alkali metal silicate with an aqueous solution of a water soluble Me salt, the alkali metal oxide comprising the alkali metal silicate substituted by an Me oxide, the molar ratio of SiO 2 to MeO in the reaction product corresponding to the molar ratio of SiO 2 to alkali metal oxide in the starting material alkali metal silicate, and recovering and drying said metallic silicate.
Claim 3
Dependent Claim
9 words
The process of claim 1 wherein Me is lead.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein Me is selected from the group consisting of calcium, barium and zinc.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the molar ratio of SiO 2 /MeO is between 3 and 5.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the metallic silicate is essentially isotropic.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein said glass-forming composition further comprises a flux.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein said glass-forming composition further comprises a glass modifier.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein said glass-forming composition further comprises an alkali metal silicate.
Claim 10
Dependent Claim
24 words
The process of claim 8 wherein said alkali metal silicate is selected from the group consisting of sodium silicate, potassium silicate and mixtures thereof.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein said glass-forming composition further comprises sodium hydroxide.
Claim 12
Dependent Claim
22 words
The process of claim 1 wherein said glass-forming composition comprises lead silicates, potassium silicate, sodium silicate, sodium nitrate, and anhydrous sodium carbonate.
Claim 13
Dependent Claim
36 words
The process of claim 1 wherein said glass-forming composition further comprises a member selected from the group consisting of ferrous silicate, ferric silicate, cobalt silicate, nickel silicate, copper silicate, selenium silicate and a rare earth silicate.
Claim 14
Dependent Claim
14 words
The process of claim 1 wherein said Me salt is employed in stoichiometric excess.
Claim 15
Dependent Claim
13 words
The process of claim 1 wherein said metallic silicate is precipitated from solution.
Claim 16
Dependent Claim
17 words
The process of claim 1 wherein said alkali metal silicate is added incrementally to the Me salt.
Claim 17
Dependent Claim
12 words
The process of claim 1 wherein said lead salt is lead nitrate.
Claim 18
Dependent Claim
22 words
The process of claim 16 wherein said lead nitrate is prepared in situ via the action of nitric acid on metallic lead.
Claim 19
Dependent Claim
25 words
The process of claim 1 wherein said oxides SiO 2 and MeO are present in a molar ratio SiO 2 /MeO of greater than 3.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
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