US4050947A
Expired / Lapsed
US
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Process for opalizing glass
Assignee: Bullseye Glass Co
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Filing: 1976-03-17
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Granted: 1977-09-27
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Expires: 1996-03-17
Abstract
Abstract This invention relates to the use of AlF3 as an opacifying agent in an opal glass making batch which contains 40 wt. percent or more of container and sheet glass cullett. The batch consists essentially, in weight percent, of 40-85% cullett, 0-25% Na2B4O7.5H2O, 0-12% CaMg(CO3)2, 3-19% SiO2, and an amount of Alf3, which is 10-30% of the weight of the cullett.
Inventors
- 👤 Raymond E. Ahlgren
- 👤 Danial W. Schwoerer
- 👤 Boyce H. Lundstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:41
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/005; C03C1/00; C03C1/002; C03C1/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A glass making batch for the production of a spontaneous opal glass containing essentially, in weight percent, of: 40-85% of a cullett which, in weight percent, contains about 72% SiO 2 , 13% Na 2 O, 12% CaO, and 3% metal oxide selected from the group consisting of aluminum oxides, iron oxides and mixtures thereof; 3-19% SiO 2 ; and an amount of AlF 3 which is 10-30% of the weight of the cullett.
Claim 2
Dependent Claim
74 words
A glass making batch for the production of a spontaneous opal glass containing essentially, in weight percent, of: 40-85% of a cullett which, in weight percent, contains about 72% SiO 2 , 13% Na 2 O, 12% CaO, and 3% metal oxide selected from the group consisting of aluminum oxides, iron oxides and mixtures thereof; 3-19% SiO 2 ; and an amount of AlF 3 which is 10-30% of the weight of the cullett.
Claim 3
Dependent Claim
25 words
The batch of claim 1 which also contains 0-25% Na 2 B 4 O 7 .5H 2 O and 0-12% CaMg(CO 3 ) 2 .
Claim 4
Dependent Claim
36 words
The batch of claim 2 which contains, in weight percent, about 50-75% of said cullett, 15-22% Na 2 B 4 O 7 .5H 2 O, 1-4% CaMg(CO 3 ) 2 , and 6-13% SiO 2 .
Claim 5
Dependent Claim
38 words
The batch of claim 3 which contains, in weight percent, 59% of said cullett, 19% Na 2 B 4 O 7 .5H 2 O, 2% CaMg(CO 3 ) 2 , 9% SiO 2 and 11% AlF 3 .
Claim 6
Dependent Claim
27 words
The batch as set forth in claim 1 which also contains a flux selected from the class consisting of borax, soda ash, potassium nitrate and potassium carbonate.
Claim 7
Dependent Claim
78 words
A glass making batch for the production of a spontaneous opal glass consisting essentially, in weight percent, of: 4- 85% of a cullet which, in weight percent, contains about 72% SiO 2 , 13% Na 2 O, 12% CaO, and 3% metal oxide selected from the group consisting of aluminum oxides, iron oxides and mixtures thereof; 3-19% SiO 2 ; and an amount of AlF 3 sufficient to induce spontaneous opalization of the glass formed from said batch.
Claim 8
Dependent Claim
78 words
A glass making batch for the production of a spontaneous opal glass consisting essentially, in weight percent, of: 4- 85% of a cullet which, in weight percent, contains about 72% SiO 2 , 13% Na 2 O, 12% CaO, and 3% metal oxide selected from the group consisting of aluminum oxides, iron oxides and mixtures thereof; 3-19% SiO 2 ; and an amount of AlF 3 sufficient to induce spontaneous opalization of the glass formed from said batch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |