US3837831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melting and refining of amber glass
Assignee: OI Glass Inc
•
Filing: 1973-03-14
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Granted: 1974-09-24
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Expires: 1993-03-14
Abstract
Abstract Disclosed is a process for improving the melting and refining characteristics of soda-lime amber glasses containing iron and sulfur as the color-producing ingredients, by substituting copper oxide in the batch in part for the iron or sulfur colorants in a manner to maintain a normal amber color density while decreasing the incidence of gaseous inclusions in the glass.
Inventors
- 👤 R Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:35
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
The process of claim 1 wherein the spectral transmission per one-eighth inch thickness at 550 millimicrons is in the range of about 17 to about 22 percent.
Claim 2
Dependent Claim
29 words
The process of claim 1 further including the steps of sucking a molten gob of the resulting refined amber glass into a mold and forming a glass article therefrom.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the total copper oxide content (as Cu2O) is in the range of about 0.02 to 0.05 percent by weight of the resulting amber glass.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein said amber glass has a composition with the ranges of:
Claim 5
Dependent Claim
30 words
The process of claim 1 wherein the total iron oxide content (as Fe2O3) is in the range of about 0.2 to 0.3 percent by weight of the resulting amber glass.
Claim 6
Dependent Claim
29 words
The process of claim 1 wherein the total sulfur content (as sulfides) is in the range of about 0.01 to 0.035 percent by weight of the resulting amber glass.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |