US3997313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making oxide glasses
Assignee: International Standard Electric Corp
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Filing: 1975-07-16
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Granted: 1976-12-14
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Expires: 1995-07-16
Abstract
Abstract A method for preparing high purity laser and optical fiber glass by the controlled oxidation of metals initially purified by zone refining processes.
Inventors
- 👤 John Henry Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:29
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/225; C03B5/02; C03B5/021; C03B5/06; C03B5/08; C03C; C03C1/00; C03C1/02; C03C3/00; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A method for preparing high purity laser and optical fiber glass comprising the steps of: separately zone refining a plurality of separate metals to obtain a corresponding plurality of high purity metals; heating the high purity metals together in a cooled crucible to obtain a mixture of the high purity metals; introducing an atmosphere of argon and oxygen to the surface of the mixture of the high purity metals to form a protective oxide coating on the surface of the metals; bubbling oxygen through the mixture of the high purity metals to form a corresponding mixture of high purity metal oxides; and heating the mixture of high purity oxides to form the high purity glass.
Claim 2
Independent Claim
115 words
A method for preparing high purity laser and optical fiber glass comprising the steps of: separately zone refining a plurality of separate metals to obtain a corresponding plurality of high purity metals; heating the high purity metals together in a cooled crucible to obtain a mixture of the high purity metals; introducing an atmosphere of argon and oxygen to the surface of the mixture of the high purity metals to form a protective oxide coating on the surface of the metals; bubbling oxygen through the mixture of the high purity metals to form a corresponding mixture of high purity metal oxides; and heating the mixture of high purity oxides to form the high purity glass.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the metals are selected from the group consisting of sodium, calcium, silicon, germanium, aluminum and gallium.
Claim 4
Dependent Claim
49 words
The method of claim 1 wherein the step of heating the oxides comprises heating the metals to a first temperature to melt the metals and to form a glassy layer on the surface of the melt and heating the melt to a second higher temperature to oxidize the metals.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the oxygen is introduced through a porous plug in the crucible containing the pure metals.
Claim 6
Dependent Claim
15 words
The method of claim 3 wherein the first temperature is between 800° and 880° C.
Claim 7
Dependent Claim
15 words
The method of claim 3 wherein the second temperature is between 1300° and 1800° C.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein the oxides comprise 15% Na 2 O, 15% CaO and 70% SiO 2 .
References Cited (Backward Citations)
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US3336159A
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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) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |