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US3837828A
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US
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Method of melting laser glass in a noble metal container in a controlled reducing atmosphere
Assignee: Schott Optical Glass Inc
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Filing: 1971-09-01
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Granted: 1974-09-24
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Expires: 1991-09-01
Abstract
Abstract This invention provides methods for melting glass laser compositions to provide glass laser rods with a minimum of noble metal inclusions and a minimum of dissolved noble metal content. The process comprises melting the laser glass in a noble metal container that is preferably platinum in a controlled reducing atmosphere in which the partial pressure of oxygen is between about 10 2 and 10 50 atmospheres.
Inventors
- 👤 E Dietz
- 👤 P Wengert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:24
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/16; C03B5/167; C03B5/1672; C03B5/1675; C03B5/235; C03C; C03C4/00; C03C4/0071
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
21 words
A method as defined in claim 1 in which the laser glass composition comprises the following ingredients in approximate mole percentages:
Claim 2
Dependent Claim
18 words
A method as defined in claim 1 in which the following ingredients are present in approximate mole percent:
Claim 3
Dependent Claim
31 words
A method as defined in claim 1 in which the buffered gas mixture comprises CO2 and and CO, and the laser glass composition comprises the following ingredients in approximate mole percentages:
Claim 4
Dependent Claim
46 words
A method as defined in claim 1 in which the buffered gas mixture comprises about 91 to 94 percent by volume of CO2 and about 6 to 9 percent by volume of CO, and the laser glass composition comprises the following ingredients in approximate mole percentages:
Claim 5
Dependent Claim
17 words
A method as defined in claim 1 in which the glass laser composition comprises the following composition:
Claim 6
Dependent Claim
17 words
A method as defined in claim 1, in which the glass laser composition comprises the following composition:
Claim 7
Dependent Claim
26 words
A method as defined in claim 1 in which the buffered gas mixture comprises CO2 and NH3, and the glass laser composition comprises the following composition:
Claim 8
Dependent Claim
15 words
A method as defined in claim 1 in which the buffered gas mixture is CO2/CO.
Claim 9
Dependent Claim
26 words
A method as defined in claim 1 in which the partial pressure of oxygen is greater than about 10 13 atmospheres at a temperature of 2,600*F.
Claim 10
Dependent Claim
26 words
A method as defined in claim 1 in which the partial pressure of oxygen is greater than about 10 14 at a temperature of about 2,421*F.
Claim 11
Independent Claim
155 words
A method of melting glass laser compositions with a minimum of platinum inclusions and a minimum of dissolved platinum content in the resultant glass laser material, the process comprising melting the laser glass composition in a container having at least 50 percent by weight of platinum in a reducing atmosphere with a buffered gas mixture, the atmosphere having a minimum level of the partial pressure or oxygen that is equivalent to a range of about 10 8.6 to 10 38 atmospheres for a temperature range of about 981*F. to 3,321*F. for a silicate glass; the partial pressure of oxygen of 10 38 atmospheRes being a minimum at the low temperature of about 981*F. and the partial pressure of 10 8.6 being a minimum at the high temperature of about 3,321*F., the minimum level of the partial pressure of oxygen, expressed as log10 PO at the temperature used to melt the glass, being set forth below:
Claim 12
Dependent Claim
18 words
A method as defined in claim 12, in which the glass laser composition comprises the following approximate composition:
Claim 13
Dependent Claim
177 words
In a method of melting a glass laser composition with a minimum of platinum inclusions and a minimum of dissolved platinum content, in which the glass laser composition is melted in a platinum container having at least 50 percent by weight of platinum, the improvement comprising melting laser glass in a reducing atmosphere with a buffered gas mixture of the group consisting of CO2/NH3, CO2/H2O, H2O/H2, H2O/NH3 and CO2/CO, and maintaining and controlling the partial pressure of oxygen at a minimum level which is in a range that is substantially equivalent to a range of about 10 8.6 to 10 38 atmospheres for a range of temperatures from about 981* to 3,321*F. for a silicate, the partial pressure of oxygen of 10 38 atmospheres being the minimum level at the low temperature of about 981*F. and the partial pressure of 10 8.6 being the minimum level at the high temperature of 3,321*F., the minimum level of the partial pressure of oxygen, expressed as log10 PO at the temperature used to melt the glass being set forth below:
Claim 14
Dependent Claim
15 words
A method as defined in claim 12 in which the buffered gas mixture is CO2/CO.
Claim 15
Dependent Claim
15 words
A method as defined in claim 12 in which the buffered gas mixture is CO2/NH3.
Claim 16
Dependent Claim
15 words
A method as defined in claim 12 in which the buffered gas mixture is H2O/H2.
Claim 17
Independent Claim
176 words
A method of melting silicate glass laser compositions with a minimum of platinum inclusions and a minimum of dissolved platinum content in the resultant glass laser material, the process comprising melting laser glass compositions in a platinum metal container with a buffered gas mixture of the group consisting of CO2/NH3, CO2/H2, H2O/H2, H2O/NH3 and CO2/CO in a reducing atmosphere in which the partial pressure of oxygen is no greater than about 10 3 atmospheres, the partial pressure of oxygen being controlled and maintained at a partial pressure that is substantially equivalent to a range of about 10 8.6 to 10 38 for a temperature range of about 981*F. to 3,321*F. for a silicate glass, the partial pressure of oxygen of 10 38 atmospheres being a minimum at the low temperature range of about 981*F. and the partial pressure of 10 8.6 being a minimum at the high temperature of about 3,321*F., the minimum level of the partial pressure of oxygen, expressed as log10 PO at the temperature used to melt the glass being set forth below:
Claim 18
Dependent Claim
23 words
A method as defined in claim 18 in which the partial pressure of oxygen is about 10 8 to 10 12 at 2,600*F.
Claim 19
Dependent Claim
21 words
A method as defined in claim 12 in which the laser glass composition comprises the following ingredients in approximate mole percentages:
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 |