US4331023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition and measurement of gases dissolved in molten metals
Assignee: PPG Industries Ohio Inc
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Filing: 1980-03-10
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Granted: 1982-05-25
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Expires: 2000-03-10
Abstract
Abstract Method and apparatus for measuring gases dissolved in molten metal. Also disclosed are method and apparatus for dissolving gases in molten metal and a method of forming a gas permeable but molten metal impervious ceramic tube. A ceramic member is leached by an invention process so as to be selectively gas permeable. The member is inserted into molten metal to submerge the permeable portion. Then a vacuum is applied to the member and dissolved gases are measured by the change in pressure caused by gases entering from the molten metal. In another embodiment gas is applied to the submerged member to cause it to dissolve in the molten metal.
Inventors
- 👤 Ties Allersma
- 👤 James E. Simpson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:41
CPC Classifications
G; G01; G01F; G01F13/00; G01N; G01N33/00; G01N33/20; G01N33/202; G01N33/2022; G01N33/2025; G01N7/00; G01N7/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
130 words
A method of measuring the amount of at least one gas dissolved in a liquid comprising the steps of: providing a probe having a unitary outer wall to define a passageway within the probe, the outer wall has a portion to be submerged in the liquid which portion is substantially permeable with respect to the at least one gas but substantially impermeable to the liquid containing the at least one gas and has the remaining wall portion substantially impermeable with respect to both the at least one gas and liquid; submerging at least the permeable outer wall portion of the probe in the liquid having the at least one gas; and measuring gas pressure in the probe to monitor gas passing through the permeable outer wall portion of the probe.
Claim 2
Independent Claim
130 words
A method of measuring the amount of at least one gas dissolved in a liquid comprising the steps of: providing a probe having a unitary outer wall to define a passageway within the probe, the outer wall has a portion to be submerged in the liquid which portion is substantially permeable with respect to the at least one gas but substantially impermeable to the liquid containing the at least one gas and has the remaining wall portion substantially impermeable with respect to both the at least one gas and liquid; submerging at least the permeable outer wall portion of the probe in the liquid having the at least one gas; and measuring gas pressure in the probe to monitor gas passing through the permeable outer wall portion of the probe.
Claim 3
Dependent Claim
44 words
The method as set forth in claim 1 wherein said measuring step includes the steps of: subjecting the passageway within the probe to a vacuum; and monitoring change in gas pressure caused by the at least one gas entering the passageway from the liquid.
Claim 4
Dependent Claim
19 words
The method as set forth in claim 2 wherein said subjecting step is practiced prior to said monitoring step.
Claim 5
Dependent Claim
15 words
The method as set forth in claim 2 wherein said probe comprises a ceramic material.
Claim 6
Dependent Claim
16 words
The method as set forth in claim 1 wherein the liquid is molten metal comprising tin.
Claim 7
Dependent Claim
21 words
The method as set forth in claim 5 wherein the molten metal forms metal bath in a chamber for glass formation.
Claim 8
Dependent Claim
30 words
The method as set forth in claim 6 wherein said submerging step includes the step of inserting the probe through side of the glass-forming chamber into the molten metal bath.
Claim 9
Dependent Claim
18 words
The method as set forth in claim 1 or 6 wherein the at least one gas is hydrogen.
Claim 10
Dependent Claim
18 words
The method as set forth in claim 1 wherein said measuring step is accomplished by measuring partial pressure.
Claim 11
Dependent Claim
51 words
The method as set forth in claim 1 wherein the outer wall portion impermeable with respect to both the at least one gas and liquid comprises mullite and glassy material and the outer wall portion permeable with respect to the at least one gas but impermeable to the liquid comprises mullite.
Claim 12
Dependent Claim
27 words
The method as set forth in claim 10 wherein the mullite and glassy material is about 80 weight percent mullite and about 20 weight percent silica dioxide.
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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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |