US4088023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level gauge
Assignee: Corning Glass Works
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Filing: 1976-01-16
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Granted: 1978-05-09
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Expires: 1996-01-16
Abstract
Abstract A gauge for exhibiting the liquid level in a container of alkaline liquid, for example a boiler or radiator gauge, is disclosed. The gauge includes a glass component composed at least in part of a glass consisting essentially of 20-50% SiO 2 , 3-40% Y 2 O 3 , 5-25% of a divalent metal oxide and 0-30% Al 2 O 3 . Other features of the invention include use of an yttrium concentrate in producing the glass and a composite glass component wherein only a facing portion is composed of the yttrium glass.
Inventors
- 👤 Albert J. Berleue
- 👤 William H. Dumbaugh, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:10
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/02; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/076; C03C3/095
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
In a gauge for exhibiting the liquid level in a container of alkaline liquid, the improvement which comprises including in said gauge a glass component that is exposed to the alkaline liquid, which glass, when treated in a 5% by weight NaOH solution at 95° C. for six hours, demonstrates essentially no change in appearance and a weight loss of no more than about 0.03 mg/cm 2 , said glass component consisting essentially, in percent by weight on an oxide basis, of 20-50% SiO 2 , 3-40% Y 2 O 3 , 5-25% of a divalent metal oxide selected from the group consisting of the alkaline earth metal oxides and ZnO, and 0-30% Al 2 O 3 .
Claim 2
Dependent Claim
118 words
In a gauge for exhibiting the liquid level in a container of alkaline liquid, the improvement which comprises including in said gauge a glass component that is exposed to the alkaline liquid, which glass, when treated in a 5% by weight NaOH solution at 95° C. for six hours, demonstrates essentially no change in appearance and a weight loss of no more than about 0.03 mg/cm 2 , said glass component consisting essentially, in percent by weight on an oxide basis, of 20-50% SiO 2 , 3-40% Y 2 O 3 , 5-25% of a divalent metal oxide selected from the group consisting of the alkaline earth metal oxides and ZnO, and 0-30% Al 2 O 3 .
Claim 3
Dependent Claim
15 words
A gauge in accordance with claim 1 wherein the alkaline earth metal oxide is magnesia.
Claim 4
Dependent Claim
17 words
A gauge in accordance with claim 1 wherein the glass composition includes at least one lanthanide oxide.
Claim 5
Dependent Claim
13 words
A gauge in accordance with claim 3 wherein the lanthanide oxide is lanthana.
Claim 6
Dependent Claim
82 words
A gauge in accordance with claim 1 wherein the glass component consists of a facing of a glass consisting essentially, in percent by weight on an oxide basis, of 20-50% SiO 2 , 3-40% Y 2 O 3 , 5-25% of a divalent metal oxide selected from the group consisting of the alkaline earth metal oxides and ZnO, and 0-30% Al 2 O 3 , and a backing of a glass having a different composition but a compatible coefficient of thermal expansion.
Claim 7
Dependent Claim
15 words
A gauge in accordance with claim 5 wherein the alkaline earth metal oxide is magnesia.
Claim 8
Dependent Claim
18 words
A gauge in accordance with claim 5 wherein the facing glass composition includes at least one lanthanide oxide.
Claim 9
Dependent Claim
13 words
A gauge in accordance with claim 7 wherein the lanthanide oxide is lanthana.
References Cited (Backward Citations)
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US2071411A
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US2942469A
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US3148543A
Cited
US3573078A
Cited
US3804646A
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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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |