US3786390A
Expired / Lapsed
US
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Temperature measuring resistance
Assignee: Schott AG
•
Filing: 1972-08-08
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Granted: 1974-01-15
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Expires: 1992-08-08
Abstract
Abstract A temperature measuring resistance employing a composition whose electrical resistance varies with temperature. The composition is preferably a glass containing Al2O3, LiO2 and SiO2.
Inventors
- 👤 K Kristen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:45
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
39 words
The resistance of claim 1 wherein the composition comprises the following compounds in the following percentages by weight: Compound Weight Percent Al2O3 14 to 32 Li2O 1 to 6 TiO2 0.5 to 6 ZrO2 0.5 to 5 SiO2 balance
Claim 2
Dependent Claim
23 words
A temperature-measuring resistance according to claim 1, characterized in that the composition consists of a glass ceramic with a high negative temperature coefficient.
Claim 3
Dependent Claim
28 words
A temperature-measuring resistance according to claim 1 characterized in that the glass ceramic of the resistance material has a thermal expansion coefficient smaller than 30 X 10 7/*C.
Claim 4
Dependent Claim
22 words
A temperature-measuring resistance according to claim 1 characterized in that a glass ceramic article shows certain measuring ranges due to defining contacts.
Claim 5
Independent Claim
43 words
A method of measuring temperature by passing a current through a composition whose electrical resistance varies with temperature, said composition comprising the following compounds in the following percentages by weight: Compound Weight Percent Al2O3 14 to 32 Li2O 1 to 6 SiO2 balance
Claim 6
Dependent Claim
39 words
The method of claim 6 wherein the composition comprises the following compounds in the following percentages by weight: Compound Weight Percent Al2O3 14 to 32 Li2O 1 to 6 TiO2 0.5 to 6 ZrO2 0.5 to 5 SiO2 balance.
References Cited (Backward Citations)
US3162831A
Cited
US3216808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |