US3720900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin-film resistance thermometer having low ohmic contact strips
Assignee: Mettler Instrumente AG
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Filing: 1970-06-25
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Granted: 1973-03-13
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Expires: 1990-06-25
Abstract
Abstract Temperature-responsive thin-film resistor of the type including a ribbon of resistive material supported on a base layer, characterized in that the composition and cross-sectional dimensions of said resistive ribbon are such as to produce a positive variation in electrical resistance of at least 5 percent per degree Kelvin at any point within a 10* interval up to 30* Kelvin and further that low ohmic contact strips are provided at the ends of the resistive ribbon. Preferably the resistive material is selected from the group consisting of lead, cadmium, indium, thallium, gold and stabilized Beta -tin.
Inventors
- 👤 Bruning D Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:12
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/183
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
Temperature-responsive resistance means, comprising a base plate (1); a layer of resistive material (4) supported by said base plate, said resistive layer being in the form of a relatively thin ribbon the composition and cross-sectional dimensions of which are selected to produce a positive variation in the electrical resistance of said resistive layer of at least 5 percent per degree at any point within a 10* interval up to 30* Kelvin; and a pair of contact strips (6) attached to said base plate and electrically connected with the ends of said resistive ribbon, respectively, said contact strips having a total resistance value less than approximately one hundredth of the resistance value of said resistive ribbon.
Claim 2
Dependent Claim
115 words
Temperature-responsive resistance means, comprising a base plate (1); a layer of resistive material (4) supported by said base plate, said resistive layer being in the form of a relatively thin ribbon the composition and cross-sectional dimensions of which are selected to produce a positive variation in the electrical resistance of said resistive layer of at least 5 percent per degree at any point within a 10* interval up to 30* Kelvin; and a pair of contact strips (6) attached to said base plate and electrically connected with the ends of said resistive ribbon, respectively, said contact strips having a total resistance value less than approximately one hundredth of the resistance value of said resistive ribbon.
Claim 3
Dependent Claim
28 words
Temperature-responsive resistance means as defined in claim 1, wherein the resistive material is selected from the group consisting of lead, cadmium, indium, thallium, gold and stabilized Beta -tin.
Claim 4
Dependent Claim
24 words
Resistance means as defined in claim 1, and further including a layer of insulating material (3) arranged between said resistive layer and said support.
Claim 5
Dependent Claim
18 words
Resistance means as defined in claim 3, and further including a protective layer (5) covering said resistive layer.
Claim 6
Dependent Claim
22 words
Resistance means as defined in claim 4, wherein said layer of insulating material and said protective layer each consist of silicon monoxide.
Claim 7
Dependent Claim
21 words
Resistance means as defined in claim 1, wherein said layer of resistive material has a thickness of less than 5 microns.
Claim 8
Dependent Claim
22 words
Resistance means as defined in claim 6, wherein said layer of resistive material has a thickness of between 0.1 to 1 micron.
Claim 9
Dependent Claim
35 words
Resistance means as defined in claim 1, wherein the layer of resistive material exhibits at least an 8 percent positive resistance change per degree of temperature in the range of between 10* and 20* Kelvin.
Claim 10
Dependent Claim
41 words
Resistance means as defined in claim 1, and further including a pair of conductors (7), silver paste means (8) electrically connecting said conductors with said strips, respectively, and means (9) physically connecting portions of said conductors, respectively, with said base plate.
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |