US3781749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistance thermometer element
Assignee: Johnson Matthey PLC
•
Filing: 1972-11-13
•
Granted: 1973-12-25
•
Expires: 1992-11-13
Abstract
Abstract An electrically resistive element suitable for use as the temperature sensitive element of a resistance thermometer comprising a layer of vitreous material loaded with electrically conducting particles secured to an electrically non-conducting substrate. Preferably the particles are flakes or platelets of platinum. The element includes two tortiles or sinuous paths of the fused vitreous material in side by side relationship and interconnected at one end to form a non-inductive electrically conducting path and in the case of a multilayered structure, electrically interconnected layers of material are separated by intermediate layers of a dielectric material. A dispersion of the particles and powdered vitreous material in an organic medium is screen printed on the substrate and fired to fuse the vitreous material. The two paths may be printed on the substrate or may be cut by laser beam from a single layer printed on the substrate or intermediate layer. The substrate may form part of the surface of a body whose temperature is to be measured, may be a wafer of alumina, or in the case of a monolithic multilayered structure, a layer of the dielectric material from which the intermediate layers are formed.
Inventors
- 👤 G Iles
- 👤 G Selman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:23
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/16; G01K7/18; G01K7/183; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
15 words
An element according to claim 1, wherein the particles comprise flakes or platelets of platinum.
Claim 2
Dependent Claim
15 words
An element according to claim 1, wherein the fused vitreous material comprises lead borosilicate glass.
Claim 3
Dependent Claim
14 words
An element according to claim 3, wherein the substrate comprises a wafer of alumina.
Claim 4
Dependent Claim
25 words
An element according to claim 3 wherein the substrate is part of the surface of the body, the temperature of which is to be measured.
Claim 5
Dependent Claim
17 words
An element according to claim 1, wherein the tortile paths take the general form of a spiral.
Claim 6
Dependent Claim
44 words
An element according to claim 1 comprising a plurality of superimposed layers of the said fused vitreous material, separated by intermediate layers of dielectric material, adjacent layers of the fused vitreous material being interconnected at one end to form a sinuous electrically conducting path.
Claim 7
Dependent Claim
46 words
An element according to claim 7 wherein each of the said plurality of superimposed layers and the interconnection between adjacent layers, are divided into two to form two sinuous electrically conducting paths in side by side relationship, the two paths being electrically interconnected at one end.
Claim 8
Dependent Claim
25 words
An element according to claim 7 wherein the substrate is part of the surface of the body, the temperature of which is to be measured.
Claim 9
Dependent Claim
14 words
An element according to claim 7, wherein the substrate comprises a wafer of alumina.
Claim 10
Dependent Claim
24 words
An element according to claim 7, wherein the substrate comprises a layer of the dielectric material from which the said intermediate layers are formed.
Claim 11
Dependent Claim
26 words
An element according to claim 1 and comprising a land on the other end of each path for providing electrical connection with the electrically conducting paths.
Claim 12
Independent Claim
128 words
A method of making a temperature sensitive device including at least one temperature sensitive element, each temperature sensitive element being made by applying to an electrically non-conducting substrate a layer of a composition consisting essentially of a powdered vitreous material and a powdered electrically conducting material dispersed in an organic medium, the electrically conducting particles being made from a metal selected from the group consisting of gold, silver, the platinum group metals, iron, nickel, cobalt and copper, heating the substrate and the said layer to drive off the organic medium and fuse the glass and, thereafter, removing material from the said layer to form on the substrate two electrically conducting and adjacent tortile paths which are in side by side relationship and interconnected to establish electrical continuity therebetween.
Claim 13
Dependent Claim
15 words
A method according to claim 13, wherein the particles comprise flakes or platelets of platinum.
Claim 14
Dependent Claim
14 words
A method according to claim 13, wherein the vitreous material comprises lead borosilicate glass.
Claim 15
Dependent Claim
13 words
A method according to claim 13, wherein the organic medium comprises ethyl cellulose.
Claim 16
Dependent Claim
55 words
A method according to claim 13 comprising the step of screen printing the said dispersion onto the substrate in the form of two tortile paths in side by side relationship and interconnected at one end. 18, A method according to claim 17, wherein the said tortile paths take the general form of a reentrant spiral.
Claim 17
Dependent Claim
52 words
A method according to claim 13 and comprising screen printing the layer of the said dispersion covering one or more areas of the substrate and cutting the said layer with a laser beam to form two tortile paths in side by side relationship and interconnected at one end of the said paths.
Claim 18
Dependent Claim
105 words
A method according to claim 20 comprising screen printing the layer of the said dispersion onto the substrate, overlaying the said layer with a layer of dielectric material including a window in an end portion thereof, screen printing a further layer of said dispersion over the dielectric layer such that some of the dispersion fills the window thereby connecting together the layers of dispersion and continuing to print alternate layers of dielectric material and said dispersion to build up a stack in which adjacent layers of said dispersion separated by intermediate dielectric layers, and connected together so as to form a sinuous electrically conducting path.
Claim 19
Dependent Claim
67 words
A method according to claim 20, wherein each of the said layers of dispersion comprises two paths in side by side relationship, each path in a layer being connected to a corresponding path in an adjacent layer through a window in an intermediate dielectric layer, thereby forming two sinuous electrically conducting paths in side by side relationship and wherein the two paths are interconnected at one end.
Claim 20
Dependent Claim
31 words
A method according to claim 20, wherein the two paths in a layer are cut by laser beam from a single layer printed on the substrate or an intermediate dielectric layer.
Claim 21
Dependent Claim
21 words
A method according to claim 20, wherein firing of each layer is effected before it is overlaid by a further layer.
Claim 22
Dependent Claim
24 words
A method according to claim 20 wherein the substrate comprises a layer of the dielectric material from which the said intermediate layers are formed.
Claim 23
Dependent Claim
26 words
A method according to claim 23, wherein the dielectric material is in its ''''green'''' state and firing is effected when building of the stack is completed.
Claim 24
Dependent Claim
12 words
A resistance thermometer comprising an electrically resistive element according to claim 1.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |