US3872418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical relay device
Assignee: Multi State Devices Ltd
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Filing: 1974-01-07
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Granted: 1975-03-18
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Expires: 1994-01-07
Abstract
Abstract An electrical relay device comprises a first substrate of thermal insulative material mounted on a suitable heat conductive support, a heater film deposited on such first substrate, first electrical contacts mounted on the first substrate and connected to the heater film for connecting the heater film to a source of control voltage, a second substrate having a mass smaller than the first ssubstrate mounted on top of the heater film, a thin film of a sensing material showing a large change of impedance at a critical temperature deposited over the second substrate, and second electrical contacts on the second substrate and connected to the film of sensing material for connecting it to the terminals of a controlled circuit. The material of the second substrate is selected so as to optimize the sensing material properties or the relay performance properties.
Inventors
- 👤 Charles T Plough
- 👤 H Keith Eastwood
- 👤 Marcus Arts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:25
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/042; H01C7/043; H01C7/047; H10; H10W; H10W72/00; H10W72/50; H10W72/531; H10W72/536; H10W72/5363; H10W72/851; H10W72/874; H10W72/884; H10W90/00; H10W90/701; H10W90/731; H10W90/732
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
An electrical relay device comprising: a. a first substrate of thermal insulative material mounted on a suitable heat conductive support; b. a heater film deposited on said first substrate; c. first electrical contacts mounted on said first substrate and connected to said heater film for connecting said heater film to a source of control voltage; d. a second substrate having a mass smaller than said first substrate mounted on top of said heater film; e. a thin film of a sensing material exhibiting a large change of impedance at a critical temperature deposited on said substrate, said second substrate being made of a single crystal material selected to optimize the electrical properties of the sensing material deposited thereon; and f. second electrical contacts mounted on said second substrate and connected to said thin film of sensing material for connecting it to the terminals of a control circuit.
Claim 2
Dependent Claim
147 words
An electrical relay device comprising: a. a first substrate of thermal insulative material mounted on a suitable heat conductive support; b. a heater film deposited on said first substrate; c. first electrical contacts mounted on said first substrate and connected to said heater film for connecting said heater film to a source of control voltage; d. a second substrate having a mass smaller than said first substrate mounted on top of said heater film; e. a thin film of a sensing material exhibiting a large change of impedance at a critical temperature deposited on said substrate, said second substrate being made of a single crystal material selected to optimize the electrical properties of the sensing material deposited thereon; and f. second electrical contacts mounted on said second substrate and connected to said thin film of sensing material for connecting it to the terminals of a control circuit.
Claim 3
Dependent Claim
36 words
An electrical relay device as defined in claim 1, wherein the mass of said second substrate is reduced to the minimum required to support the sensing material so as to increase switching speed of the relay.
Claim 4
Dependent Claim
29 words
An electrical relay device as defined in claim 1, wherein said second substrate is secured to said heater film by means of an adhesive material which is electrically insulative.
Claim 5
Dependent Claim
24 words
An electrical relay device as defined in claim 3, wherein said first substrate is secured to said support by means of an adhesive material.
Claim 6
Dependent Claim
23 words
An eleCtrical relay device as defined in claim 1, wherein said heater film has substantially the same surface area as the second substrate.
Claim 7
Dependent Claim
45 words
An electrical relay device as defined in claim 1, wherein two sensor films are formed on the second substrate and spaced so that the heater film may provide the proper heat ratio to the two sensor films for ensuring temperature compensation to the electrical relay.
Claim 8
Dependent Claim
28 words
An electrical relay device as defined in claim 1, wherein the sensor film is selected from the group consisting of vanadium dioxide, doped vanadium oxide, V2O3 and V3O5.
Claim 9
Dependent Claim
35 words
An electrical relay device as defined in claim 1, wherein the second substrate is single crystal sapphire and the sensing material is selected from the group consisting of vanadium dioxide, doped vanadium dioxide and V2O3.
Claim 10
Dependent Claim
23 words
An electrical relay device as defined in claim 1, wherein the second substrate is single crystal quartz and the sensing material is V3O5.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |