US3568125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermistor
Assignee: International Standard Electric Corp
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Filing: 1968-10-14
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Granted: 1971-03-02
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Expires: 1988-10-14
Abstract
Abstract A thermistor is formed of a semiconductor body having a layer of glass on one surface, a metallic resistance layer on the glass and ohmic contacts on the metallic layer and on another surface.
Inventors
- 👤 Claude Marie Villemant
- 👤 Michel Gaultier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:59
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/04; H01C7/041; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49085
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A process for the manufacture of thermistors comprising providing a body of semiconductor material of a predetermined thickness and resistivity, polishing said body, depositing a layer of glass on one surface, heating the glass to fuse to said body, applying a metallic resistance layer on the glass, applying spaced metallic layers to said resistance layer and to another surface to form two sets of ohmic contacts, and securing wires to said contacts.
Claim 2
Dependent Claim
72 words
A process for the manufacture of thermistors comprising providing a body of semiconductor material of a predetermined thickness and resistivity, polishing said body, depositing a layer of glass on one surface, heating the glass to fuse to said body, applying a metallic resistance layer on the glass, applying spaced metallic layers to said resistance layer and to another surface to form two sets of ohmic contacts, and securing wires to said contacts.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said body is made of silicon.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein said body is made of germanium and a layer of silicon oxide is deposited on said one surface before depositing said glass.
Claim 5
Dependent Claim
55 words
The process of claim 1 wherein said metallic resistance layer is formed of nickel-chromium, said spaced metallic layers on said resistance layer being formed of a first layer of nickel and a second layer of gold on said first layer, said spaced metallic layers on said other surface and said wires being formed of gold.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein said glass has a coefficient of expansion similar to that of the semiconductor material.
Claim 7
Dependent Claim
62 words
A thermistor comprising a body of semiconductor material having a predetermined thickness and resistivity, a layer of glass fused to one surface, a metallic resistance layer on said glass, a pair of spaced metallic layer ohmic contacts on said resistance layer, a second pair of spaced metallic layer ohmic contacts on another surface, and pairs of wires respectively secured to said contacts.
Claim 8
Dependent Claim
62 words
A thermistor comprising a body of semiconductor material having a predetermined thickness and resistivity, a layer of glass fused to one surface, a metallic resistance layer on said glass, a pair of spaced metallic layer ohmic contacts on said resistance layer, a second pair of spaced metallic layer ohmic contacts on another surface, and pairs of wires respectively secured to said contacts.
Claim 9
Dependent Claim
11 words
The device of claim 6 wherein said body is of silicon.
Claim 10
Dependent Claim
30 words
The device of claim 6 wherein said body is of germanium and including a layer of silicon oxide on said one surface between said layer of glass and said body.
Claim 11
Dependent Claim
50 words
The device of claim 6 wherein said metallic resistance layer is of nickel-chromium, said ohmic contacts on said resistance layer including a first layer of nickel and a second layer of gold on said first layer, and said ohmic contacts on said other surface and said wires being of gold.
Claim 12
Dependent Claim
19 words
The device of claim 6 wherein said glass has a coefficient of expansion similar to that of the semiconductor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |