Patent US3558989A successfully refreshed from Google Patents.
US3558989A
Expired / Lapsed
US
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Semiconductor protective device
Assignee: Lignes Telegraphiques et Telephoniques LTT SA
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Filing: 1968-02-05
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Granted: 1971-01-26
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Expires: 1988-02-05
Abstract
Abstract A fast acting circuit protection device includes a calibrated wire connected in series with a bar of semiconductive material and both components are housed in a vacuum tight casing filled with a controlled atmosphere. The semiconductor which may be silicon or gallium arsenide has a resistivity versus temperature characteristic which is substantially an inverted V-shape in the range from about 0 to 350* C. D R A W I N G
Inventors
- 👤 Guy Dameme
- 👤 Gerard Fourichon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:03
CPC Classifications
H; H01; H01H; H01H85/00; H01H85/02; H01H85/0241; H02; H02H; H02H9/00; H02H9/02; H01H85/0039; H01H85/0047; H01H85/0052
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A nonlinear resistive device for connection in series between a constant voltage source and a load comprising: first means for opposing any current variation from a first preset low current value; second means connected in series with said first means and having a preset time lag for increasing the resistance of said device to an infinite value in response to the flow through said device of a second predetermined high current value; and third means including an airtight gas filled envelope housing said first and second means for quickly establishing thermal equilibrium within said first means under conditions of varying currents through said device.
Claim 2
Dependent Claim
104 words
A nonlinear resistive device for connection in series between a constant voltage source and a load comprising: first means for opposing any current variation from a first preset low current value; second means connected in series with said first means and having a preset time lag for increasing the resistance of said device to an infinite value in response to the flow through said device of a second predetermined high current value; and third means including an airtight gas filled envelope housing said first and second means for quickly establishing thermal equilibrium within said first means under conditions of varying currents through said device.
Claim 3
Dependent Claim
48 words
A nonlinear resistive device according to claim 1 in which said first means is a rod of semiconductor material having a substantially inverted V-shaped resistivity versus temperature characteristic in the 0 to 350* C. range and said second means is a wire of a few microns in diameter.
Claim 4
Dependent Claim
14 words
A nonlinear resistive device according to claim 2 in which said semiconductor is silicon.
Claim 5
Dependent Claim
15 words
A nonlinear resistive device according to claim 2 in which said semiconductor is gallium arsenide.
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |