Patent US4006490A successfully refreshed from Google Patents.
US4006490A
Expired / Lapsed
US
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Cathode for gunn diode and gunn diode comprising such a cathode
Assignee: Thales SA
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Filing: 1975-11-28
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Granted: 1977-02-01
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Expires: 1995-11-28
Abstract
Abstract A Gunn diode comprises deposited in succession on the active zone of gallium arsenide of type N: a first layer of the same material having the same type of conductivity but very strongly doped, and a second layer of amorphous germanium in which is developed a tunnel effect. A metallic deposit covering this second layer serves as cathode contact.
Inventors
- 👤 Paul-Cyril Moutou
- 👤 Jean-Jacques Godart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:44
CPC Classifications
H; H10; H10N; H10N80/00; H10N80/10; H10N80/107
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
86 words
A cathode for a Gunn diode comprising an active zone formed by Gallium Arsenide of a given type of conductivity, and comprising in combination two layers cooperating with one another, and situated between said active zone and a metallic deposit serving as cathode contact: the first of these layers deposited on said active zone being formed of Gallium Arsenide, having the same type of conductivity as that forming the active zone conductivity and having a strong doping concentration, and said second being formed of amorphous germanium.
Claim 2
Dependent Claim
86 words
A cathode for a Gunn diode comprising an active zone formed by Gallium Arsenide of a given type of conductivity, and comprising in combination two layers cooperating with one another, and situated between said active zone and a metallic deposit serving as cathode contact: the first of these layers deposited on said active zone being formed of Gallium Arsenide, having the same type of conductivity as that forming the active zone conductivity and having a strong doping concentration, and said second being formed of amorphous germanium.
Claim 3
Dependent Claim
23 words
Cathode according to claim 1, the materials forming the active zone and the first layer being respectively of N type and N+ type.
Claim 4
Dependent Claim
32 words
Cathode according to claim 2, the thickness of the first layer is of the order of 2000 A and the thickness of the second layer is in the region of 100 A.
Claim 5
Dependent Claim
14 words
Cathode according to claim 1, wherein the metallic deposit is a deposit of nickel.
References Cited (Backward Citations)
US3600705A
Cited
US3836990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |