US4038576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photocathode support of corundum with layer of barium boroaluminate or calcium boroaluminate glass
Assignee: US Philips Corp
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Filing: 1976-01-26
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Granted: 1977-07-26
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Expires: 1996-01-26
Abstract
Abstract A window for an electron tube formed by a semiconductor device having a support of monocrystalline oxide, by a connection layer formed by a barium- or calcium-boroaluminate, by at least one passivating layer, and by an active layer having a constant composition and formed by a semiconductor material of the p-conductivity type.
Inventors
- 👤 Jean Philippe Hallais
- 👤 Michel Jean-Claude Monnier
- 👤 Jean-Claude Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:41
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/86; H01J29/863; H01J9/00; H01J9/02; H01J9/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
In an electron tube having a photocathode for the near infra-red of the III-V type of the p-conductivity type, a window consisting of an oxidic monocrystalline body of corundum on which the photocathode is secured by a glass which is pervious in the relevant wavelength range and is chemically resistant, said glass being selected from barium boroaluminate and calcium boroaluminate having the composition 15-35% CaO, or BaO, 45-70% B 2 O 3 and 10-20% Al 2 O 3 .
Claim 2
Dependent Claim
79 words
In an electron tube having a photocathode for the near infra-red of the III-V type of the p-conductivity type, a window consisting of an oxidic monocrystalline body of corundum on which the photocathode is secured by a glass which is pervious in the relevant wavelength range and is chemically resistant, said glass being selected from barium boroaluminate and calcium boroaluminate having the composition 15-35% CaO, or BaO, 45-70% B 2 O 3 and 10-20% Al 2 O 3 .
Claim 3
Dependent Claim
28 words
An electron tube as claimed in claim 1, wherein the window has a flat or cylindrical metal edge from which electric contacts extend up to the connection glass.
Claim 4
Dependent Claim
13 words
An electron tube as claimed in which the photocathode is (Ga, In) As.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |