US4035685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid cathode cap for an X-ray tube
Assignee: US Philips Corp
•
Filing: 1975-03-28
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Granted: 1977-07-12
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Expires: 1995-03-28
Abstract
Abstract A cathode for an X-ray tube including an emitter and a cap of a ceramic material such as Al 2 O 3 surrounding the emitter and having an open part surrounding an exit portion of the emitted electron beam.
Inventors
- 👤 Heinz-Jurgen Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:06
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/06; H01J35/064
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
A cathode for an X-ray tube comprising means for emitting an electron beam and a cap of ceramic material surrounding said emitting means and having an open part surrounding an exit portion of said beam, the surface of said open part of said cap being provided with a conductive layer, said open part having a step and said conductive layer terminating on said step.
Claim 2
Dependent Claim
64 words
A cathode for an X-ray tube comprising means for emitting an electron beam and a cap of ceramic material surrounding said emitting means and having an open part surrounding an exit portion of said beam, the surface of said open part of said cap being provided with a conductive layer, said open part having a step and said conductive layer terminating on said step.
Claim 3
Dependent Claim
18 words
A cathode as claimed in claim 1, wherein the cap is made of a vacuum-tight aluminum oxide ceramic.
Claim 4
Dependent Claim
55 words
A cathode for an X-ray tube comprising means for emitting an electron beam and a cap of ceramic material surrounding said emitting means and having an open part surrounding an exit portion of said beam, a sleeve for supporting said cap, and a conductive layer provided between facing surface portions of said cap and sleeve.
Claim 5
Dependent Claim
55 words
A cathode for an X-ray tube comprising means for emitting an electron beam and a cap of ceramic material surrounding said emitting means and having an open part surrounding an exit portion of said beam, a sleeve for supporting said cap, and a conductive layer provided between facing surface portions of said cap and sleeve.
Claim 6
Dependent Claim
18 words
A cathode as claimed in claim 3, wherein the cap is made of a vacuum-tight aluminum oxide ceramic.
References Cited (Backward Citations)
US2732512A
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US2310811A
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US2378164A
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US2905841A
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US3646380A
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US3631290A
Cited
US3721847A
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US3906271A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |