US4205251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray tube for the examination of fine structures
Assignee: US Philips Corp
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Filing: 1977-09-20
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Granted: 1980-05-27
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Expires: 1997-09-20
Abstract
Abstract An additive which protects the anode against roughening is included in a surface layer of the anode of an X-ray source for generating X-rays within a comparatively narrow wavelength range. The additive is provided by deposition of material in vacuum, followed by diffusion of the material into the anode body.
Inventors
- 👤 Gerrit Zwep
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:35
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/112
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
An X-ray tube comprising an envelope, an anode and a cathode for generating an electron beam, said anode and said cathode being arranged in said envelope in spaced relationship such that said electron beam strikes a surface portion of said anode to thereby generate X-ray radiation of a predetermined wavelength range, and an additive selected from the group consisting of cobalt, chromium, iron, silver, and mixtures thereof diffused into said surface portion for increasing the heat resistance of said anode without significantly affecting the wavelength range of said X-ray radiation.
Claim 2
Dependent Claim
90 words
An X-ray tube comprising an envelope, an anode and a cathode for generating an electron beam, said anode and said cathode being arranged in said envelope in spaced relationship such that said electron beam strikes a surface portion of said anode to thereby generate X-ray radiation of a predetermined wavelength range, and an additive selected from the group consisting of cobalt, chromium, iron, silver, and mixtures thereof diffused into said surface portion for increasing the heat resistance of said anode without significantly affecting the wavelength range of said X-ray radiation.
Claim 3
Dependent Claim
14 words
The X-ray tube according to claim 1 wherein said anode is made of copper.
Claim 4
Dependent Claim
27 words
The X-ray tube according to claim 1 wherein the layer of said surface portion having said additive contains from 0.005% to 0.5% by weight of said additive.
Claim 5
Dependent Claim
26 words
The X-ray tube according to claim 3 wherein said surface layer with said additive has a thickness of no more than a few tens of micrometers.
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) | 1983-05-27 | 1983-11-26 | 1984-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-27 | 1987-11-26 | 1988-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-27 | 1991-11-26 | 1992-05-27 | $7700.00 | Window Closed / Lapsed |