US4196367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray tube
Assignee: US Philips Corp
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Filing: 1978-04-13
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Granted: 1980-04-01
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Expires: 1998-04-13
Abstract
Abstract Disclosed is an X-ray tube for fluorescence analysis having an exit aperture which is closed by a window of non-uniform thickness. A thicker window portion is located at the side of the aperture remote from the anode and partly overlaps a thinner window plate. In an analysis apparatus, the thicker window portion is located in a portion of the window through which passes the radiation traversing a comparatively small distance between the anode and the specimen.
Inventors
- 👤 Willem H. Diemer
- 👤 Gerrit Zwep
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:43
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/16; H01J35/18; H01J35/32; H01J2235/00; H01J2235/12; H01J2235/1204; H01J2235/1225; H01J2235/1262; H01J2235/16; H01J2235/165; H01J2235/168
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
An X-ray tube comprising an envelope, a cathode and an anode arranged in said envelope for generating an X-ray beam, said envelope having an exit aperture for passing said beam and a window mounted in said aperture, said window having non-uniform transmissivity to X-rays such that the transmissivity of a first portion of said window disposed in the path of X-rays which traverse the shortest distance between said anode and an object to be examined is lower than the transmissivity of a second portion of said window disposed in the path of x-rays which traverse the longest distance between said anode and said object so that the X-ray radiation incident on said object is of generally uniform intensity.
Claim 2
Dependent Claim
118 words
An X-ray tube comprising an envelope, a cathode and an anode arranged in said envelope for generating an X-ray beam, said envelope having an exit aperture for passing said beam and a window mounted in said aperture, said window having non-uniform transmissivity to X-rays such that the transmissivity of a first portion of said window disposed in the path of X-rays which traverse the shortest distance between said anode and an object to be examined is lower than the transmissivity of a second portion of said window disposed in the path of x-rays which traverse the longest distance between said anode and said object so that the X-ray radiation incident on said object is of generally uniform intensity.
Claim 3
Dependent Claim
21 words
The X-ray tube according to claim 1 including a shielding sleeve containing ferromagnetic material arranged between said cathode and said anode.
Claim 4
Dependent Claim
16 words
The X-ray tube according to claim 1 wherein said cathode is an indirectly heated storage cathode.
Claim 5
Dependent Claim
50 words
The X-ray tube according to claim 1 wherein said window comprises a plate disposed in said aperture and secured to said envelope in a vacuum-tight manner, said plate having a thicker portion defining said first portion of lower transmissivity and a thinner portion defining said second portion of higher transmissivity.
Claim 6
Dependent Claim
71 words
The X-ray tube according to claim 1 wherein said window comprises a first plate disposed in said aperture and secured to said envelope and a second plate of a surface area smaller than that of said first plate supported in said envelope in a superposed relationship with a portion of said first plate, said second plate and said last-named portion defining said first portion of said window having said lower transmissivity.
Claim 7
Dependent Claim
124 words
An X-ray tube comprising an envelope, a cathode and an anode arranged in a spaced apart relationship in said envelope such that electrons emitted by said cathode strike said anode to thereby generate a beam of X-rays, said envelope having an exit aperture for passing said beam to a region exterior of said envelope and a window arranged in said aperture, said window including a first plate disposed in said aperture and secured in a vacuum-tight manner to said envelope and a second plate of a surface area smaller than that of said first plate disposed adjacent said first plate and extending over a portion thereof nearest to the center of the area of said anode struck by said electrons emitted from said cathode.
Claim 8
Dependent Claim
124 words
An X-ray tube comprising an envelope, a cathode and an anode arranged in a spaced apart relationship in said envelope such that electrons emitted by said cathode strike said anode to thereby generate a beam of X-rays, said envelope having an exit aperture for passing said beam to a region exterior of said envelope and a window arranged in said aperture, said window including a first plate disposed in said aperture and secured in a vacuum-tight manner to said envelope and a second plate of a surface area smaller than that of said first plate disposed adjacent said first plate and extending over a portion thereof nearest to the center of the area of said anode struck by said electrons emitted from said cathode.
Claim 9
Dependent Claim
20 words
The X-ray tube according to claim 6 wherein said second plate is disposed between said anode and said first plate.
Claim 10
Dependent Claim
17 words
The X-ray tube according to claim 7 wherein said first and second plates are made of beryllium.
Claim 11
Dependent Claim
21 words
The X-ray tube according to claim 8 wherein said first plate is a circular disc and said second plate is semi-circular.
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) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |