Patent US4856039A successfully refreshed from Google Patents.
US4856039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray tube having a rotary anode with rhenium-containing bearing surfaces for a gallium-alloy lubricant
Assignee: US Philips Corp
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Filing: 1987-06-02
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Granted: 1989-08-08
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Expires: 2007-06-02
Abstract
Abstract The invention relates to an X-ray tube having a rotary anode which is rotatably supported in a vacuum-tight housing by at least one metal-lubricated sliding bearing of which at least the cooperating bearing surfaces consist of a W-alloy and in which the lubricant is Ga or a Ga-alloy. In order to extend the life of the X-ray tube, in particular at operating temperatures of the bearing above 400° C., a mechanically readily machinable W-alloy is used which comprises from 2 to 27% by weight of Re.
Inventors
- 👤 Cornelius D. Roelandse
- 👤 Pieter Hokkeling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:44
CPC Classifications
F; F16; F16C; F16C17/00; F16C17/10; F16C17/102; F16C17/105; H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/101; H01J35/1017; H01J35/104; F16C2210/00; F16C2210/08; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/109; H01J2235/00; H01J2235/10; H01J2235/1046; H01J2235/106; H01J2235/1066
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
In an X-ray tube having a vacuum-tight housing, a rotary anode, a bearing having a first bearing surface on said rotary anode and a second bearing surface in said housing cooperating with said first bearing surface for rotatably supporting said rotary anode in said housing, and a lubricant disposed between said bearing surfaces comprising Ga for effectively wetting said bearing surfaces and lubricating said bearing, wherein the improvement comprises: said first and second bearing surfaces consisting of an W-alloy having at least 99% by weight of W and Re, and in which the quantity of Re is between 2% and 27% by weight.
Claim 2
Dependent Claim
103 words
In an X-ray tube having a vacuum-tight housing, a rotary anode, a bearing having a first bearing surface on said rotary anode and a second bearing surface in said housing cooperating with said first bearing surface for rotatably supporting said rotary anode in said housing, and a lubricant disposed between said bearing surfaces comprising Ga for effectively wetting said bearing surfaces and lubricating said bearing, wherein the improvement comprises: said first and second bearing surfaces consisting of an W-alloy having at least 99% by weight of W and Re, and in which the quantity of Re is between 2% and 27% by weight.
Claim 3
Dependent Claim
22 words
An X-ray tube as claimed in claim 1, characterized in that the W-alloy comprises from 5 to 10% by weight of Re.
Claim 4
Dependent Claim
48 words
An X-ray tube as claimed in claim 2, characterized in that at least one of the cooperating bearing surfaces of the sliding bearing comprises a pattern of spiral grooves for urging said lubricant into said bearing from opposite directions during bearing operation for rotation of said rotary anode.
Claim 5
Dependent Claim
47 words
An X-ray as claimed in claim 1, characterized in that at least one of the cooperating bearing surfaces of the sliding bearing comprises a pattern of spiral grooves for urging said lubricant into said bearing from opposite directions during bearing operation for rotation of said rotary anode.
References Cited (Backward Citations)
US3694685A
Cited
US4210371A
Cited
US4413356A
Cited
US4276493A
Cited
US4468800A
Cited
US4481655A
Cited
US4562587A
Cited
US4641332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |