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US4352041A Expired / Lapsed US ⏱️ 0.0 years remaining

Rotary anodes for X-ray tubes

Assignee: US Philips Corp
•
Filing: 1980-07-03
•
Granted: 1982-09-28
•
Expires: 2000-07-03
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Abstract

Abstract An intermediate layer comprising several sub-layers is sandwiched between the support and a target layer of a rotary X-ray anode. The sub-layer of the intermediate layer which contacts the support and the sub-layer of the intermediate layer which contacts the target layer both consist of pure rhenium. Interposed between these two sub-layers is a further sub-layer consisting of a rhenium alloy containing at least one carbide-forming metal, for example tungsten, tantalum or hafnium. This construction of the intermediate layer provides a barrier against carbon diffusion, which barrier has substantially the heat conduction properties of metals and which offers a sufficient protection against the penetration of carbon into the target layer, even at temperaturers above 1500 K.

Inventors

  • 👤 Horst Hubner
  • 👤 Bernhard Lersmacher
  • 👤 Hans Lydtin
  • 👤 Rolf Wilden

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 23:48
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/108; H01J2235/00; H01J2235/08; H01J2235/083; H01J2235/084

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 77 words
A rotary anode for an X-ray tube comprising a carbon support, a heavy metal target layer and a plurality of intermediate layers interposed between the support and the target layer, said intermediate layers including first and second outer layers consisting essentially of rhenium, in contact with the support and the target layer, respectively, and an inner layer consisting essentially of a rhenium alloy containing at least one carbide-forming metal, interposed between the first and second outer layers.
Claim 2
Dependent Claim 77 words
A rotary anode for an X-ray tube comprising a carbon support, a heavy metal target layer and a plurality of intermediate layers interposed between the support and the target layer, said intermediate layers including first and second outer layers consisting essentially of rhenium, in contact with the support and the target layer, respectively, and an inner layer consisting essentially of a rhenium alloy containing at least one carbide-forming metal, interposed between the first and second outer layers.
Claim 3
Dependent Claim 28 words
A rotary anode as claimed in claim 1 characterized in that the alloy of which the inner layer consists contains from 1 to 25 mol.% of carbide-forming metals.
Claim 4
Dependent Claim 37 words
A rotary anode as claimed in claim 2, characterized in that the alloy of which the inner layer consists contains 1 to 25 mol.% tungsten or 1 to 5 mol.% tantalum or 1 to 3 mol.% hafnium.
Claim 5
Dependent Claim 23 words
A rotary anode as claimed in claim 1, 2 or 3, characterized in that the first layer is 1 to 5 μm thick.
Claim 6
Dependent Claim 26 words
A rotary anode as claimed in any of claim 1, 2, 3 or 4, characterized in that the inner layer is 1 to 5 μm thick.
Claim 7
Dependent Claim 26 words
A rotary anode as claimed in any of claim 1, 2, 3 or 5, characterized in that the second layer is 1 to 3 μm thick.

References Cited (Backward Citations)

US2863083A Cited
US3579022A Cited
US3890521A Cited
US4132917A Cited
US4145632A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-09-27 1986-03-29 1986-09-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-09-27 1990-03-29 1990-09-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-09-27 1994-03-29 1994-09-28 $7700.00 Window Closed / Lapsed

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